Date: Thu, 5 Aug 2004 06:54:16 +0000 (UTC) From: Nate Lawson <njl@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/dev/acpica acpi_pci_link.c Message-ID: <200408050654.i756sGme057642@repoman.freebsd.org>
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njl 2004-08-05 06:54:16 UTC
FreeBSD src repository
Modified files:
sys/dev/acpica acpi_pci_link.c
Log:
Work around non-compliant BIOS PCI link devices. Some systems have the
following behavior:
* Link devices return invalid status (_STA) values. The results are very
unreliable -- sometimes never present. Just ignore the status and pick
the best configuration from _PRS.
* Link devices return invalid current settings (_CRS). Even after setting
the link value, many systems still return a different setting for _CRS.
When setting an IRQ, don't bother to check _CRS to see if we succeeded.
Note that we still check _CRS before routing and this should be addressed
as well.
Since this is a sensitive area, leave the old behavior accessible via
uncommenting the define for ACPI_OLD_PCI_LINK at the top of the file. Once
this has been thoroughly tested, this option and the code it covers will
be removed.
Thanks to Len Brown at Intel for informing us of these issues as he worked
around them in Linux.
Revision Changes Path
1.17 +31 -0 src/sys/dev/acpica/acpi_pci_link.c
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