Sergei Shtylyov writes: > 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. OK, in that case let's forget about the 20267. It's not _that_ important :-) - : send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
