157 lines
5.8 KiB
Plaintext
157 lines
5.8 KiB
Plaintext
Information about the simple chooser
|
|
--------------------------------------
|
|
Copyright (C) 2002-2003 Hewlett-Packard Co.
|
|
Contributed by Stephane Eranian <eranian@hpl.hp.com>
|
|
|
|
Last updated: 02/02/14
|
|
|
|
Chooser name: simple
|
|
Command line option: -C simple
|
|
Config file option: chooser=simple, description, message
|
|
|
|
The simple chooser is the default chooser. However it is possible
|
|
to disable it at compile time, it is highly recommended to keep it
|
|
in. Elilo must have at least one chooser compiled in.
|
|
|
|
The simple chooser is very basic as its name indicates! It provides
|
|
a simple one line text mode command prompt similar to what you get
|
|
with Lilo/x86.
|
|
|
|
Any chooser becomes visible to the user ONLY when the interactive
|
|
mode is entered.
|
|
|
|
The simple chooser allows the user to select a kernel to boot.
|
|
The user can use a label as specified in the elilo config file
|
|
or a kernel file name. File names can be specified with
|
|
absolute names in the form dev_name:/path/to/my_kernel.
|
|
|
|
1/ Activation
|
|
|
|
The chooser is activated from:
|
|
|
|
- command line with the -c simple
|
|
- the config file with the chooser=simple option
|
|
|
|
2/ Supported options
|
|
|
|
The simple chooser supports the following options in the config file:
|
|
|
|
message=filename : display a message before the prompt. The filename
|
|
must be an ASCII file
|
|
|
|
description=string: a description of the kernel image (ASCII)
|
|
|
|
All other options have their standard meaning. The chooser does not recognize
|
|
the fX (X varies from 1-12) options
|
|
|
|
2/ Builtin commands
|
|
|
|
The simple chooser has some builtin command which the user can
|
|
get to by typing certain keys as the first character on the command line:
|
|
|
|
TAB: shows the list of defined labels and their descriptions.
|
|
|
|
If the user did not type anything, i.e., the line is empty,
|
|
pressing TAB will print the list of labels defined in the
|
|
elilo config file.
|
|
|
|
If the user already typed a name and if the name corresponds
|
|
to a specified label, the chooser will show how the label
|
|
is expanded and what the final command line to the kernel will
|
|
look like.
|
|
|
|
If the line is empty pressing TAB generates something similar to:
|
|
ELILO boot:
|
|
linux-up linux nfsroot (or any kernel file name: [dev_name:]/path/file)
|
|
|
|
Note that first label correspond to the default label used if the user
|
|
hits the enter key with an empty line. This label is not necessarily
|
|
the first one in the config file.
|
|
|
|
Now pressing TAB with a full label name:
|
|
|
|
ELILO boot: linux-up
|
|
desc : my default UP kernel
|
|
cmdline: vmlinuz root=/dev/sdb2 console=ttyS0,115200n8 console=tty0 ro
|
|
|
|
The desc line shows whatever was specified in the "description" option
|
|
for this particular image in the config file.
|
|
|
|
= : shows the list of accessible devices
|
|
|
|
this key force elilo to print the list of detected devices. Elilo will
|
|
auto-detect the devices which are accessible to load a config file, the kernel, the
|
|
initrd from. Those devices typically represent disk partition, CDROM, floppy, or
|
|
a network path. The list of devices is highly system dependent.
|
|
It also depends on the filesystem support compiled into elilo.
|
|
|
|
The way the devices are named depends on the device naming scheme
|
|
selected. It also depends on whether the EDD30 support is activated.
|
|
For instance, pressing the ? could look as follows:
|
|
|
|
ELILO boot:
|
|
scsi0 : vfat : Acpi(PNP0A03,2)/Pci(1|0)/Scsi(Pun0,Lun0)/HD(Part1,Sig72040800)
|
|
scsi1 : vfat : Acpi(PNP0A03,2)/Pci(1|0)/Scsi(Pun6,Lun0)/HD(Part1,Sig00000000)
|
|
scsi2 : ext2fs : Acpi(PNP0A03,2)/Pci(1|0)/Scsi(Pun0,Lun0)/HD(Part2,Sig72040800)
|
|
scsi3 : ext2fs : Acpi(PNP0A03,2)/Pci(1|0)/Scsi(Pun6,Lun0)/HD(Part2,Sig00000000)
|
|
net0 : netfs : Acpi(PNP0A03,0)/Pci(5|0)/Mac(00D0B7A6FC25)
|
|
5 devices available for booting
|
|
boot device net0: netfs
|
|
|
|
Here the vfat (EFI partition type), ext2fs and network filesysten (not to be confused
|
|
with NFS) were compiled into elilo and were detected on the machine. The left handside
|
|
of the colon show the logical name associated with the device. For instance,
|
|
scsi0 corresponds to the first partition of SCSI disk ID 0 and is an EFI partition.
|
|
The net0 correspond to a network device, here the Ethernet adapter. The last line
|
|
show the device used to load elilo itself, in the case elilo was downloaded from the
|
|
network.
|
|
|
|
To get a kernel from scsi0, the user can simply type:
|
|
|
|
ELILO boot: scsi0:/usr/src/linux/vmlinux
|
|
|
|
Note that even though elilo was not downloaded from the network, it is still possible
|
|
to get the kernel and initrd from a remote machine.
|
|
|
|
% : shows the list of defined variables
|
|
|
|
Elilo has builtin variables which are used to dynamically customized the command line
|
|
parameters passed to the kernel. The list of variables depends on the support compiled
|
|
into elilo. Not all elilo subsystems use variables. Typically the network file system
|
|
does. Pressing '%' only prints the variables that are defined with their current values.
|
|
Some variables are only defined once the subsystem that creates them has been used.
|
|
In other words, if the network filesystem was not used to load elilo, then the variables
|
|
defined by it are not created.
|
|
|
|
If the network was actually used, pressing '%' could generate the following output:
|
|
ELILO boot:
|
|
D = "mydomain.com
|
|
G = "192.168.3.1"
|
|
H = "test_machine"
|
|
I = "192.168.3.4"
|
|
M = "255.255.255.0"
|
|
|
|
& : shows the list default path
|
|
|
|
The path is used as a prefix for all filenames specified as
|
|
relative.
|
|
|
|
? : shows the list of supported command keys
|
|
|
|
|
|
The simple chooser has also some builtin command line editing commands:
|
|
|
|
ESC : abort (leave elilo)
|
|
|
|
CTRL-D : abort (leave elilo)
|
|
|
|
CTRL-C : kill line
|
|
empty current line and prompt for new input
|
|
|
|
CTRL-H : erase the previous character
|
|
|
|
CTRL-U : clear current line
|
|
reset the buffer (does not display correctly if buffer spans more than one line)
|
|
|
|
Backspace: erase character
|