alpha/75317: commit references a PR
dfilter at FreeBSD.org
Mon Dec 10 12:20:02 PST 2007
The following reply was made to PR alpha/75317; it has been noted by GNATS.
From: dfilter at FreeBSD.ORG (dfilter service)
To: bug-followup at FreeBSD.org
Subject: Re: alpha/75317: commit references a PR
Date: Mon, 10 Dec 2007 20:14:23 +0000 (UTC)
jhb 2007-12-10 20:14:16 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_6)
- Add a workaround for the DMA bugs on some alpha chipsets that ATA DMA
trips over often. Specifically, in these chipsets DMA transfers that
cross a page boundary result in data corruption. The workaround is to
not allow any DMA transfers for non-static DMA maps (i.e. "real"
transfers as opposed to work areas allocated with bus_dmamem_alloc()) to
cross a page in a single S/G element. This behavior is enabled by
setting 'busdma_pyxis_bug' to 1.
- Add a new tunable 'machdep.busdma_pyxis_bug' that can be used to enable
the workaround from the loader. This can be used to enable it on
chipsets where we don't automatically enable it.
- Auto-enable the workaround for buggy PYXIS 1 chipsets supported via
Revision Changes Path
126.96.36.199 +23 -6 src/sys/alpha/alpha/busdma_machdep.c
188.8.131.52 +1 -0 src/sys/alpha/include/md_var.h
184.108.40.206 +1 -0 src/sys/alpha/pci/cia.c
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