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1059 lines
40 KiB
Text
1059 lines
40 KiB
Text
The Linux SYM-2 driver documentation file
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Written by Gerard Roudier <groudier@free.fr>
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21 Rue Carnot
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95170 DEUIL LA BARRE - FRANCE
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Updated by Matthew Wilcox <matthew@wil.cx>
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2004-10-09
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===============================================================================
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1. Introduction
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2. Supported chips and SCSI features
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3. Advantages of this driver for newer chips.
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3.1 Optimized SCSI SCRIPTS
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3.2 New features appeared with the SYM53C896
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4. Memory mapped I/O versus normal I/O
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5. Tagged command queueing
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6. Parity checking
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7. Profiling information
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8. Control commands
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8.1 Set minimum synchronous period
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8.2 Set wide size
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8.3 Set maximum number of concurrent tagged commands
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8.4 Set debug mode
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8.5 Set flag (no_disc)
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8.6 Set verbose level
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8.7 Reset all logical units of a target
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8.8 Abort all tasks of all logical units of a target
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9. Configuration parameters
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10. Boot setup commands
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10.1 Syntax
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10.2 Available arguments
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10.2.1 Default number of tagged commands
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10.2.2 Burst max
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10.2.3 LED support
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10.2.4 Differential mode
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10.2.5 IRQ mode
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10.2.6 Check SCSI BUS
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10.2.7 Suggest a default SCSI id for hosts
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10.2.8 Verbosity level
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10.2.9 Debug mode
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10.2.10 Settle delay
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10.2.11 Serial NVRAM
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10.2.12 Exclude a host from being attached
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10.3 Converting from old options
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10.4 SCSI BUS checking boot option
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11. SCSI problem troubleshooting
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15.1 Problem tracking
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15.2 Understanding hardware error reports
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12. Serial NVRAM support (by Richard Waltham)
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17.1 Features
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17.2 Symbios NVRAM layout
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17.3 Tekram NVRAM layout
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===============================================================================
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1. Introduction
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This driver supports the whole SYM53C8XX family of PCI-SCSI controllers.
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It also support the subset of LSI53C10XX PCI-SCSI controllers that are based
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on the SYM53C8XX SCRIPTS language.
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It replaces the sym53c8xx+ncr53c8xx driver bundle and shares its core code
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with the FreeBSD SYM-2 driver. The `glue' that allows this driver to work
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under Linux is contained in 2 files named sym_glue.h and sym_glue.c.
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Other drivers files are intended not to depend on the Operating System
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on which the driver is used.
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The history of this driver can be summerized as follows:
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1993: ncr driver written for 386bsd and FreeBSD by:
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Wolfgang Stanglmeier <wolf@cologne.de>
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Stefan Esser <se@mi.Uni-Koeln.de>
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1996: port of the ncr driver to Linux-1.2.13 and rename it ncr53c8xx.
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Gerard Roudier
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1998: new sym53c8xx driver for Linux based on LOAD/STORE instruction and that
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adds full support for the 896 but drops support for early NCR devices.
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Gerard Roudier
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1999: port of the sym53c8xx driver to FreeBSD and support for the LSI53C1010
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33 MHz and 66MHz Ultra-3 controllers. The new driver is named `sym'.
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Gerard Roudier
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2000: Add support for early NCR devices to FreeBSD `sym' driver.
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Break the driver into several sources and separate the OS glue
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code from the core code that can be shared among different O/Ses.
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Write a glue code for Linux.
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Gerard Roudier
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2004: Remove FreeBSD compatibility code. Remove support for versions of
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Linux before 2.6. Start using Linux facilities.
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This README file addresses the Linux version of the driver. Under FreeBSD,
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the driver documentation is the sym.8 man page.
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Information about new chips is available at LSILOGIC web server:
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http://www.lsilogic.com/
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SCSI standard documentations are available at T10 site:
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http://www.t10.org/
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Useful SCSI tools written by Eric Youngdale are part of most Linux
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distributions:
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scsiinfo: command line tool
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scsi-config: TCL/Tk tool using scsiinfo
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2. Supported chips and SCSI features
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The following features are supported for all chips:
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Synchronous negotiation
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Disconnection
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Tagged command queuing
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SCSI parity checking
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PCI Master parity checking
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Other features depends on chip capabilities.
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The driver notably uses optimized SCRIPTS for devices that support
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LOAD/STORE and handles PHASE MISMATCH from SCRIPTS for devices that
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support the corresponding feature.
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The following table shows some characteristics of the chip family.
