If your BIOS supports booting Firewire, check out this-
Also check this out-
# How can I boot from my hardware device
(ATA, USB, FireWire, ZIP, etc.)?
* OSL2000 can boot most bootable
devices provided it is recognized by
your system BIOS at boot time. To check
whether your system BIOS supports
booting from your device, do the following:
(1) Connect your device and start Windows (or DOS).
(2) If the device requires initialization (like partitioning, formatting, etc.), then do it.
(3) Install OSL2000 and restart your system.
Note: If the device appears in the boot menu, then OSL2000 can boot that device. If you're experiencing problems, then please try the following:
(1) In some systems, the BIOS support for booting some devices is disabled by default. If you have one such system, then you have to enter the BIOS setup during startup and manually enable the option to boot from the device.
(2) Sometimes, the boot menu might recognize your hardware device as a hard disk. This is a cosmetic issue and can be safely ignored.
(3) Whenever you select "CD-Rom" from the OSL2000 boot menu, it tries to boot the "second" boot device selected in your system BIOS. So, if you select your device as the second boot device in your system BIOS, you can boot your device directly from the OSL2000 boot menu by selecting "CD-Rom".
So, maybe that can help too.