From: l.ping...@gmail.com [mailto:l.ping...@gmail.com] On Behalf Of Remy Bohmer Sent: Monday, June 01, 2009 12:04 PM To: Barnes, Clifton A. Cc: u-boot@lists.denx.de Subject: Re: [U-Boot] Large Block USB Flash Drive Problem
> 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 Remy, Do you know if anyone is actively working on this issue? I tried applying the patch to the most recent U-Boot but it doesn't apply cleanly. If no one is working on it, I might try to take a look at updating the patch and fixing the issue. Is this not a big issue with people using USB flash drives? It seems I'm running into more and more "large block" flash drives. Also, while clicking around the Git repo, I noticed that USB Ethernet support for the AT91 micros was added to U-Boot development. How far along is the USB Ethernet support? Is it something that can be tested now? Thanks, Clif _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