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On board LOAD/STORE HARDWARE
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Chip SDMS BIOS Wide SCSI std. Max. sync SCRIPTS PHASE MISMATCH
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---- --------- ---- --------- ---------- ---------- --------------
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810 N N FAST10 10 MB/s N N
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810A N N FAST10 10 MB/s Y N
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815 Y N FAST10 10 MB/s N N
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825 Y Y FAST10 20 MB/s N N
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825A Y Y FAST10 20 MB/s Y N
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860 N N FAST20 20 MB/s Y N
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875 Y Y FAST20 40 MB/s Y N
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875A Y Y FAST20 40 MB/s Y Y
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876 Y Y FAST20 40 MB/s Y N
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895 Y Y FAST40 80 MB/s Y N
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895A Y Y FAST40 80 MB/s Y Y
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896 Y Y FAST40 80 MB/s Y Y
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897 Y Y FAST40 80 MB/s Y Y
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1510D Y Y FAST40 80 MB/s Y Y
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1010 Y Y FAST80 160 MB/s Y Y
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1010_66* Y Y FAST80 160 MB/s Y Y
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* Chip supports 33MHz and 66MHz PCI bus clock.
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Summary of other supported features:
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Module: allow to load the driver
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Memory mapped I/O: increases performance
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Control commands: write operations to the proc SCSI file system
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Debugging information: written to syslog (expert only)
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Scatter / gather
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Shared interrupt
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Boot setup commands
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Serial NVRAM: Symbios and Tekram formats
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3. Advantages of this driver for newer chips.
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3.1 Optimized SCSI SCRIPTS.
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All chips except the 810, 815 and 825, support new SCSI SCRIPTS instructions
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named LOAD and STORE that allow to move up to 1 DWORD from/to an IO register
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to/from memory much faster that the MOVE MEMORY instruction that is supported
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by the 53c7xx and 53c8xx family.
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The LOAD/STORE instructions support absolute and DSA relative addressing
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modes. The SCSI SCRIPTS had been entirely rewritten using LOAD/STORE instead
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of MOVE MEMORY instructions.
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Due to the lack of LOAD/STORE SCRIPTS instructions by earlier chips, this
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driver also incorporates a different SCRIPTS set based on MEMORY MOVE, in
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order to provide support for the entire SYM53C8XX chips family.
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3.2 New features appeared with the SYM53C896
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Newer chips (see above) allows handling of the phase mismatch context from
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SCRIPTS (avoids the phase mismatch interrupt that stops the SCSI processor
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until the C code has saved the context of the transfer).
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The 896 and 1010 chips support 64 bit PCI transactions and addressing,
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while the 895A supports 32 bit PCI transactions and 64 bit addressing.
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The SCRIPTS processor of these chips is not true 64 bit, but uses segment
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registers for bit 32-63. Another interesting feature is that LOAD/STORE
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instructions that address the on-chip RAM (8k) remain internal to the chip.
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4. Memory mapped I/O versus normal I/O
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Memory mapped I/O has less latency than normal I/O and is the recommended
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way for doing IO with PCI devices. Memory mapped I/O seems to work fine on
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most hardware configurations, but some poorly designed chipsets may break
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this feature. A configuration option is provided for normal I/O to be
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used but the driver defaults to MMIO.
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5. Tagged command queueing
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Queuing more than 1 command at a time to a device allows it to perform
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optimizations based on actual head positions and its mechanical
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characteristics. This feature may also reduce average command latency.
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In order to really gain advantage of this feature, devices must have
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a reasonable cache size (No miracle is to be expected for a low-end
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hard disk with 128 KB or less).
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Some kown old SCSI devices do not properly support tagged command queuing.
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Generally, firmware revisions that fix this kind of problems are available
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at respective vendor web/ftp sites.
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All I can say is that I never have had problem with tagged queuing using
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this driver and its predecessors. Hard disks that behaved correctly for
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me using tagged commands are the following:
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- IBM S12 0662
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- Conner 1080S
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- Quantum Atlas I
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- Quantum Atlas II
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- Seagate Cheetah I
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- Quantum Viking II
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- IBM DRVS
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- Quantum Atlas IV
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- Seagate Cheetah II
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If your controller has NVRAM, you can configure this feature per target
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from the user setup tool. The Tekram Setup program allows to tune the
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maximum number of queued commands up to 32. The Symbios Setup only allows
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to enable or disable this feature.
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The maximum number of simultaneous tagged commands queued to a device
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is currently set to 16 by default. This value is suitable for most SCSI
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disks. With large SCSI disks (>= 2GB, cache >= 512KB, average seek time
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<= 10 ms), using a larger value may give better performances.
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This driver supports up to 255 commands per device, and but using more than
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64 is generally not worth-while, unless you are using a very large disk or
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disk arrays. It is noticeable that most of recent hard disks seem not to
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accept more than 64 simultaneous commands. So, using more than 64 queued
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commands is probably just resource wasting.
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If your controller does not have NVRAM or if it is managed by the SDMS
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BIOS/SETUP, you can configure tagged queueing feature and device queue
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depths from the boot command-line. For example:
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sym53c8xx=tags:4/t2t3q15-t4q7/t1u0q32
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will set tagged commands queue depths as follow:
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- target 2 all luns on controller 0 --> 15
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- target 3 all luns on controller 0 --> 15
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- target 4 all luns on controller 0 --> 7
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- target 1 lun 0 on controller 1 --> 32
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- all other target/lun --> 4
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In some special conditions, some SCSI disk firmwares may return a
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QUEUE FULL status for a SCSI command. This behaviour is managed by the
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driver using the following heuristic:
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- Each time a QUEUE FULL status is returned, tagged queue depth is reduced
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to the actual number of disconnected commands.
