Bad Blocks on NAND and JFFS2
gleixner at autronix.de
Wed Mar 20 03:43:43 EST 2002
On Dienstag, 19. März 2002 10:40 , Thomas Locher wrote:
> I tried to put the JFFS2 on our NAND flash, but now I have troubles with
> bad blocks on the flash device.
> The actual CVS (cvs.infradead.org:/home/cvs) code seems to support bad
> block handling, but the code
> doesn't work correctly.
> What is the status of bad block handling in JFFS2?
> I ask you this because I think you have developped most of the bad block
Please keep such questions on the mailing list. Others may be interrested
Which chips do you use ? Which file did you use as template to hack your
chipdriver ? Have you adjusted
/* 20 us command delay time */
this->chip_delay = 20;
The bad block handling is fully functional. It uses the bad block marking
scheme of NAND chips (Samsung/Toshiba) and Smartmediacards, which is the same.
You must enable
Enable ECC correction algorithm' (CONFIG_MTD_NAND_ECC)
JFFS2 layout for OOB area (CONFIG_MTD_NAND_ECC_JFFS2)
There were some modifications to JFFS2 recently, so the CVS seems to be
broken for JFFS2 and NAND at the moment. I will check this anyway today. Keep
an eye on the maillist and on linux-mtd-cvs at lists.infradead.org (cvs announce
Thomas Gleixner <gleixner at autronix.de>
autronix automation http://www.autronix.de
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