That is because one could enable the chipset with out AUTODMA and then
try, but crash the system, to retune the drive but the chipset is still
set at PIO 0. Thus attempting to do DMA transfers from the drive to a
PIO 0 configured host adapter will CRASH........
This will be fixed or is pixed in 2.3.99pre2
On Sun, 19 Mar 2000, Ove Ewerlid wrote:
> Matthew Cordes wrote:
> >
> > Hello,
> > I have a Promise Ultra66 and the only 2.3.x kernel I can get it to work
> > with is kernel 2.3.34. All newer kernels hang while recognizing the
> > drive after a reboot. I could not find any relevant info in my logs, but
> > I have tried a number of other options to see if somehow that would make
> > a difference. They did not. If you would be so kind, please forward
> > this to the individual responsible for maintaining this code. Thank you.
>
> I first saw this problem in 2.3.51 (possibly earlier).
> The problem is there for the promise controller types 20246 and 20262.
> I can boot the systems by not compiling with DMA and not enabling DMA
> during runtime.
> Enabling DMA during runtime freezes the system instantly when drives on
> the promise controllers are accessed..
>
> Ove
>
> --
> Ove Ewerlid
> Email: Ove.Ewerlid@[syscon|signal|material].uu.se
> Phone: +46 70 666 23 63, Fax: +46 18 503 611, +46 18 555 096
>
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>
Andre Hedrick
The Linux ATA/IDE guy
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