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Subject: Re: alpha/75317: commit references a PR
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The following reply was made to PR alpha/75317; it has been noted by GNATS.

From: dfilter@FreeBSD.ORG (dfilter service)
To: bug-followup@FreeBSD.org
Cc:  
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)
     sys/alpha/alpha      busdma_machdep.c 
     sys/alpha/include    md_var.h 
     sys/alpha/pci        cia.c 
   Log:
   - 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
     cia(4).
   
   PR:             alpha/75317
   
   Revision   Changes    Path
   1.51.2.3   +23 -6     src/sys/alpha/alpha/busdma_machdep.c
   1.23.10.1  +1 -0      src/sys/alpha/include/md_var.h
   1.44.2.1   +1 -0      src/sys/alpha/pci/cia.c
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