This section will walk you through pre-installation hardware setup, if any, that you will need to do prior to installing Ubuntu. Generally, this involves checking and possibly changing firmware settings for your system. The “firmware” is the core software used by the hardware; it is most critically invoked during the bootstrap process (after power-up). Known hardware issues affecting the reliability of Ubuntu on your system are also highlighted.
OpenBoot provides the basic functions needed to boot the SPARC architecture. This is rather similar in function to the BIOS in the x86 architecture, although much nicer. The Sun boot PROMs have a built-in forth interpreter which lets you do quite a number of things with your machine, such as diagnostics and simple scripts.
To get to the boot prompt you need to hold down the
Stop key (on older type 4 keyboards, use the
L1 key, if you have a PC keyboard adapter, use
the Break key) and press the
A key. The boot PROM will give you a prompt,
either ok or >. It is
preferred to have the ok prompt. So if you get
the old style prompt, hit the n key to get the new
style prompt.
If you are using a serial console, send a break to the machine. With Minicom,
use Ctrl-A F, with cu, hit Enter, then type
%~break. Consult the documentation of your terminal
emulator if you are using a different program.
You can use OpenBoot to boot from specific devices, and also to change your default boot device. However, you need to know some details about how OpenBoot names devices; it's considerably different from Linux device naming, described in the section called “Device Names in Linux”. Also, the command will vary a bit, depending on what version of OpenBoot you have. More information about OpenBoot can be found in the Sun OpenBoot Reference.
Typically, with newer revisions, you can use OpenBoot devices such as “floppy”, “cdrom”, “net”, “disk”, or “disk2”. These have the obvious meanings; the “net” device is for booting from the network. Additionally, the device name can specify a particular partition of a disk, such as “disk2:a” to boot disk2, first partition. Full OpenBoot device names have the form:
driver-name@
unit-address:
device-arguments
In older revisions of OpenBoot, device naming is a bit different: the
floppy device is called “/fd”, and SCSI disk devices are of
the form “sd(controller,
disk-target-id,
disk-lun)”. The command
show-devs in newer OpenBoot revisions is useful
for viewing the currently configured devices. For full information,
whatever your revision, see the
Sun OpenBoot Reference.
To boot from a specific device, use the command boot
. You can set this
behavior as the default using the devicesetenv
command. However, the name of the variable to set changed between
OpenBoot revisions. In OpenBoot 1.x, use the command
setenv boot-from
. In later revisions of
OpenBoot, use the command devicesetenv boot-device
. Note, this is also
configurable using the eeprom command on Solaris,
or modifying the appropriate files in
device/proc/openprom/options/, for example under Linux:
# echo disk1:1 > /proc/openprom/options/boot-device
and under Solaris:
eeprom boot-device=disk1:1
