Re: PATA ATAPI detection debug

["Art Haas" <ahaas@airmail.net>]

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On Tue, Jan 23, 2007 at 03:30:03PM +0900, Tejun Heo wrote:
> Tejun Heo wrote:
> > Hello, all.
> > 
> > Many people have been reporting libata PATA ATAPI detection problem.  In
> > many but not all cases, the ATAPI device was occupying the slave slot
> > while a disk drive occupies the master slot.  Based on that and J.
> > Taimr's nullify freeze on via fix, I made a cocktail patch which
> > contained four different fixes and it seemed to have fixed the problem
> > for (at least) several people, but the reports are not all consistent.
> > 
> > The attached patches contain the same four fixes but has a selector
> > parameter to enable each fix separately.  Both are equivalent but using
> > 2.6.20-rc5 is recommended to rule out detection problems fixed by
> > polling IDENTIFY.
> > 
> > If your libata driver is compiled into the kernel, add
> > 'libata.debug_cocktail=N' to your kernel parameter.  If you compile
> > libata.ko as module, add 'debug_cocktail=N' module parameter to the
> > module parameter.  e.g. 'modprobe libata.ko debug_cocktail=1'.
> 
> Daniel Fraga and Sero's cases are different issue while I can't
> determine whether J. Taimr's case is limted on via chipset.  So, I need
> more input to proceed.
> 
> *Please* test and report the results.
> 
> Thanks.
> 
> -- 
> tejun

Hi.

I got a chance to test your patches yesterday. Enclosed is the 'dmesg'
output for tests of 'debug_cocktail' values of 1,2,4,8,5,9,6, and 10.
My machine booted successfully each time, but the CD-ROM drive was
never detected.

Sorry it took a while to get to testing. Hope the enclosed info provides
you with useful clues in solving the problem.

Art Haas
-- 
Man once surrendering his reason, has no remaining guard against absurdities
the most monstrous, and like a ship without rudder, is the sport of every wind.

-Thomas Jefferson to James Smith, 1822

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