"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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
