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Date: Sun, 11 Aug 1996 17:53:05 -0700 (PDT)
From: Bill Paul <wpaul>
Message-Id: <199608120053.RAA22001@freefall.freebsd.org>
To: CVS-committers, cvs-all, cvs-sys
Subject: cvs commit:  src/sys/i386/isa wd.c
Sender: owner-cvs-sys@FreeBSD.ORG
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wpaul       96/08/11 17:53:04

  Modified:    sys/i386/isa  wd.c
  Log:
  Apply my small patch to make detection of ATAPI CD-ROMs happen a
  little more reliably. So far I've received a couple of positive
  responses and no objections to these changes.
  
  There are two one-line changes:
  
  - In wdprobe(), when testing the error status of drives, don't
    unconditionally decide that there is no controller present if we
    read back a value of 0x81 (drive 0 okay, drive 1 failed) twice
    in a row. This may be caused by having an ATAPI CD-ROM jumpered
    as a master on the controller with no slave.
  
  - In wdgetctlr(), when checking for a status of WDCS_READY, check the
    value twice. The first time may be bogus. This stops a phantom wd2
    device from being detected when an ATAPI CD-ROM is attached to the
    secondary controller alone as a slave. (This can cause installation to
    fail when sysinstall attempts to open the phantom device and wedges the
    system as a result. This has bitten me a couple of times on some
    Gateway 2000 machines.)
  
  Revision  Changes    Path
  1.114     +11 -3     src/sys/i386/isa/wd.c