fpu IO port reservation (arch/i386)

From: Peter Fordham
Date: Fri Sep 21 2007 - 09:22:55 EST


Hi,

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.

./arch/i386/kernel/setup.c
282 }, {
283 .name = "fpu",
284 .start = 0x00f0,
285 .end = 0x00ff,
286 .flags = IORESOURCE_BUSY | IORESOURCE_IO
287 } };

The reason I ask is that I've written a watchdog driver for a Nexcom
MAX6600 server blade type device which has the watchdog control
register at 0xF2. Currently request_region fails due to the fpu
reservation.

regards,

Pete Fordham
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