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From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Sun, 6 Jun 2010 14:09:48 +0000 (UTC)
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Subject: cvs commit: src/sys/dev/ata ata-all.h ata-lowlevel.c
 src/sys/dev/ata/chipsets ata-serverworks.c
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nwhitehorn    2010-06-06 14:09:48 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/ata          ata-all.h ata-lowlevel.c 
    sys/dev/ata/chipsets ata-serverworks.c 
  Log:
  SVN rev 208870 on 2010-06-06 14:09:48Z by nwhitehorn
  
  Some revisions of the Serverworks K2 SATA controller have a data
  corruption bug where if an ATA command is issued before DMA is started,
  data will become available to the controller before it knows what to do
  with it. This results in either data corruption or a controller crash.
  
  This patch remedies the problem by adopting the workaround employed
  by Linux and Darwin: starting the DMA engine prior to sending the ATA
  command.
  
  Observer on:    Xserve G5
  Reviewed by:    mav
  MFC after:      1 week
  
  Revision  Changes    Path
  1.154     +1 -0      src/sys/dev/ata/ata-all.h
  1.87      +10 -1     src/sys/dev/ata/ata-lowlevel.c
  1.14      +10 -0     src/sys/dev/ata/chipsets/ata-serverworks.c