Re: [PATCH #upstream-fixes] libata: implement libata.force_cbl parameter

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Alan Cox wrote:
>> This only forces PATA controllers to certain cable type.  It's a last
>> resort method for installation or live media - just enough to get things
>> going.
> 
> In which case we only need to be able to force UDMA33 or less ?

Cable detection goes wrong and 40c is detected as 80c.  However, we got
(un)lucky and all PIO and short transfers succeed however when large
UDMA transfer starts, the drive detects transmission error and
unfortunately does the right thing - reports transmission error via
check sense.  libata EH currently doesn't analyze sense data and
simplify passes it to sr.  sr knows transmission failure occurred but
there isn't much it can do.

-- 
tejun
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