mtd partition1 corruption during writes to JFFS2 on partition2.

Vipin Malik vipin at
Mon Feb 3 09:13:25 EST 2003

Hi Jocke,

Thanks for the reply.

>I also have several partions(ppcboot, kernel and JFFS2) and I never had any
>problems to update ppcboot or kernel(cp file /dev/mtdblock0) while JFFS2 
>is mounted.
>I am using cmdset0001 driver, so perhaps it's a driver problem?

I'll take a look. Anyone care to tell me where the locking to prevent 
multiple processes from accessing the flash at the same time takes place? 
(is this a chip driver feature or an mtd feature? There are some spin locks 
in the cfo_cmdset0002.c driver but AFAIK spin locks are really NOPS on 1P 

>If you will play with the cmdset0002 driver, consider to add point/unpoint
>support(already in cmdset0001).

What's that? XIP? I'll look into it if I start to hack the driver.

>Recently(a few weeks ago) a locking bug in JFFS2 was fixed which bit me during
>boot, don't think this what's biting you though.

I'm running 2.4.20 Is the fix in there?


>  Jocke
> > I've got multiple mtd partitions on one NOR flash device (CFI/AMD).
> >
> > I've got JFFS2 fs mounted on the last partition. The other partitions hold
> > compressed firmware, that I intent upgrade while JFFS2 is being written to.
> >
> > However, I find that if I write to the mtd device(s) (erase, followed by
> > dd) and then reboot, the firmware is corrupt.
> > If I stop writes to the JFFS2 partition before upgrading the firmware on
> > the mtd partitions, everything is ok every time.
> >
> > Is this a known "feature"?
> > Ideas?
> >
> > TIA
> >
> > Vipin
> >
> >
> > ______________________________________________________
> > Linux MTD discussion mailing list
> >

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