Messages in this thread | | | Date | Tue, 18 Jul 2006 22:07:44 +0400 | From | Sergei Shtylyov <> | Subject | Re: libata pata_pdc2027x success on sparc64 |
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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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