On Thu, 06 Apr 2006 14:38:39 +0800, Albert Lee wrote: >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. Do we have any devices to test your patch with? Perhaps in Rochester? ++doug - : 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
