On 19/01/10 08:21, fgd wrote: > > Hi everyone, > I've recently been playing with an omap3 beagle board and I've found a > problem that I think involves the reading of nand memory... > I have recompiled u-boot for the beagle board (I just changed its prompt, as > a simple test to check that it's my u-boot and not the one that was there > before, and I used the default configs for the beagle), then I have loaded > u-boot and the x-loader into flash, and I have succesfully rebooted and seen > 'my' u-boot prompt... > after that, I wanted to load a linux kernel and a file system into nand > flash, instead of using the external memory card (if I boot a kernel stored > there, it works), so I go and load an uImage into flash, then read it back > to RAM, and boot from there, and it still works, BUT, as soon as I reset the
Maybe you do this after running Linux and Linux has configured the SoC to access the NAND? Can you use u-boot to write to NAND after a reset, but before Linux boots? > OMAP, when it tries to copy the kernel data stored in flash into RAM to boot > from it, the nand reading operation will fail, and if I try to boot that > kernel it will complain about a CRC checksum error... After a reset, I guess your UBL (and u-boot) is not enabling NAND accesses? I added some code to the Davinci nand driver to fix a similar issue on that arch. > the exact error looks like this: > # nand read ${loadaddr} 280000 400000 u-boot's nboot command can read the uImage header and copy from NAND only the required amount of data. It only copies to RAM, so you still need to bootm... > > NAND read: device 0 offset 0x280000, size 0x400000 > NAND read from offset 280000 failed -74 > > note that this just happens after I reset the board... I thought it could be > a hardware problem with my board, but I've tried in a different board (an > omap3 evm) and I'm getting the same thing, so I think I might be missing > something... > has anyone of you tried something like this or has encountered any similar > problem? any help will be greatly appreciated, if you need any extra info > about what I have done just tell me... > thanks a lot in advance, regards > > Fernando Nick _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot