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SubjectRe: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
David P. Reed wrote:
>
> Note that I can run the port 80 test once, the second time I get the
> hard freeze. I didn't try writing to port 70 from userspace - that
> one's dangerous, but the reading of it was included for a timing typical
> of a chipset supported device. These are all pretty consistent.
>
> I find the "read" timing from 0x80 verrrrry interesting. The write
> timeing is also interesting, being faster than an unused port.
>

Once again: reading from port 0x80 goes to the DMA page device.

-hpa


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