Bad blocks in NAND

[Andy Green]

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Somebody in the thread at some point said:
| As I said some days ago in a discussion about flashing via dfu-util or
| doing it after having booted from SD, I did it several times now during
| the last 2 days, and it works great. Another advantage is, after
| flashing the rootfs, you can adjust settings on the newly flashed fs
| (copy dropbear host keys, ssh authorized_keys, wpa_supplicant.conf and
| such) before booting the new system.
|
| However, I get this messages when erasing the rootfs:
|
| debian-gta02:/media/mmcblk0p6/Om2008.9# flash_eraseall /dev/mtd6
| Erasing 128 Kibyte @ f600000 -- 99 % complete.
| Skipping bad block at 0x0f620000
| Skipping bad block at 0x0f640000
| Skipping bad block at 0x0f660000
| Skipping bad block at 0x0f680000
| debian-gta02:/media/mmcblk0p6/Om2008.9#
|
| Is it really always 128 kB that are marked as bad block? Anybody else
| got bad blocks already? It looks like dfu-util isn't reporting these
| errors from flash erase.

There's a bad block table floating around at the end of the flash, it is
falsely marked as being itself in bad blocks so it is left alone.  I
guess this is that.

- -Andy
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