On Llu, 2006-05-15 at 19:12 +0400, Sergei Shtylyov wrote: > For PIO2+ actually, according to Intel's PRM (29860004.pdf), and it's said > to have no effect in the lower modes. This is actually not very correct since > when one issues Set Transfer Mode ATA command with the value (8 + PIOn), this > means select PIO _flow control_ mode n, so -IORDY is assumed to be in use. PIO2 depends on the drive (there is a drive parameter telling you the highest timing clock you can do with/without IORDY > > I'm also not clear if the "no MWDMA0" list has been updated correctly > > for the newer chipsets. > > What is/was the point for keeping MW DMA 0 support anyway? On PIIX, it's > greatly slowed down (600 vs 480 ns cycle) and was never "offically" supported > by Intel. Some old old drives only do MWDMA0. The Intel docs I have here don't describe it in any way as "unsupported", merely broken on some ICH variants. Alan - : 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