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- Every 200 successfully completed SCSI commands, if allowed by the
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current limit, the maximum number of queueable commands is incremented.
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Since QUEUE FULL status reception and handling is resource wasting, the
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driver notifies by default this problem to user by indicating the actual
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number of commands used and their status, as well as its decision on the
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device queue depth change.
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The heuristic used by the driver in handling QUEUE FULL ensures that the
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impact on performances is not too bad. You can get rid of the messages by
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setting verbose level to zero, as follow:
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1st method: boot your system using 'sym53c8xx=verb:0' option.
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2nd method: apply "setverbose 0" control command to the proc fs entry
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corresponding to your controller after boot-up.
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6. Parity checking
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The driver supports SCSI parity checking and PCI bus master parity
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checking. These features must be enabled in order to ensure safe
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data transfers. Some flawed devices or mother boards may have problems
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with parity. The options to defeat parity checking have been removed
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from the driver.
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7. Profiling information
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This driver does not provide profiling informations as did its predecessors.
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This feature was not this useful and added complexity to the code.
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As the driver code got more complex, I have decided to remove everything
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that didn't seem actually useful.
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8. Control commands
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Control commands can be sent to the driver with write operations to
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the proc SCSI file system. The generic command syntax is the
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following:
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echo "<verb> <parameters>" >/proc/scsi/sym53c8xx/0
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(assumes controller number is 0)
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Using "all" for "<target>" parameter with the commands below will
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apply to all targets of the SCSI chain (except the controller).
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Available commands:
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8.1 Set minimum synchronous period factor
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setsync <target> <period factor>
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target: target number
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period: minimum synchronous period.
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Maximum speed = 1000/(4*period factor) except for special
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cases below.
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Specify a period of 0, to force asynchronous transfer mode.
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9 means 12.5 nano-seconds synchronous period
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10 means 25 nano-seconds synchronous period
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11 means 30 nano-seconds synchronous period
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12 means 50 nano-seconds synchronous period
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8.2 Set wide size
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setwide <target> <size>
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target: target number
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size: 0=8 bits, 1=16bits
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8.3 Set maximum number of concurrent tagged commands
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settags <target> <tags>
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target: target number
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tags: number of concurrent tagged commands
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must not be greater than configured (default: 16)
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8.4 Set debug mode
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setdebug <list of debug flags>
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Available debug flags:
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alloc: print info about memory allocations (ccb, lcb)
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queue: print info about insertions into the command start queue
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result: print sense data on CHECK CONDITION status
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scatter: print info about the scatter process
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scripts: print info about the script binding process
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tiny: print minimal debugging information
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timing: print timing information of the NCR chip
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nego: print information about SCSI negotiations
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phase: print information on script interruptions
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Use "setdebug" with no argument to reset debug flags.
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8.5 Set flag (no_disc)
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setflag <target> <flag>
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target: target number
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For the moment, only one flag is available:
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no_disc: not allow target to disconnect.
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Do not specify any flag in order to reset the flag. For example:
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- setflag 4
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will reset no_disc flag for target 4, so will allow it disconnections.
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- setflag all
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will allow disconnection for all devices on the SCSI bus.
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8.6 Set verbose level
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setverbose #level
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The driver default verbose level is 1. This command allows to change
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th driver verbose level after boot-up.
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8.7 Reset all logical units of a target
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resetdev <target>
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target: target number
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The driver will try to send a BUS DEVICE RESET message to the target.
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8.8 Abort all tasks of all logical units of a target
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cleardev <target>
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target: target number
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The driver will try to send a ABORT message to all the logical units
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of the target.
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9. Configuration parameters
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Under kernel configuration tools (make menuconfig, for example), it is
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possible to change some default driver configuration parameters.
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If the firmware of all your devices is perfect enough, all the
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features supported by the driver can be enabled at start-up. However,
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if only one has a flaw for some SCSI feature, you can disable the
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support by the driver of this feature at linux start-up and enable
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this feature after boot-up only for devices that support it safely.
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Configuration parameters:
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Use normal IO (default answer: n)
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Answer "y" if you suspect your mother board to not allow memory mapped I/O.
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May slow down performance a little.
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Default tagged command queue depth (default answer: 16)
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Entering 0 defaults to tagged commands not being used.
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This parameter can be specified from the boot command line.
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Maximum number of queued commands (default answer: 32)
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This option allows you to specify the maximum number of tagged commands
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that can be queued to a device. The maximum supported value is 255.
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Synchronous transfers frequency (default answer: 80)
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This option allows you to specify the frequency in MHz the driver
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will use at boot time for synchronous data transfer negotiations.
