On Mon, 12 Sep 2005, Dave Memmott wrote: > Hi, > > I'm trying to implement the USB mass storage class (Kernel 2.4.6 and > Cypress EZ-OTG CY767200 controller)and I'm having problems reading the > boot sector on my USB Flash drive when I mount it.
What's the connection between the Cypress controller and your flash drive (which appears to be a SanDisk Cruzer Titanium)? > Here's how I mount the thumb drive: > mount -t vfat /dev/sda1 /files > (there isn't anything in /files directory) > > Here's what it returns: > fatfs: bogus logical sector size 20487 > VFS: Can't find a valid MSDOS filesystem on dev 08:00. Shouldn't that be 08:01 for /dev/sda1? 08:00 is /dev/sda. Maybe you're trying to mount the wrong device file. > I've tracked it down to the fat_read_super() function in fat_inode.c > when it tries to read (bread()) the first sector (0) on the drive. The > contents of the read don't look anywhere close to what I read when I use > a separate program in WinXP to read the first sector which is correct. Could the partition table be messed up? Check to make sure partition 1 starts at the correct sector. > I suspect that the USB and SCSI subsystems don't have any problems > because it reports the thumb drive correctly as you can see below. > > scsi0 : SCSI emulation for USB Mass Storage devices > Vendor: SanDisk Model: Cruzer Titanium Rev: 0.4 > Type: Direct-Access ANSI SCSI revision: 02 > Detected scsi removable disk sda at scsi0, channel 0, id 0, lun 0 > SCSI device sda: 2001888 512-byte hdwr sectors (1025 MB) > sda: Write Protect is off > Partition check: > sda: sda1 > WARNING: USB Mass Storage data integrity not assured > USB Mass Storage device found at 3 > > > I'm stumped! Anyone else come across this problem? > > Or can you point me in the right direction? > > I've tried a couple of different flash drives with the same result. In > fact the ASCII represent of the sector read has the following text, > "Invalid partition table. Error loading operating sytem . Missing > operating system." I don't know if means anything and I can't find it > anywhere in the source code. In what source code? That message is exactly what you should expect to see if you're reading the first sector of /dev/sda -- it belongs to the partition sector. > The mass storage debug printf's (see below) indicate that it's using > Bulk transport and Transparent SCSI protocol. Anyone know where I can > find 'Transparent SCSI' command set documentation? There is _no_ documentation for the Transparent SCSI command set. The phrase doesn't really mean anything -- it's just the set of SCSI commands that were commonly recognized at the time the USB Mass Storage spec was written. Alan Stern ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
