Hello,
First of all sorry if this question was already answered here.
We are sourcing some K9F8G08U0M-PIB0 NAND flash devices. On the first erase in uboot 2011.09 I got bunch of mostly consecutive bad blocks. According to the datasheet we should get not more then 80 bad blocks for our chip but I get something like 240 bad blocks for most of the NAND chips.
I seems to be able to fix this using the following procedure:
In uboot uboot>nand scrub.chip
In uboot uboot>nand erase.chip clean at this point I get usually 1,2 bad blocks which looks normal to me.
In Linux we have few mtd partitions on this NAND chip. Unmount all of them and for all of them : linux>nandtest -m /dev/mtdx Usually this doesn't add any new badblocks on top of what I get on nand erase in uboot, but I really haven't tested that much device to say.
After this procedure the NAND flash seems to work fine. Do you think this is reliable way? Is there something better I can do?
Has anyone got NAND component batch having more bad blocks then datasheet allows. Should we consider the provider unreliable?
Thank you Dimitar