Messages in this thread | | | From | Matthieu castet <> | Subject | Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override. | Date | Wed, 9 Jan 2008 21:01:30 +0000 (UTC) |
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Hi,
David P. Reed <dpreed <at> reed.com> writes:
> And actually, if I had looked at the /sys/bus/pnp definitions, rather > than /proc/ioports, I would have noticed that port 80 was part of a > PNP0C02 resource set. That means exactly one thing: ACPI says that > port 80 is NOT free to be used, for delays or anything else.
I have some computers where port 0x80 is claimed by 8237A DMA controller [1] But in this case it seems a lasy acpi programmer that doesn't want to convert the hole in 0x80-0x8f range...
PS : I post from gmane web interface, so I can't keep CC.
[1] This happen with a old 7 years old siemens PIII and a new hp core2duo. state = active io 0x0-0xf io 0x80-0x8f io 0xc0-0xdf dma 4
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