[PATCH] option to re-enable aggressive ATA probing (was: 5.3 -> 5.4 breaks ATA (Intel ICH2))

From: Tim Howe (tim.howe_at_celebrityresorts.com)
Date: 09/27/05

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    To: freebsd-stable@freebsd.org
Date: Tue, 27 Sep 2005 02:07:23 -0400

    Tim Howe <tim.howe@celebrityresorts.com> writes:

    > ata0-master: stat=0xd0 err=0xd0 lsb=0xd0 msb=0xd0

    This turned out to be the key.

    Version 1.51 of ata-lowlevel.c added a check for stat0/1, err, lsb, and
    msb being identical. If they are, it aborts the probe. The attached
    patch creates an option ATA_AGGRESSIVE_PROBE which disables this for the
    old aggressive behavior (which may wait up to the full 31 seconds).

    I also took the liberty of reworking the still-busy check from 3
    equality tests to 2 bitmask tests. It seems simpler to my eye with
    identical results, but if I missed something or the other style was
    preferred please let me know.

    The patch is against 5-STABLE because that's what I have. 

    -- 
Tim Howe
Software Engineer
Celebrity Resorts, Inc.

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