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0 means "asynchronous data transfers".
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10. Boot setup commands
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10.1 Syntax
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Setup commands can be passed to the driver either at boot time or as
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parameters to modprobe, as described in Documentation/kernel-parameters.txt
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Example of boot setup command under lilo prompt:
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lilo: linux root=/dev/sda2 sym53c8xx.cmd_per_lun=4 sym53c8xx.sync=10 sym53c8xx.debug=0x200
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- enable tagged commands, up to 4 tagged commands queued.
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- set synchronous negotiation speed to 10 Mega-transfers / second.
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- set DEBUG_NEGO flag.
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The following command will install the driver module with the same
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options as above.
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modprobe sym53c8xx cmd_per_lun=4 sync=10 debug=0x200
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10.2 Available arguments
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10.2.1 Default number of tagged commands
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cmd_per_lun=0 (or cmd_per_lun=1) tagged command queuing disabled
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cmd_per_lun=#tags (#tags > 1) tagged command queuing enabled
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#tags will be truncated to the max queued commands configuration parameter.
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10.2.2 Detailed control of tagged commands
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This option allows you to specify a command queue depth for each device
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that supports tagged command queueing.
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Example:
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tag_ctrl=10/t2t3q16-t5q24/t1u2q32
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will set devices queue depth as follow:
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- controller #0 target #2 and target #3 -> 16 commands,
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- controller #0 target #5 -> 24 commands,
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- controller #1 target #1 logical unit #2 -> 32 commands,
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- all other logical units (all targets, all controllers) -> 10 commands.
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10.2.3 Burst max
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burst=0 burst disabled
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burst=255 get burst length from initial IO register settings.
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burst=#x burst enabled (1<<#x burst transfers max)
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#x is an integer value which is log base 2 of the burst transfers max.
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By default the driver uses the maximum value supported by the chip.
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10.2.4 LED support
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led=1 enable LED support
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led=0 disable LED support
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Do not enable LED support if your scsi board does not use SDMS BIOS.
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(See 'Configuration parameters')
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10.2.4 Differential mode
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diff=0 never set up diff mode
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diff=1 set up diff mode if BIOS set it
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diff=2 always set up diff mode
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diff=3 set diff mode if GPIO3 is not set
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10.2.5 IRQ mode
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irqm=0 always open drain
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irqm=1 same as initial settings (assumed BIOS settings)
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irqm=2 always totem pole
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10.2.6 Check SCSI BUS
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buschk=<option bits>
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Available option bits:
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0x0: No check.
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0x1: Check and do not attach the controller on error.
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0x2: Check and just warn on error.
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10.2.7 Suggest a default SCSI id for hosts
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hostid=255 no id suggested.
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hostid=#x (0 < x < 7) x suggested for hosts SCSI id.
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If a host SCSI id is available from the NVRAM, the driver will ignore
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any value suggested as boot option. Otherwise, if a suggested value
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different from 255 has been supplied, it will use it. Otherwise, it will
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try to deduce the value previously set in the hardware and use value
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7 if the hardware value is zero.
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10.2.8 Verbosity level
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verb=0 minimal
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verb=1 normal
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verb=2 too much
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10.2.9 Debug mode
|
|
debug=0 clear debug flags
|
|
debug=#x set debug flags
|
|
#x is an integer value combining the following power-of-2 values:
|
|
DEBUG_ALLOC 0x1
|
|
DEBUG_PHASE 0x2
|
|
DEBUG_POLL 0x4
|
|
DEBUG_QUEUE 0x8
|
|
DEBUG_RESULT 0x10
|
|
DEBUG_SCATTER 0x20
|
|
DEBUG_SCRIPT 0x40
|
|
DEBUG_TINY 0x80
|
|
DEBUG_TIMING 0x100
|
|
DEBUG_NEGO 0x200
|
|
DEBUG_TAGS 0x400
|
|
DEBUG_FREEZE 0x800
|
|
DEBUG_RESTART 0x1000
|
|
|
|
You can play safely with DEBUG_NEGO. However, some of these flags may
|
|
generate bunches of syslog messages.
|
|
|
|
10.2.10 Settle delay
|
|
settle=n delay for n seconds
|
|
|
|
After a bus reset, the driver will delay for n seconds before talking
|
|
to any device on the bus. The default is 3 seconds and safe mode will
|
|
default it to 10.
|
|
|
|
10.2.11 Serial NVRAM
|
|
NB: option not currently implemented.
|
|
nvram=n do not look for serial NVRAM
|
|
nvram=y test controllers for onboard serial NVRAM
|
|
(alternate binary form)
|
|
nvram=<bits options>
|
|
0x01 look for NVRAM (equivalent to nvram=y)
|
|
0x02 ignore NVRAM "Synchronous negotiation" parameters for all devices
|
|
0x04 ignore NVRAM "Wide negotiation" parameter for all devices
|
|
0x08 ignore NVRAM "Scan at boot time" parameter for all devices
|
|
0x80 also attach controllers set to OFF in the NVRAM (sym53c8xx only)
|
|
|
|
10.2.12 Exclude a host from being attached
|
|
excl=<io_address>,...
