NAND write verify failed problem -->cramfs

[Charles Manning]

On Friday 06 June 2003 21:54, you wrote:
> Sorry I am new to this list and I have two questions as below:
>
> 1. To loop mount a CRAMFS (root file system) image on one JFFS2 partition,
> we should mount that partition first, shouldn't we? But how can we mount
> that JFFS2 partition without mounting the root file system?

Doing this with a root file system makes it a bit more challenging... I don't 
know if that can be done.
>
> 2. Currently I use NAND flash with ramdisk image on /dev/mtdblock1 as the
> root file system. Usually I write the ramdisk image using the command
> "nandwrite /dev/mtdblock1 ramdisk.gz". So far everything works fine. But I
> am wondering whether the kernel can still load the ramdisk image if there
> are some bad blocks on /dev/mtdblock1?

You could perhaps use a cut-down version of YAFFS (like is used in the YAFFS 
bootloader) to store a CRAMFS image. This is relatively simple and quite a 
few people do this for booting.

Do you have enough RAM to load the image into RAM at boot? That would make it 
even easier.

-- CHarles

>
> Thanks a lot for the help.
>
> Regards,
> Kevin
>
> ----- Original Message -----
> From: "Charles Manning" <manningc2 at actrix.gen.nz>
> To: "Pantelis Antoniou" <panto at intracom.gr>; <tglx at linutronix.de>
> Cc: <linux-mtd at lists.infradead.org>
> Sent: Friday, June 06, 2003 5:10 AM
> Subject: Re: NAND write verify failed problem -->cramfs
>
> > BTW, is there something anologous to CRAMFS for NAND flash?
> > I have a need for a compressed read-only filesystem on NAND
> > but CRAMFS has no concept of bad blocks.
>
> You could use loop mounting. ie. store the CRAMFS  image using a normal
> NAND file system (YAFFS or JFFS2) and loop mount it with cramfs.
>
> -- CHarles
>
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