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authorH. Peter Anvin <hpa@zytor.com>2009-05-21 11:46:16 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-05-22 11:14:02 -0700
commitbca23dba760d6705c013f89113c46570378fb626 (patch)
tree31f52293a54d418ff347e7de20ffc702acf554be /Documentation
parent88dff4936c0a5fa53080cca68dc963a8a2a674b0 (diff)
downloadlinux-bca23dba760d6705c013f89113c46570378fb626.tar.bz2
x86, setup: revert ACPI 3 E820 extended attributes support
Remove ACPI 3 E820 extended memory attributes support. At least one vendor actively set all the flags to zero, but left ECX on return at 24. This bug may be present in other BIOSes. The breakage functionally means the ACPI 3 flags are probably completely useless, and that no OS any time soon is going to rely on their existence. Therefore, drop support completely. We may want to revisit this question in the future, if we find ourselves actually needing the flags. This reverts all or part of the following checkins: cd670599b7b00d9263f6f11a05c0edeb9cbedaf3 c549e71d073a6e9a4847497344db28a784061455 However, retain the part from the latter commit that copies e820 into a temporary buffer; that is an unrelated BIOS workaround. Put in a comment to explain that part. See https://bugzilla.redhat.com/show_bug.cgi?id=499396 for some additional information. [ Impact: detect all memory on affected machines ] Reported-by: Thomas J. Baker <tjb@unh.edu> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Acked-by: Len Brown <len.brown@intel.com> Cc: Chuck Ebbert <cebbert@redhat.com> Cc: Kyle McMartin <kmcmartin@redhat.com> Cc: Matt Domsch <matt_domsch@dell.com>
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