Date: Sat, 31 Oct 2009 17:06:36 +0000 (UTC) From: Stefan Esser <se@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/dev/sym sym_hipd.c Message-ID: <200910311706.n9VH6qf0000298@repoman.freebsd.org>
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se 2009-10-31 17:06:36 UTC
FreeBSD src repository
Modified files:
sys/dev/sym sym_hipd.c
Log:
SVN rev 198719 on 2009-10-31 17:06:36Z by se
While certain supported Symbios/LSI SCSI chips (532c896, 53c1000, 53c1010)
do support 64bit addresses, the current SCRIPTS code supports only 32bit
addresses causing data corruption for buffer addresses >4GB. This problem
affects 64bit machines with more than 4GB RAM or amd64 with 4GB and
memory hole remapping.
Work-around this problem with a bus_dma tag that requests bounce-buffers
for addresses >4GB. This causes some overhead, but given the maximum SCSI
bus speed of 160MB/s compared, the effect should hardly be noticeable.
The problem was reported by Mike Watters (mike at mwatters net) who also
verified that this fix cures the problem.
Since this change is a NOOP on systems with less than 4GB RAM and fixes
data corruption (in RAM and on disk) on systems with more than 4GB, I hope
that this change is accepted for 8.0.
MFC after: 3 days (pending approval)
Revision Changes Path
1.73 +1 -1 src/sys/dev/sym/sym_hipd.c
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