Matthias Huber wrote: > No, erasing seemed not to be necessary. > why should i erase it ?
Because a write to NAND normally only clears bits but never sets them: # flash_eraseall /dev/mtd4 # hexdump -C /dev/mtd4 00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| # echo -en '\x0f' | dd bs=1024 count=1 conv=sync >/dev/mtd4 # hexdump -C /dev/mtd4 00000000 0f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |?...............| # echo -en '\xff' | dd bs=1024 count=1 conv=sync >/dev/mtd4 dd: writing `standard output': Input/output error # hexdump -C /dev/mtd4 00000000 0f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |?...............| Here's a little brain-twister: repeat the example from the beginning, but instead of trying to write '\xff', do this: # echo -en '\x17' | dd bs=1024 count=1 conv=sync >/dev/mtd4 dd: writing `standard output': Input/output error # hexdump -C /dev/mtd4 00000000 17 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| Can you tell why it worked ? - Werner _______________________________________________ support mailing list support@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/support