|
|
|
|
Prevent host at a given io address from being attached.
|
|
For example 'excl=0xb400,0xc000' indicate to the
|
|
driver not to attach hosts at address 0xb400 and 0xc000.
|
|
|
|
10.3 Converting from old style options
|
|
|
|
Previously, the sym2 driver accepted arguments of the form
|
|
sym53c8xx=tags:4,sync:10,debug:0x200
|
|
|
|
As a result of the new module parameters, this is no longer available.
|
|
Most of the options have remained the same, but tags has split into
|
|
cmd_per_lun and tag_ctrl for its two different purposes. The sample above
|
|
would be specified as:
|
|
modprobe sym53c8xx cmd_per_lun=4 sync=10 debug=0x200
|
|
|
|
or on the kernel boot line as:
|
|
sym53c8xx.cmd_per_lun=4 sym53c8xx.sync=10 sym53c8xx.debug=0x200
|
|
|
|
10.4 SCSI BUS checking boot option.
|
|
|
|
When this option is set to a non-zero value, the driver checks SCSI lines
|
|
logic state, 100 micro-seconds after having asserted the SCSI RESET line.
|
|
The driver just reads SCSI lines and checks all lines read FALSE except RESET.
|
|
Since SCSI devices shall release the BUS at most 800 nano-seconds after SCSI
|
|
RESET has been asserted, any signal to TRUE may indicate a SCSI BUS problem.
|
|
Unfortunately, the following common SCSI BUS problems are not detected:
|
|
- Only 1 terminator installed.
|
|
- Misplaced terminators.
|
|
- Bad quality terminators.
|
|
On the other hand, either bad cabling, broken devices, not conformant
|
|
devices, ... may cause a SCSI signal to be wrong when te driver reads it.
|
|
|
|
15. SCSI problem troubleshooting
|
|
|
|
15.1 Problem tracking
|
|
|
|
Most SCSI problems are due to a non conformant SCSI bus or too buggy
|
|
devices. If infortunately you have SCSI problems, you can check the
|
|
following things:
|
|
|
|
- SCSI bus cables
|
|
- terminations at both end of the SCSI chain
|
|
- linux syslog messages (some of them may help you)
|
|
|
|
If you do not find the source of problems, you can configure the
|
|
driver or devices in the NVRAM with minimal features.
|
|
|
|
- only asynchronous data transfers
|
|
- tagged commands disabled
|
|
- disconnections not allowed
|
|
|
|
Now, if your SCSI bus is ok, your system has every chance to work
|
|
with this safe configuration but performances will not be optimal.
|
|
|
|
If it still fails, then you can send your problem description to
|
|
appropriate mailing lists or news-groups. Send me a copy in order to
|
|
be sure I will receive it. Obviously, a bug in the driver code is
|
|
possible.
|
|
|
|
My cyrrent email address: Gerard Roudier <groudier@free.fr>
|
|
|
|
Allowing disconnections is important if you use several devices on
|
|
your SCSI bus but often causes problems with buggy devices.
|
|
Synchronous data transfers increases throughput of fast devices like
|
|
hard disks. Good SCSI hard disks with a large cache gain advantage of
|
|
tagged commands queuing.
|
|
|
|
15.2 Understanding hardware error reports
|
|
|
|
When the driver detects an unexpected error condition, it may display a
|
|
message of the following pattern.
|
|
|
|
sym0:1: ERROR (0:48) (1-21-65) (f/95/0) @ (script 7c0:19000000).
|
|
sym0: script cmd = 19000000
|
|
sym0: regdump: da 10 80 95 47 0f 01 07 75 01 81 21 80 01 09 00.
|
|
|
|
Some fields in such a message may help you understand the cause of the
|
|
problem, as follows:
|
|
|
|
sym0:1: ERROR (0:48) (1-21-65) (f/95/0) @ (script 7c0:19000000).
|
|
.....A.........B.C....D.E..F....G.H..I.......J.....K...L.......
|
|
|
|
Field A : target number.
|
|
SCSI ID of the device the controller was talking with at the moment the
|
|
error occurs.
|
|
|
|
Field B : DSTAT io register (DMA STATUS)
|
|
Bit 0x40 : MDPE Master Data Parity Error
|
|
Data parity error detected on the PCI BUS.
|
|
Bit 0x20 : BF Bus Fault
|
|
PCI bus fault condition detected
|
|
Bit 0x01 : IID Illegal Instruction Detected
|
|
Set by the chip when it detects an Illegal Instruction format
|
|
on some condition that makes an instruction illegal.
|
|
Bit 0x80 : DFE Dma Fifo Empty
|
|
Pure status bit that does not indicate an error.
|
|
If the reported DSTAT value contains a combination of MDPE (0x40),
|
|
BF (0x20), then the cause may be likely due to a PCI BUS problem.
