Re: libata pata_pdc2027x success on sparc64

From: Mikael Pettersson
Date: Tue Jul 18 2006 - 20:28:41 EST

On Tue, 18 Jul 2006 22:07:44 +0400, Sergei Shtylyov wrote:
>> In contrast, the old IDE pdc202xx_new driver had lots
>> of problems with CRC errors causing it to disable DMA.
> Hm, from my experience it usually falls back to UltraDMA/44 and then the
>thing startrt working...
>> I wasn't able to manually tune it above udma3 without
>> getting more errors. This isn't sparc64-specific: I've
>> had similar negative experience with the old IDE Promise
>> drivers in a PowerMac.
> This happens because the "old" driver misses the PLL calibration code.
> You may want to try these Albert's patches:
> It looks like they were never considered for accepting into the kernel
>while they succesfully solve this issue. Maybe Albert could try pushing them
>into -mm tree once more?

Thank you for these links. After fixing up whitespace damage in
these four messages the patches applied OK and more importantly
eliminated _all_ misbehaviour from pdc202xx_new on both my sparc64
and my PowerMac.

These fixes belong in Linus' kernel, not some semi-obscure
mailing list archive.

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