[OpenBIOS] Documentation on 0xcfe IO port?
Ronald G. Minnich
rminnich at lanl.gov
Wed Feb 16 13:11:24 CET 2000
On Wed, 16 Feb 2000, Wallace I. Kroeker wrote:
> ; turn on the dram and wait a while (this from the intel book)
> mov dx, 0xcf8
> mov eax, 0x80000074
> out dx, eax
> mov dx, 0xcfe
Yeah, this is cute. Basically you put a word-aligned address in cf8. Then
to get to reg. 76 you do an out to 0xcfe, which offsets the 74 to 76.
Look in the ALI chipset directory in openbios: they have a nice macro
there that shows how this works.
ron
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