Hello, 2009/5/28 Barnes, Clifton A. <cabar...@indesign-llc.com>: > I have been trying out loading the Linux kernel using a USB > flash drive in the u-boot-2009.06-rc2 release and ran into a problem > with one of my flash drives. This particular drive has a block size of > 2048 while the other drives have block sizes of 512. The drives with a > block size of 512 work perfectly. However, the flash drive with a block > size of 2048 fails during the 'usb start' command. I traced this issue > to the Part_dos.c file and the function test_part_dos. The buffer > allocated there is only 512 bytes. When I changed it to 2048, the 'usb > start' command worked correctly and found the one storage device > connected. This had no adverse affect with the flash drives that were > 512 bytes. Should the macro DEFAULT_SECTOR_SIZE be changed to > accommodate larger block size usb flash drives? > > The second problem came when I tried to use the FAT utilities. > When I ran 'fatls usb 0', it failed the same way as when the 'usb start' > failed before. Naturally, I guessed that it was a buffer size problem > again. I was able to trace the issue to the macro SECTOR_SIZE in fat.h. > I tried changing it to 2048, however, there is a check right below it > that fails if SECTOR_SIZE != FS_BLOCK_SIZE. So, I assume that the > support isn't written to handle sector sizes that are different than the > FAT block size. However, I went ahead and changed them both to 2048. > This fixed the issues with the FAT utilities partly. I was able to run > 'fatls usb 0' and it listed the files but also some junk. I'm guessing > it was grabbing junk after the files since the block size is too big. I > was also able to run 'fatload usb 0 0x22000000 uImage' successfully and > boot the kernel successfully. So, I think the fix has to be in the > SECTOR_SIZE macro in the fat.h file. Can anyone with expertise in the > FAT implementation take a look at supporting different sector sizes for > larger block size flash drives?
Well, there was a patch posted for this some time ago: http://www.mail-archive.com/u-boot@lists.denx.de/msg05444.html But, this patch broke several 512 byte blocksize devices, so I did not push it to mainline. You might take a look at it, maybe it solves your problem. If you can make it work properly with 512 byte devices as well, I am in for a patch... Kind Regards, Remy _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot