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From: Alexander Motin <mav@FreeBSD.org>
Date: Thu, 21 Apr 2011 20:56:34 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/dev/ata/chipsets ata-intel.c
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mav         2011-04-21 20:56:34 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/ata/chipsets ata-intel.c 
  Log:
  SVN rev 220929 on 2011-04-21 20:56:34Z by mav
  
  According to ATA specifications, when ATAPI master is the only device, it
  should respond with all zeroes to any access to slave registers. Test with
  PATA devices confirmed such behavior. Unluckily, Intel SATA controllers in
  legacy emulation mode behave differently, not making any difference between
  ATA and ATAPI devices. It causes false positive slave device detection and,
  as result, command timeouts.
  
  To workaround this problem, mask result of legacy-emulated soft-reset with
  the device presence information received from the SATA-specific registers.
  
  Revision  Changes    Path
  1.26      +21 -11    src/sys/dev/ata/chipsets/ata-intel.c