----- Original Message -----
From: "Alexander Motin" <m...@freebsd.org>
> is 00000000 cs 00000000 ss 00000001 rs 00000001 tfd 40 serr 00880000
This line (ss and rs fields) tells me that device haven't confirmed
completion of one NCQ command. Bits set in serr field mean "10b to 8b
Decode Error" and "Link Sequence Error". I would suggest that something
wrong with the link quality. That may explain why reducing speed helps.
Thanks Alexander, that's most helpful, will continue with testing to try and
narrow down the issue based on that info :)
Regards
Steve
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