Building a boot floppy for BIOS flashing
May 11, 2006
Part of today was arranging to flash a new BIOS on my new machine here (in the hopes that the most recent BIOS version would fix a mysterious memory corruption problem). This was a bunch of annoyance, because I had to come up with a bootable MS-DOS floppy to run Tyan's BIOS flasher program from. So that I don't have to go through all the work next time around, I'm going to put what I found here.
In the old days, it was simple: I'd go ask someone running Windows 95 or 98 to make me a boot floppy, slap the flash update program on it, and go. Unfortunately, no one around here is running those Windows versions any more and apparently newer versions can't do this any more. (Since Windows is no longer based on MS-DOS, this isn't too surprising.)
What you really need is a bootable DOS floppy image that you can just dump onto a floppy. What I used is the FreeDOS image from Flashing BIOSes; the actual article is mostly about making bootable CD-ROMs for BIOS flashing. (When booted the image will offer you a bunch of options for what next; pick 'clean boot'. There's probably some way to set it to boot straight to the old-style DOS prompt, but I didn't poke around.)
Other approaches and more information
There's a number of places with actual MS-DOS boot images (copyright
Microsoft and all), like here
or here, but they tend to have them
wrapped up in DOS .exe files and other odd formats instead of being in
Flashing PC BIOS under Unix/Linux in non-traumatic fashion has one of these in a convenient for Linux format, and instructions as well.
If you don't want to bother with the mess of an actual floppy and already have a working Linux installation, look at memdisk. Memdisk will boot a floppy image from memory, without the mess of a physical floppy. The drawback of this is that you can't save the old BIOS image if your BIOS flashing program offers this option.
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