Re: libata pata_pdc2027x success on sparc64

[Sergei Shtylyov]

Hello.

Mikael Pettersson 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:

http://marc.theaimsgroup.com/?t=110992452800002&r=1&w=2
http://marc.theaimsgroup.com/?t=110992471500002&r=1&w=2
http://marc.theaimsgroup.com/?t=110992490100002&r=1&w=2
http://marc.theaimsgroup.com/?t=111019238400003&r=1&w=2

   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?

WBR, Sergei

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