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On 06/13/2013 08:15 AM, Heiko Schocher wrote:
Hello,
I just tried to write with "dfu" and dfu-util on the host to a not empty partiton on a nand flash. After the dfu returned without error, I wanted to read the nand partiton with "nand read" and I get ECC errors. This is on an am335x based board (mainline patches coming soon) with ECC BCH8 enabled...
[snip]
Is this a bug or a feature?
If it is a bug, I fixed it as I added in my tree in drivers/mtd/nand/nand_util.c a nand_erase_write_skip_bad() function, which erases before writes to "off, length" ... and call this function in drivers/dfu/dfu_nand.c nand_block_op() instead nand_write_skip_bad() ... Is this a possible solution?
So yes, if you don't erase first, just like doing a nand write from the command line, it will fail. This is arguably a bug. But, I would go for making dfu_nand spell out a call to an existing erase function since we know the size of the alt setting to be written to.
- -- Tom