|
|
|
|
Field C : SIST io register (SCSI Interrupt Status)
|
|
Bit 0x08 : SGE SCSI GROSS ERROR
|
|
Indicates that the chip detected a severe error condition
|
|
on the SCSI BUS that prevents the SCSI protocol from functioning
|
|
properly.
|
|
Bit 0x04 : UDC Unexpected Disconnection
|
|
Indicates that the device released the SCSI BUS when the chip
|
|
was not expecting this to happen. A device may behave so to
|
|
indicate the SCSI initiator that an error condition not reportable using the SCSI protocol has occurred.
|
|
Bit 0x02 : RST SCSI BUS Reset
|
|
Generally SCSI targets do not reset the SCSI BUS, although any
|
|
device on the BUS can reset it at any time.
|
|
Bit 0x01 : PAR Parity
|
|
SCSI parity error detected.
|
|
On a faulty SCSI BUS, any error condition among SGE (0x08), UDC (0x04) and
|
|
PAR (0x01) may be detected by the chip. If your SCSI system sometimes
|
|
encounters such error conditions, especially SCSI GROSS ERROR, then a SCSI
|
|
BUS problem is likely the cause of these errors.
|
|
|
|
For fields D,E,F,G and H, you may look into the sym53c8xx_defs.h file
|
|
that contains some minimal comments on IO register bits.
|
|
Field D : SOCL Scsi Output Control Latch
|
|
This register reflects the state of the SCSI control lines the
|
|
chip want to drive or compare against.
|
|
Field E : SBCL Scsi Bus Control Lines
|
|
Actual value of control lines on the SCSI BUS.
|
|
Field F : SBDL Scsi Bus Data Lines
|
|
Actual value of data lines on the SCSI BUS.
|
|
Field G : SXFER SCSI Transfer
|
|
Contains the setting of the Synchronous Period for output and
|
|
the current Synchronous offset (offset 0 means asynchronous).
|
|
Field H : SCNTL3 Scsi Control Register 3
|
|
Contains the setting of timing values for both asynchronous and
|
|
synchronous data transfers.
|
|
Field I : SCNTL4 Scsi Control Register 4
|
|
Only meaninful for 53C1010 Ultra3 controllers.
|
|
|
|
Understanding Fields J, K, L and dumps requires to have good knowledge of
|
|
SCSI standards, chip cores functionnals and internal driver data structures.
|
|
You are not required to decode and understand them, unless you want to help
|
|
maintain the driver code.
|
|
|
|
17. Serial NVRAM (added by Richard Waltham: dormouse@farsrobt.demon.co.uk)
|
|
|
|
17.1 Features
|
|
|
|
Enabling serial NVRAM support enables detection of the serial NVRAM included
|
|
on Symbios and some Symbios compatible host adaptors, and Tekram boards. The
|
|
serial NVRAM is used by Symbios and Tekram to hold set up parameters for the
|
|
host adaptor and it's attached drives.
|
|
|
|
The Symbios NVRAM also holds data on the boot order of host adaptors in a
|
|
system with more than one host adaptor. This information is no longer used
|
|
as it's fundamentally incompatible with the hotplug PCI model.
|
|
|
|
Tekram boards using Symbios chips, DC390W/F/U, which have NVRAM are detected
|
|
and this is used to distinguish between Symbios compatible and Tekram host
|
|
adaptors. This is used to disable the Symbios compatible "diff" setting
|
|
incorrectly set on Tekram boards if the CONFIG_SCSI_53C8XX_SYMBIOS_COMPAT
|
|
configuration parameter is set enabling both Symbios and Tekram boards to be
|
|
used together with the Symbios cards using all their features, including
|
|
"diff" support. ("led pin" support for Symbios compatible cards can remain
|
|
enabled when using Tekram cards. It does nothing useful for Tekram host
|
|
adaptors but does not cause problems either.)
|
|
|
|
The parameters the driver is able to get from the NVRAM depend on the
|
|
data format used, as follow:
|
|
|
|
Tekram format Symbios format
|
|
General and host parameters
|
|
Boot order N Y
|
|
Host SCSI ID Y Y
|
|
SCSI parity checking Y Y
|
|
Verbose boot messages N Y
|
|
SCSI devices parameters
|
|
Synchronous transfer speed Y Y
|
|
Wide 16 / Narrow Y Y
|
|
Tagged Command Queuing enabled Y Y
|
|
Disconnections enabled Y Y
|
|
Scan at boot time N Y
|
|
|
|
In order to speed up the system boot, for each device configured without
|
|
the "scan at boot time" option, the driver forces an error on the
|
|
first TEST UNIT READY command received for this device.
