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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