Hi, On Tuesday 01 May 2007, William Thompson wrote: > On Tue, May 01, 2007 at 09:04:46AM -0400, Mark Lord wrote: > > William Thompson wrote: > > > > > >+scsi2 : ata_piix > > >+ata_port_schedule_eh: port EH scheduled > > >+ata_scsi_error: ENTER > > >+ata_port_flush_task: ENTER > > >+ata_port_flush_task: flush #1 > > >+ata2: ata_port_flush_task: flush #2 > > >+ata2: ata_port_flush_task: EXIT > > >+ata_eh_autopsy: ENTER > > >+ata_eh_recover: ENTER > > >+ata_eh_prep_resume: ENTER > > >+ata_eh_prep_resume: EXIT > > >+__ata_port_freeze: ata2 port frozen > > >+ata_std_softreset: ENTER > > >+ata_std_softreset: about to softreset, devmask=1 > > >+ata_bus_softreset: ata2: bus reset via SRST > > >+ata_dev_classify: found ATA device by sig > > >+ata_dev_classify: unknown device > > >+ata_std_softreset: EXIT, classes[0]=1 [1]=5 > > >+ata_std_postreset: ENTER > > >+ata_std_postreset: EXIT > > >+ata_eh_thaw_port: ata2 port thawed > > >+ata_eh_revalidate_and_attach: ENTER > > >+ata2.00: ata_dev_read_id: ENTER, host 2, dev 0 > > >+ata_exec_command_pio: ata2: cmd 0xEC > > >+ata_hsm_move: ata2: protocol 2 task_state 1 (dev_stat 0x51) > > >+ata_hsm_move: ata2: protocol 2 task_state 3 (dev_stat 0x51) > > >+ata_port_flush_task: ENTER > > >+ata_port_flush_task: flush #1 > > >+ata2: ata_port_flush_task: flush #2 > > >+ata2: ata_port_flush_task: EXIT > > >+ata2.00: failed to IDENTIFY (I/O error, err_mask=0x1) > > >+ata_eh_revalidate_and_attach: EXIT > > .. > > > > Yep. Libata seems to be treating the ATAPI drive as ATA. > > > > Tejun, don't we have a fallback for when IDENTIFY fails? > > If the drive rejects it (err=0x04), then this can mean only one thing: > > unsupported command, so we next must try PACKET_IDENTIFY. > > Is it doing that just for this drive? I use libata on another machine (Dell > Dimension 2400) and it finds the cdrom just fine. > > The one thing I do know, the machine with the non-working libata cdrom also > does not work with the ide driver *ONLY IF* DMA is turned on. Please give 2.6.21 kernel w/ IDE subsystem and DMA enabled a try (2.6.21 kernel contains some important updates for both piix IDE driver and DMA tuning code). Also there is a newer firmware for this drive (PD03, your drive uses PD02), although the changelog doesn't say anything about DMA problems it wouldn't hurt to give it a try: http://support.us.dell.com/support/downloads/download.aspx?c=us&l=en&s=gen&releaseid=R20664&formatcnt=1&libid=0&fileid=20516 Thanks, Bart - To unsubscribe from this list: 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
