cvs commit: src/sys/dev/sound/pci ich.c

[Ariff Abdullah]

ariff       2007-05-05 09:18:05 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/sound/pci    ich.c 
  Log:
  Fix (or rather workaround) Intel 440MX Errata #36
  - http://www.intel.com/design/chipsets/specupdt/245051.htm
  
  AC97 Soft Audio and Soft Modem Master Abort Errata
  
  Issue:
    Use of either soft audio or soft modem on an Intel® 82443MX PCISet
    based platform running a 100 MHz Processor System Bus and an AC97 codec
    may result in failures. The system continues to function normally while
    the AC97 hardware may not resume and may require a cold-boot to
    recover. As a result of the failure, the Master Abort Status bit will
    be set in the audio or modem function PCI header space.
  
  Workaround:
    Force uncacheable DMA on both BDL and pcm buffers.
  
  Tested by:      Emil Holmstr|m <emil at linux.se>
  
  Revision  Changes    Path
  1.75      +116 -58   src/sys/dev/sound/pci/ich.c