Messages in this thread | | | Date | Mon, 14 Jan 2008 17:22:03 -0500 | From | "David P. Reed" <> | Subject | Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override. |
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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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