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From: Justin Piszcz <jpiszcz@lucidpixels.com>
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To: Mark Lord <liml@rtr.ca>
cc: Jeff Garzik <jgarzik@pobox.com>, Sander <sander@humilis.net>,
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       Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: LibPATA code issues / 2.6.15.4 (found the opcode=0x35)!
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References: <Pine.LNX.4.64.0602140439580.3567@p34> <44AEB3CA.8080606@pobox.com>
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I made my own patch (following Mark's example) but also added that printk 
in that function.

Jul  9 16:37:52 p34 kernel: [4294810.556000] ata_gen_fixed_sense: failed 
ata_op=0x35
Jul  9 16:37:52 p34 kernel: [4294810.556000] ata4: translated ATA stat/err 
0x51/04 to SCSI SK/ASC/ASCQ 0xb/00/00
Jul  9 16:37:52 p34 kernel: [4294810.556000] ata_gen_ata_desc_sense: 
failed ata_op=0x51
Jul  9 16:37:52 p34 kernel: [4294810.556000] ata4: status=0x51 { 
DriveReady SeekComplete Error }
Jul  9 16:37:52 p34 kernel: [4294810.556000] ata4: error=0x04 { 
DriveStatusError }

Now that we have found the ata_op code of 0x35, what does this mean?  Is 
it generated from a bad FUA/unsupported command from the kernel/SATA 
driver?

Justin.