Date: Sat, 16 Jan 1999 11:48:02 -0800 (PST) From: Bruce Evans <bde@FreeBSD.ORG> To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: cvs commit: src/sys/pci ide_pci.c Message-ID: <199901161948.LAA00418@freefall.freebsd.org>
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bde 1999/01/16 11:48:01 PST
Modified files:
sys/pci ide_pci.c
Log:
Fixed a 1-bit error in initializing UDMA mode for VIA chipsets.
Instead of initializing UDMA mode, we turned it off and made sure that
it stays off by turning on the "UDMA enable by SET FEATURES" disable.
The damage was limited by bugs in cookie lookup, and suitable
initialization by some BIOSes. The cookie list has slaves before
masters, and the unit number is ignored when cookies are looked up,
so cookie lookup always finds cookies for slaves and the bug only
clobbers slaves, so the bug was harmless for common configurations
with no slaves or only non-UDMA slaves. UDMA initialization for
masters actually worked if the BIOS turns on the UDMA mode bit and
turns off the "UDMA enable by SET FEATURES" disable.
Revision Changes Path
1.26 +2 -2 src/sys/pci/ide_pci.c
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