Re: IBM HDAPS things are looking up (was: Re: [Hdaps-devel] Re: [ltp] IBM HDAPS Someone interested? (Accelerometer))

[Shawn Starr]

It should be noted im using linux-2.6.git. 

--- Jens Axboe <axboe@xxxxxxx> wrote:

> On Fri, Jul 08 2005, Jon Escombe wrote:
> > Jens Axboe wrote:
> > 
> > >On Thu, Jul 07 2005, Shawn Starr wrote:
> > > 
> > >
> > >>Model: HTS548080M9AT00 (Hitachi)
> > >>Laptop: T42.
> > >>
> > >>segfault:/home/spstarr# ./a /dev/hda
> > >>head parked
> > >>
> > >>Seems to park, heard it click :)
> > >>   
> > >>
> > >
> > >Note on that - if the util says it parked, you
> can be very sure that it
> > >actually did as the drive actually returns that
> status outside of just
> > >completing the command.
> > > 
> > >
> > It's worth noting that you'll need the libata
> passthrough patch to make 
> > this work on a T43..
> > 
> > However, with this patch I'm getting the "head not
> parked 4c" message, 
> > but I can hear the click from the drive.. It takes
> around 350-400ms for 
> > the command to execute, but when repeated, it
> drops to around 5ms for a 
> > short while (with no audible clicking), before
> reverting to original 
> > behaviour after a few seconds.
> > 
> > The clicking and the variation in execution time
> lead me to think it is 
> > parking, but not being reported correctly?
> 
> Sounds like a pass through bug, it should pass the
> register output back
> out again for a non-data command.
> 
> Checking code... Yeah it does not. Since the 'we
> parked successfully' is
> stored in the lbal register, we need the full
> register set copied back
> into the buffer. That goes for all three HDIO_*
> commands, there's still
> some work to be done for the libata passthrough to
> be compliant with the
> ide one.
> 
> -- 
> Jens Axboe
> 
> 
> 
>
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