Brandon Low wrote: > I'm having some weirdness during boot with my optical drives on 2.6.20. > > ata2.00: ATAPI, max UDMA/33 > ata2.01: ATAPI, max UDMA/33 > ata2.00: qc timeout (cmd 0xef) > ata2.00: failed to set xfermode (err_mask=0x4) > ata2.00: limiting speed to UDMA/25 > ata2: failed to recover some devices, retrying in 5 secs > ata2.00: configured for UDMA/25 > ata2.01: configured for UDMA/33 > > the 4 lines starting with qc timeout _would_ repeat with lower speeds > until the drive was finally disabled and then do the same for 2.01, > except that on this particular attempt, I had the thought to eject both > optical drives while it sat there. Boot then proceeded normally and the > drives appear to work. > > Intuitively this seems to indicate that the drives aren't being sent > some kind of wake-up call before their transfer modes are set. > > The motherboard is an ASRock 939 Dual SATA II. >
In my case of relatively old ALi chipset CD-ROM was never detected if DMA is allowed. Unfortunately this remained mystery for quite some time. Legacy IDE drivers are working just fine; it is only pata_ali that failes :( See e.g. http://marc.theaimsgroup.com/?l=linux-kernel&m=116500554505311&w=2 (2.6.19: ALi M5229 - CD-ROM not found with pata_ali) if you have any idea how to debug it ... -andrey > Let me know if there is any more information that I can provide. > > Thanks, > > Brandon Low - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
