You've finally made the move to a Free Windows computer, you're  enjoying your brand new Linux OS, no trojans or viruses, no slowdown,  everything is perfect. Suddenly, you need to update the BIOS on your  motherboard to support some new piece of hardware, but typically the  motherboard vendor is offering only DOS based BIOS flash utilities. You  panic! Fortunately, this problem is easy to solve...
Step 1 : Download FreeDOS boot disk floppy image
FreeDOS, a free DOS-compatible  operating system, is up to the challenge, no need for proprietary DOS  versions. So, all you need is a bootable floppy disk image with FreeDOS  kernel on it. We are fortunate that guys at 
FDOS site have prepared one suitable for us. Use the 
OEM Bootdisk  version, the one with just kernel and command.com, because it leaves  more free space on disk for the flash utility and new BIOS image. You  can also find a local copy of this image attached at the end of this  article. After you download the image, you need to decompress it. In  other words:
wget http://www.fdos.org/bootdisks/autogen/FDOEM.144.gz
gunzip FDOEM.144.gz
Step 2 : Copy your BIOS flash utility and new BIOS image to the mounted floppy disk image
Requirement for this step is that you have support for the 
vfat and 
loop  file systems in the kernel. Or you can have those features compiled as  modules. In the latter case, load the modules before the next step, like  this.
modprobe vfat
modprobe loop
Consult 
/proc/fileystems  to see if you have the needed file systems supported. If you do, you  should be able to "loop mount" the floppy disk image to some temporary  path:
mkdir /tmp/floppy
mount -t vfat -o loop FDOEM.144 /tmp/floppy
If the mount went without errors, copy BIOS flash utility and new BIOS  image to the mounted floppy disk image. You'll probably have to unzip  the archive you downloaded from your motherboard vendor site, to get to  those two files. Here's just an example for my motherboard (in your  case, files will have different names, of course):
# unzip 775Dual-VSTA\(2.60\).zip
Archive:  775Dual-VSTA(2.60).zip
  inflating: 75DVSTA2.60
  inflating: ASRflash.exe
# cp 75DVSTA2.60 ASRflash.exe /tmp/floppy
Doublecheck that everything went OK, that those two files weren't too big for the floppy:
Filesystem           1K-blocks      Used Available Use% Mounted on
/tmp/FDOEM.144
                          1424       990       434  70% /tmp/floppy
Finally, unmount the floppy disk image:
umount /tmp/floppy
Step 3 : Burn a bootable CD which will emulate floppy device for us
Next step is to burn the floppy image to a CD/DVD-RW media, but in a  way that it can be booted afterwards. First we need to make a bootable  CD image, and then burn it. Notice that on some modern distributions, 
cdrecord is renamed to 
wodim, and 
mkisofs to 
genisoimage, but the parameters below should be the same.
mkisofs -o bootcd.iso -b FDOEM.144 FDOEM.144
cdrecord -v bootcd.iso
Step 4 : Reboot, flash, reboot, and enjoy your new BIOS
Finally reboot your machine, make sure that your CD drive is first in  the boot sequence, and then run your BIOS upgrade procedure when the CD  boots.
WARNING: Flashing motherboard BIOS is a dangerous  activity that can render your motherboard inoperable! While the author  of this article has successfully run this procedure many times, your  mileage may vary. Be careful!