I am using a kirkwood-based CPU and u-boot 2013.07 (problem is probably not specific to the u-boot version).
When I program u-boot using jtag, I use the "oob_softecc_kw" option to write the image. U-boot boots fine and the bootROM register of the CPU shows no ECC errors.
When I flash the bootloader in u-boot (standard "nand write"), the wrong ECC algorithm is used, and the bootROM shows ECC errors (but u-boot boots fine as long as no bits flip in the flash).
I have already tried NAND_ECC_MODE default, rs and hamming in mkimage, with no success.
I guess I could read out the oob data with the correct ecc checksums from the image written by jtag and then use u-boots write.oob to flash the bootloader, but that seems to be an ugly workaround.
Any ideas?
Regards Thomas