securely wipe sensitive data from mtd?

[coreassumption <coreassumption@xxxxxxxxxxxxxx>]

What is the proper way to clean a mtd of any sensitive data that may be located on them (NOR and NAND)?

Would flashing a new image via uBoot be enough?  Or would the wear leveling mechanism prevent this from clearing everything?

Would writing 0's from a running OS's be sufficient?  Or is the device 'smart' and not write zero streams?

Are multiple passes of writing suggested or is this just a holdover from myths of magnetic mediums?

Thanks for any insights.

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/