Messages in this thread | | | Date | Wed, 09 Aug 2006 20:05:42 +0400 | From | Sergei Shtylyov <> | Subject | Re: libata pata_pdc2027x success on sparc64 |
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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
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