Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port 0x80I/O delay override.
From: David P. Reed
Date: Mon Jan 14 2008 - 17:29:59 EST
David Woodhouse wrote:
On Fri, 2008-01-11 at 09:35 -0500, David P. Reed wrote:
Using any "unused port" for a delay means that the machine check
feature is wasted and utterly unusable.
Not entirely unusable. You can recover silently from the machine check
if it was one of the known accesses to the 'unused port'. It certainly
achieves a delay :)
I'm sure that's what the driver writers had in mind. ;-)
And I think we probably have a great shot at getting Intel, Microsoft,
HP, et al.. to add a feature for Linux to one of the ACPI table
specifications that define an "unused port for delay purposes" field in
the ACPI 4.0 spec, and retrofit it into PC/104 machine BIOSes. At least
Microsoft doesn't have a patent on using port 80 for delay purposes. :-)
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