Flashing a BIOS is a delicate procedure, it should definitely be done in real mode... that way it's the only process running, uninterrupted.
Some vendors release a Windows utility that creates a disk image, such a utility would probably be useless under Wine... as would any utility that actually attempted to flash the BIOS. (Why do people attempt such things?).
@DrJ, DR-DOS/Caldera DOS are unrelated to "FreeDOS", which is a GPL DOS replacement project.. all 3 can probably be used, but the flashing utilities might depend on MS-DOS though.
One of my AMD computers has something called "EZFlash", the BIOS is protected from bad flashes, and it can be flashed without Windows or DOS. (via a special boot menu..).
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