Tejun Heo wrote: > Jeff Garzik wrote: > >> Albert Lee wrote: >> >>> Per Jeff's comment, there is a document on t13 >>> (http://www.t13.org/docs2003/e03131r0.pdf). >>> The documents reads: >>> "Eg. – Word 50, bit 13: Set to 1 for devices that support DMAIN bit >>> in Features Register for Packet Command". >>> However, this looks more for the ATAPI device than for the bridge? >>> Also it looks not a t13 standard yet? >>> Can we use this word 50 to identify 3611/3811? >> >> >> >> DMADIR is in my copy of ATA-7... >> > > Here's the relavant part from ATA8 draft. It seems that the bridge is > supposed to mangle the IDENTIFY PACKET DEVICE result. It's supposed to > nuke all DMA transfer mode information reported from the original device > and report supported modes from the view point of the bridge in bits > 10:1 (which, BTW, should be all 1's). > > The question is whether or not bridges implement this properly. I think > we can add a printk to word 62 and ask Jonathan to test it. > Ah, thanks for the info. The DMADIR is in my copy ATA-7, too. I just checked word 50 and overlooked it. :( I should have checked other part of the spec... Anyway, will try to make a patch based on the ATA-7 spec. -- Albert - : 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
