Hi

commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e
Author: Jens Axboe <jens.axboe@oracle.com>
Date:   Wed Oct 22 09:34:49 2008 +0200

    libata: switch to using block layer tagging support


This kernel can not read even 0 sector on disk with rootfs. It
initialized disk, but cant read it at all.
 CMD646 on Sparc

Rverting helped.
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