"Maciej W. Rozycki" <[email protected]> writes:
> Hi Peter,
>
> > Does anybody know why we reserve this range of IO ports for 'fpu'?
> > AFAIK from all the IO maps I can find on the internet for various x86
> > chipsets only 0x00f0 is actaully ever used.
>
> There are two ports used: 0xf0 is the busy latch reset and 0xf1 is the
> coprocessor reset. They are legacy ports resulting from the interesting
> way the FPU has been wired by IBM in their PC design.
Was it really needed on 386s? I didn't think there was a IBM 386 PC.
> None of them is
> used by Linux for i486 and newer systems, which can support the FPU in its
> native configuration.
I can remove it from x86-64 at least.
-Andi
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