Re: More info on IDE lockup after APM restore

From: Andre Hedrick (andre@linux-ide.org)
Date: Fri Apr 14 2000 - 02:48:19 EST


On Fri, 14 Apr 2000, Jeremy Fitzhardinge wrote:

>
> Earlier I reported that after an APM restore from disk, the HD locks
> up (light solid on) on the first access; after a while it reports:
> hda: timeout waiting for DMA
> ide_dmaproc: chipset supported ide_dma_timeout func only: 14
>
> I found that disabling CONFIG_PIIX_TUNING fixes this, and it can save and
> restore without problems.
>
> What does PIIX_TUNING do, and should I expect it to work for me?
> My setup is a Sharp Actius A-100 laptop running 2.3.99pre5.

It corrects the timing aspects of the chipset for BIOS screw ups on
DeskTops and Servers.......but is completely untested on Laptops.....
I qualify this to the level has tests that are known and stable.

I suspect that it would STOMP all over saved APM setting in the BIOS.
Thus I need to have it disabled when APM is enabled.

Andre Hedrick
The Linux ATA/IDE guy

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