On Tue, 3 May 2005, Grégory SCHMITT wrote: > Hello, > > I have a no-name USB mp3 player coming with 128 MB. > > Vendor: Winbond Electronics Corp. 0x0416 > Product: CT986 0xc986 > > It works fine under windows: sometimes data corruption will occur, but > that remains rare and reading/writing speed is decent. > > Pluging it the first time under linux didn't work at all. A lot of > errors like "SCSI error : <0 0 0 0> return code = 0x10070000". > Partition table wasn't recognized at all. > > It was natively not working with kernel 2.6.11, so I decided to hack > the unusual_devs.h. I added those line: > > UNUSUAL_DEV(0x0416, 0xc986, 0x0100, 0x0100, > "Winbond Electronics Corp.", > "CT986", > US_SC_DEVICE, > US_PR_BULK, > NULL, > US_FL_IGNORE_RESIDUE | US_FL_FIX_INQUIRY | US_FL_NEED_OVERRIDE), > > All switches are required, device seems to accept only Bulk according > to the Windows driver.
The switches are _not_ all required. Instead of US_PR_BULK you should have US_PR_DEVICE, and you should omit US_FL_NEED_OVERRIDE. Also I doubt that US_FL_FIX_INQUIRY is needed. To justify having it, you should post usb-storage verbose debugging logs showing what happens when you plug in the device, both with and without the FIX_INQUIRY flag present. > Adding those lines helped a lot: key is recognized correctly (sda1), and > reading files is fine. > > However, writing always fails, with such error messages (tons of them): > > SCSI error : <0 0 0 0> return code = 0x10070000 > end_request: I/O error, dev sda, sector 400 > Buffer I/O error on device sda1, logical block 0 > > (sector and logical block changing in each message). > > I tried to add the "sync" option in the fstab, and it wil copy files, > but for no more than 2048 bytes. > > I tried to decrease the max_sectors to 8, helped only for littles > files. Bigger files will be corrupted. > > I tried latest patch regarding ignoring residue for read and write > operations, it somehow helped as all those error message are gone and > files are copied without problem, but it is horribly slow (transfer > rate around 20 kb/s at best), which makes mp3 transfers a real pain. > > Any idea ? Will 2.6.12 provide a solution ? It sounds like the ignore-residue-for-writes patch fixed your problem. The patch will be included in 2.6.12. The reason for the your slow transfers is probably that you are still using the "sync" option. Alan Stern ------------------------------------------------------- This SF.Net email is sponsored by: NEC IT Guy Games. Get your fingers limbered up and give it your best shot. 4 great events, 4 opportunities to win big! Highest score wins.NEC IT Guy Games. Play to win an NEC 61 plasma display. Visit http://www.necitguy.com/?r=20 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