|
|
|
|
|
|
17.2 Symbios NVRAM layout
|
|
|
|
typical data at NVRAM address 0x100 (53c810a NVRAM)
|
|
-----------------------------------------------------------
|
|
00 00
|
|
64 01
|
|
8e 0b
|
|
|
|
00 30 00 00 00 00 07 00 00 00 00 00 00 00 07 04 10 04 00 00
|
|
|
|
04 00 0f 00 00 10 00 50 00 00 01 00 00 62
|
|
04 00 03 00 00 10 00 58 00 00 01 00 00 63
|
|
04 00 01 00 00 10 00 48 00 00 01 00 00 61
|
|
00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
00 00 00 00 00 00 00 00
|
|
|
|
fe fe
|
|
00 00
|
|
00 00
|
|
-----------------------------------------------------------
|
|
NVRAM layout details
|
|
|
|
NVRAM Address 0x000-0x0ff not used
|
|
0x100-0x26f initialised data
|
|
0x270-0x7ff not used
|
|
|
|
general layout
|
|
|
|
header - 6 bytes,
|
|
data - 356 bytes (checksum is byte sum of this data)
|
|
trailer - 6 bytes
|
|
---
|
|
total 368 bytes
|
|
|
|
data area layout
|
|
|
|
controller set up - 20 bytes
|
|
boot configuration - 56 bytes (4x14 bytes)
|
|
device set up - 128 bytes (16x8 bytes)
|
|
unused (spare?) - 152 bytes (19x8 bytes)
|
|
---
|
|
total 356 bytes
|
|
|
|
-----------------------------------------------------------
|
|
header
|
|
|
|
00 00 - ?? start marker
|
|
64 01 - byte count (lsb/msb excludes header/trailer)
|
|
8e 0b - checksum (lsb/msb excludes header/trailer)
|
|
-----------------------------------------------------------
|
|
controller set up
|
|
|
|
00 30 00 00 00 00 07 00 00 00 00 00 00 00 07 04 10 04 00 00
|
|
| | | |
|
|
| | | -- host ID
|
|
| | |
|
|
| | --Removable Media Support
|
|
| | 0x00 = none
|
|
| | 0x01 = Bootable Device
|
|
| | 0x02 = All with Media
|
|
| |
|
|
| --flag bits 2
|
|
| 0x00000001= scan order hi->low
|
|
| (default 0x00 - scan low->hi)
|
|
--flag bits 1
|
|
0x00000001 scam enable
|
|
0x00000010 parity enable
|
|
0x00000100 verbose boot msgs
|
|
|
|
remaining bytes unknown - they do not appear to change in my
|
|
current set up for any of the controllers.
|
|
|
|
default set up is identical for 53c810a and 53c875 NVRAM
|
|
(Removable Media added Symbios BIOS version 4.09)
|
|
-----------------------------------------------------------
|
|
boot configuration
|
|
|
|
boot order set by order of the devices in this table
|
|
|
|
04 00 0f 00 00 10 00 50 00 00 01 00 00 62 -- 1st controller
|
|
04 00 03 00 00 10 00 58 00 00 01 00 00 63 2nd controller
|
|
04 00 01 00 00 10 00 48 00 00 01 00 00 61 3rd controller
|
|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 4th controller
|
|
| | | | | | | |
|
|
| | | | | | ---- PCI io port adr
|
|
| | | | | --0x01 init/scan at boot time
|
|
| | | | --PCI device/function number (0xdddddfff)
|
|
| | ----- ?? PCI vendor ID (lsb/msb)
|
|
----PCI device ID (lsb/msb)
|
|
|
|
?? use of this data is a guess but seems reasonable
|
|
|
|
remaining bytes unknown - they do not appear to change in my
|
|
current set up
|
|
|
|
default set up is identical for 53c810a and 53c875 NVRAM
|
|
-----------------------------------------------------------
|
|
device set up (up to 16 devices - includes controller)
|
|
|
|
0f 00 08 08 64 00 0a 00 - id 0
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00
|
|
0f 00 08 08 64 00 0a 00 - id 15
|
|
| | | | | |
|
|
| | | | ----timeout (lsb/msb)
|
|
| | | --synch period (0x?? 40 Mtrans/sec- fast 40) (probably 0x28)
|
|
| | | (0x30 20 Mtrans/sec- fast 20)
|
|
| | | (0x64 10 Mtrans/sec- fast )
|
|
| | | (0xc8 5 Mtrans/sec)
|
|
| | | (0x00 asynchronous)
|
|
| | -- ?? max sync offset (0x08 in NVRAM on 53c810a)
|
|
| | (0x10 in NVRAM on 53c875)
|
|
| --device bus width (0x08 narrow)
|
|
| (0x10 16 bit wide)
|
|
--flag bits
|
|
0x00000001 - disconnect enabled
|
|
0x00000010 - scan at boot time
|
|
0x00000100 - scan luns
|
|
0x00001000 - queue tags enabled
|
|
|
|
remaining bytes unknown - they do not appear to change in my
|
|
current set up
|
|
|
|
?? use of this data is a guess but seems reasonable
|
|
(but it could be max bus width)
|
|
|
|
default set up for 53c810a NVRAM
|
|
default set up for 53c875 NVRAM - bus width - 0x10
|
|
- sync offset ? - 0x10
|
|
- sync period - 0x30
|
|
-----------------------------------------------------------
|
|
?? spare device space (32 bit bus ??)
