I upgraded the bios in my Thinkpad X60s from 2.17 to 2.18. It was complicated because the IBM BIOS upgrade disc only has drivers for the drive in the docking station, which I do not have.

When I tried booting the upgrade CD in a Lite-On DVD drive, the upgrade failed with the following error.

Device driver not found: 'TPCD001'.
No valid CDROM device drivers selected
Bad command or file name
Invalid drive specification

I found instructions for upgrading the BIOS on ThinkWiki. I used "Approach 1."

Because I suspended to disk, I didn't even need to restart my Linux session to perform the BIOS upgrade.