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Eric Snowberg 3434ddec0e ieee1275: obdisk driver
Add a new disk driver called obdisk for IEEE1275 platforms.  Currently
the only platform using this disk driver is SPARC, however other IEEE1275
platforms could start using it if they so choose.  While the functionality
within the current IEEE1275 ofdisk driver may be suitable for PPC and x86, it
presented too many problems on SPARC hardware.

Within the old ofdisk, there is not a way to determine the true canonical
name for the disk.  Within Open Boot, the same disk can have multiple names
but all reference the same disk.  For example the same disk can be referenced
by its SAS WWN, using this form:

/pci@302/pci@2/pci@0/pci@17/LSI,sas@0/disk@w5000cca02f037d6d,0

It can also be referenced by its PHY identifier using this form:

/pci@302/pci@2/pci@0/pci@17/LSI,sas@0/disk@p0

It can also be referenced by its Target identifier using this form:

/pci@302/pci@2/pci@0/pci@17/LSI,sas@0/disk@0

Also, when the LUN=0, it is legal to omit the ,0 from the device name.  So with
the disk above, before taking into account the device aliases, there are 6 ways
to reference the same disk.

Then it is possible to have 0 .. n device aliases all representing the same disk.
Within this new driver the true canonical name is determined using the the
IEEE1275 encode-unit and decode-unit commands when address_cells == 4.  This
will determine the true single canonical name for the device so multiple ihandles
are not opened for the same device.  This is what frequently happens with the old
ofdisk driver.  With some devices when they are opened multiple times it causes
the entire system to hang.

Another problem solved with this driver is devices that do not have a device
alias can be booted and used within GRUB. Within the old ofdisk, this was not
possible, unless it was the original boot device.  All devices behind a SAS
or SCSI parent can be found.   Within the old ofdisk, finding these disks
relied on there being an alias defined.  The alias requirement is not
necessary with this new driver.  It can also find devices behind a parent
after they have been hot-plugged.  This is something that is not possible
with the old ofdisk driver.

The old ofdisk driver also incorrectly assumes that the device pointing to by a
device alias is in its true canonical form. This assumption is never made with
this new driver.

Another issue solved with this driver is that it properly caches the ihandle
for all open devices.  The old ofdisk tries to do this by caching the last
opened ihandle.  However this does not work properly because the layer above
does not use a consistent device name for the same disk when calling into the
driver.  This is because the upper layer uses the bootpath value returned within
/chosen, other times it uses the device alias, and other times it uses the
value within grub.cfg.  It does not have a way to figure out that these devices
are the same disk.  This is not a problem with this new driver.

Due to the way GRUB repeatedly opens and closes the same disk. Caching the
ihandle is important on SPARC.  Without caching, some SAS devices can take
15 - 20 minutes to get to the GRUB menu. This ihandle caching is not possible
without correctly having the canonical disk name.

When available, this driver also tries to use the deblocker #blocks and
a way of determining the disk size.

Finally and probably most importantly, this new driver is also capable of
seeing all partitions on a GPT disk.  With the old driver, the GPT
partition table can not be read and only the first partition on the disk
can be seen.

Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2019-03-12 20:04:07 +01:00
asm-tests asm-tests/i386-pc: Check that movl is 5 bytes. 2016-09-28 20:31:04 +03:00
conf gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
docs gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
grub-core ieee1275: obdisk driver 2019-03-12 20:04:07 +01:00
include ieee1275: obdisk driver 2019-03-12 20:04:07 +01:00
po gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
tests syslinux: Fix syslinux_test in out-of-tree builds 2019-03-05 10:27:53 +01:00
themes/starfield Starfield theme. 2012-02-23 17:21:38 +01:00
unicode * unicode: Import Unicode 6.0 data. 2011-12-25 16:17:25 +01:00
util gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
.gitignore gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
.travis.yml travis: Add Travis CI config file 2019-02-25 14:02:06 +01:00
acinclude.m4 Fix -nopie/-nopie check. 2017-01-30 19:38:55 +01:00
AUTHORS 2005-09-03 Yoshinori K. Okuji <okuji@enbug.org> 2005-09-03 16:54:27 +00:00
autogen.sh gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
bootstrap gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
bootstrap.conf gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
BUGS * BUGS: New file. 2011-01-11 00:06:01 +01:00
ChangeLog-2015 Autogenerate ChangeLog from git changelog. 2015-01-24 17:29:50 +01:00
config.h.in Remove libgcc dependency. 2015-03-03 20:50:37 +01:00
configure.ac gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
COPYING 2007-07-22 Yoshinori K. Okuji <okuji@enbug.org> 2007-07-21 23:32:33 +00:00
coreboot.cfg * coreboot.cfg: Add missing file. 2013-11-20 00:52:23 +01:00
geninit.sh automake commit without merge history 2010-05-06 11:34:04 +05:30
gentpl.py RISC-V: Add to build system 2019-02-25 14:02:05 +01:00
INSTALL gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
linguas.sh linguas: Don't skip ko.po. 2017-02-04 00:06:57 +01:00
Makefile.am Makefile: Allow to set file systems modules for default_payload.elf 2019-03-12 20:04:07 +01:00
Makefile.util.def gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
NEWS NEWS updates 2016-11-22 20:51:54 +03:00
README README: Remove dead link to the wiki 2015-11-06 04:31:23 +01:00
THANKS 2009-12-11 Robert Millan <rmh.grub@aybabtu.com> 2009-12-11 22:44:47 +00:00
TODO TODO: Remove obsolete link 2016-02-12 17:51:52 +01:00

This is GRUB 2, the second version of the GRand Unified Bootloader.
GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more
robust, more powerful, and more portable.

See the file NEWS for a description of recent changes to GRUB 2.

See the file INSTALL for instructions on how to build and install the
GRUB 2 data and program files.

Please visit the official web page of GRUB 2, for more information.
The URL is <http://www.gnu.org/software/grub/grub.html>.

More extensive documentation is available in the Info manual,
accessible using 'info grub' after building and installing GRUB 2.

There are a number of important user-visible differences from the
first version of GRUB, now known as GRUB Legacy. For a summary, please
see:

  info grub Introduction 'Changes from GRUB Legacy'