Maybe run: lsusb -v and compare the output for the difference SanDisk Cruzer USB devices if they're identical or different.
On Thu, Mar 1, 2012 at 12:38 AM, Dave Frodin <[email protected]> wrote: > I'm a new subscriber to seabios.org so feel free to straighten me out if > needed. > > I've been debugging an problem we've been seeing with not being able to boot > (Ubuntu specifically) off > of a variety of "newer" USB thumb drives. I've been specifically looking at > an older/newer pair of > Sandisk Cruzer 4GB drives. I've been adding dprintf's to narrow down the > problem to the blockcmd.c file. > The function scsi_init_drive() queries the USB device to determine stuff like > vendor/device/size/etc. > Near the end of the function is a call to cdb_mode_sense_geom(&dop, > &geomdata) to retrieve the info > related to cyl/head type stuff. On the older/working thumbdrive it returns > zeroes for all of the values > that get used by the code. The newer/failing drive generates a "stall" on the > USB bus, which it never > recovers from. The cdb_mode_sense_geom() function is sending a SCSI CDB Mode > Sense (CMD=0x5A) to the device. > > As a hack of a test, I removed the call to cdb_mode_sense_geom() and filled > the buffer it should have returned > with zeroes and the failing thumbdrive now boots. > > I have some searching I need to do to find out... > 1) Is there a SCSI command to determine what protocols are supported? > 2) Is there another SCSI command that might return similar required data? > > Has anyone out there experienced similar booting difficulties? > Or does anyone have any recommendations on what approach I should take? > > thanks, > Dave > > _______________________________________________ > SeaBIOS mailing list > [email protected] > http://www.seabios.org/mailman/listinfo/seabios _______________________________________________ SeaBIOS mailing list [email protected] http://www.seabios.org/mailman/listinfo/seabios
