Werner Almesberger schrieb:
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
i can't. it is possible that i flashed my boot with dfu-util and the
rootfs directly.
for the other partitions i cant tell. maybe because the contents didn't
change i did'nt see any error.
just for clearness: is the boot - partition different from the rootfs ?
and how are the other partitions ?
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