Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

[H. Peter Anvin]

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