[U-Boot] [PATCH] add explicit bbt creation to commandline

Steven Zedeck
2010-02-12T17:38:14Z

>
> Hi,
> I know this message is about 18 months old. I am using Uboot 2008.10,
> which
> seems to not include support for creating the Nand BBT (bad block table).
> Was this patch released and if so when? Forgive me as I don't know how to
> find out.
>
> How best to add BBT support to Uboot? I need to have a BBT created such
> that
> Linux can use it when it loads.

> U-Boot supports creating a bad block table in flash, and has done so since
> before 2008.10 (assuming you're not using legacy NAND). Whether it does
> this depends on whether the NAND driver requests it with NAND_BBT_CREATE
> in
> nand_bbt_descr.options and NAND_USE_FLASH_BBT in nand_chip.options.

I REALLY appreciate your help. I see in drivers/mtd/nand/nand_bbt.c where it
checks for NAND_BBT_CREATE. What I don't see is where/how this gets set. Is
there a config file that sets this?

thanks,
Steve

> Linux can also create this table. Either way, it only needs to be done
> once, not on every boot.

> What the patch you quote does, as far as I can tell without what's been
> snipped, is allow a new bad block table to be created when erasing the
> entire chip. Normally the bad block table would be excluded from a
> full-chip erase.

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