|
|
|
|
00 00 00 00 00 00 00 00 (19x8bytes)
|
|
.
|
|
.
|
|
00 00 00 00 00 00 00 00
|
|
|
|
default set up is identical for 53c810a and 53c875 NVRAM
|
|
-----------------------------------------------------------
|
|
trailer
|
|
|
|
fe fe - ? end marker ?
|
|
00 00
|
|
00 00
|
|
|
|
default set up is identical for 53c810a and 53c875 NVRAM
|
|
-----------------------------------------------------------
|
|
|
|
|
|
|
|
17.3 Tekram NVRAM layout
|
|
|
|
nvram 64x16 (1024 bit)
|
|
|
|
Drive settings
|
|
|
|
Drive ID 0-15 (addr 0x0yyyy0 = device setup, yyyy = ID)
|
|
(addr 0x0yyyy1 = 0x0000)
|
|
|
|
x x x x x x x x x x x x x x x x
|
|
| | | | | | | | |
|
|
| | | | | | | | ----- parity check 0 - off
|
|
| | | | | | | | 1 - on
|
|
| | | | | | | |
|
|
| | | | | | | ------- sync neg 0 - off
|
|
| | | | | | | 1 - on
|
|
| | | | | | |
|
|
| | | | | | --------- disconnect 0 - off
|
|
| | | | | | 1 - on
|
|
| | | | | |
|
|
| | | | | ----------- start cmd 0 - off
|
|
| | | | | 1 - on
|
|
| | | | |
|
|
| | | | -------------- tagged cmds 0 - off
|
|
| | | | 1 - on
|
|
| | | |
|
|
| | | ---------------- wide neg 0 - off
|
|
| | | 1 - on
|
|
| | |
|
|
--------------------------- sync rate 0 - 10.0 Mtrans/sec
|
|
1 - 8.0
|
|
2 - 6.6
|
|
3 - 5.7
|
|
4 - 5.0
|
|
5 - 4.0
|
|
6 - 3.0
|
|
7 - 2.0
|
|
7 - 2.0
|
|
8 - 20.0
|
|
9 - 16.7
|
|
a - 13.9
|
|
b - 11.9
|
|
|
|
Global settings
|
|
|
|
Host flags 0 (addr 0x100000, 32)
|
|
|
|
x x x x x x x x x x x x x x x x
|
|
| | | | | | | | | | | |
|
|
| | | | | | | | ----------- host ID 0x00 - 0x0f
|
|
| | | | | | | |
|
|
| | | | | | | ----------------------- support for 0 - off
|
|
| | | | | | | > 2 drives 1 - on
|
|
| | | | | | |
|
|
| | | | | | ------------------------- support drives 0 - off
|
|
| | | | | | > 1Gbytes 1 - on
|
|
| | | | | |
|
|
| | | | | --------------------------- bus reset on 0 - off
|
|
| | | | | power on 1 - on
|
|
| | | | |
|
|
| | | | ----------------------------- active neg 0 - off
|
|
| | | | 1 - on
|
|
| | | |
|
|
| | | -------------------------------- imm seek 0 - off
|
|
| | | 1 - on
|
|
| | |
|
|
| | ---------------------------------- scan luns 0 - off
|
|
| | 1 - on
|
|
| |
|
|
-------------------------------------- removable 0 - disable
|
|
as BIOS dev 1 - boot device
|
|
2 - all
|
|
|
|
Host flags 1 (addr 0x100001, 33)
|
|
|
|
x x x x x x x x x x x x x x x x
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|
| | | | | |
|
|
| | | --------- boot delay 0 - 3 sec
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|
| | | 1 - 5
|
|
| | | 2 - 10
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|
| | | 3 - 20
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| | | 4 - 30
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|
| | | 5 - 60
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|
| | | 6 - 120
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|
| | |
|
|
--------------------------- max tag cmds 0 - 2
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|
1 - 4
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|
2 - 8
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|
3 - 16
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|
4 - 32
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|
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Host flags 2 (addr 0x100010, 34)
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|
|
|
x x x x x x x x x x x x x x x x
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|
|
|
|
----- F2/F6 enable 0 - off ???
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|
1 - on ???
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|
|
|
checksum (addr 0x111111)
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|
|
checksum = 0x1234 - (sum addr 0-63)
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|
|
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----------------------------------------------------------------------------
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|
|
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default nvram data:
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|
|
|
0x0037 0x0000 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000
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|
0x0037 0x0000 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000
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|
0x0037 0x0000 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000
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|
0x0037 0x0000 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000
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|
|
|
0x0f07 0x0400 0x0001 0x0000 0x0000 0x0000 0x0000 0x0000
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|
0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
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|
0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
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|
0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0xfbbc
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|
|
|
|
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===============================================================================
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End of Linux SYM-2 driver documentation file
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