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On 4 Jun 1999, Kevin Buhr wrote:
> DAVID BALAZIC <david.balazic@uni-mb.si> writes:
> >
> > I tried the PIO autotuning feature of hdparm under kernel 2.3.3
> > with PIIX support. I have an Abit BH-6 board ( Intel BX chip set,
> > PIIX4, Teac CD532E-B secondary master )
This patch now does DMA/PIO tuning at the correct location.
> On a related note, using bootup autotuning with PIIX support under
> 2.3.5 (by providing an "ide0=autotune" boot argument) will cause an
> Oops.
This will work again now.
> The culprit is the "ide_wait_cmd()" call at the end of
> "piix_tune_drive()". The code in "ide-probe.c" that does bootup
> autotuning calls the interface's "tuneproc" before "init_irq()" (which
> assigns the drive to an "hwgroup") has been called. Therefore, the
> drive's "hwgroup" is still NULL, and after the call trace
> ide_wait_cmd->ide_do_drive_cmd->do_hwgroup_request, we crash when we
> try to lock on the "&hwgroup->spinlock".
I know an corrected that problem but it has not gotten there yet.
This patch will solve that issue.
> else? Or should bootup autotuning be abandoned altogether?
Nope, it is just a real pain to write code that you can not fully test.
I have now tested this code and it works.
Andre Hedrick
The Linux IDE guy
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