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SubjectRe: libata pata_pdc2027x success on sparc64
Hello.

Mikael Pettersson wrote:

> > The libata version has three improvements compared to the IDE version.
> >
> > 1. The PLL calibration patches in the above URLs (for IDE)
> > still need more improvement as done in the pdc_read_counter()
> > of the libata version.
> >
> > 2. The Promise 2027x adapters check the "set features - xfer mode"
> > and set the timing register automatically. However, the automatically
> > set values are not correct under 133MHz. Libata has a hook
> > pdc2027x_post_set_mode() to set the values back by software.
> >
> > 3. ATAPI DMA is supported (please see pdc2027x_check_atapi_dma()).
> > Maybe we also need to add this to the IDE version.

> Do you know how large the difference is between the 20267 (old driver)
> and the 20269 (new driver) in the areas touched by these patches?

Immense. They belong to the different families, register compatibe only in
the standard PCI/BM IDE regisrer set -- hence was the driver split.

> Long ago I tried a 20267 PCI card in my PowerMac, and it had the same
> issues that the 20269 card had. So I'm interested in porting the
> calibration/timing fixes to pdc202xx_old.c.

They don't apply to this driver at all. The "older" chip family didn't
have the PLL to calibrate. It must be some different issue.

> /Mikael

WBR, Sergei
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