reboot problem with jffs2

reboot problem with jffs2

[Jianlin Zeng]

Hi,

I have a MPC8248 based board running linux 2.6.11. I
mounted jffs2 FS on a NOR flash partition. The jffs2
FS works fine. But if I modify any files in the jffs2
FS and then soft reboot the board, the reboot hangs.
If I don't modify any files in jffs2 FS and just do
flashcp to a MTD char device, the soft reboot works
fine.

I tried implementing the "reboot" functionality on my
board either through "m8260_gorom" or a mechanism
similar to what is used on u-boot, the result is the
same. Can anyone let me know what difference between
jffs2 write and MTD char device write that could
possibly cause the reboot hang? Does anybody have
similar experience?

Thanks,
Jianlin


 
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Re: reboot problem with jffs2

[David Woodhouse]

On Fri, 2006-12-08 at 16:24 -0800, Jianlin Zeng wrote:
> I have a MPC8248 based board running linux 2.6.11. I
> mounted jffs2 FS on a NOR flash partition. The jffs2
> FS works fine. But if I modify any files in the jffs2
> FS and then soft reboot the board, the reboot hangs.
> If I don't modify any files in jffs2 FS and just do
> flashcp to a MTD char device, the soft reboot works
> fine. 

Check you hardware. I suspect the flash chip isn't being properly reset
when the CPU restarts.

-- 
dwmw2

Re: reboot problem with jffs2

[Jianlin Zeng]

Hi Dave,

Thanks for your information! It appears that I need to
set all flash sectors to read mode before reboot,
otherwise the CPU won't be able to read any boot code
from the flash after reboot. Don't know the reason
behind it but once I did that the reboot works fine.

Regards,
Jianlin


--- David Woodhouse <dwmw2@infradead.org> wrote:

> On Fri, 2006-12-08 at 16:24 -0800, Jianlin Zeng
> wrote:
> > I have a MPC8248 based board running linux 2.6.11.
> I
> > mounted jffs2 FS on a NOR flash partition. The
> jffs2
> > FS works fine. But if I modify any files in the
> jffs2
> > FS and then soft reboot the board, the reboot
> hangs.
> > If I don't modify any files in jffs2 FS and just
> do
> > flashcp to a MTD char device, the soft reboot
> works
> > fine. 
> 
> Check you hardware. I suspect the flash chip isn't
> being properly reset
> when the CPU restarts.
> 
> -- 
> dwmw2
> 
> 



 
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Re: reboot problem with jffs2

[David Woodhouse]

On Mon, 2006-12-11 at 10:52 -0800, Jianlin Zeng wrote:
> Thanks for your information! It appears that I need to
> set all flash sectors to read mode before reboot,
> otherwise the CPU won't be able to read any boot code
> from the flash after reboot. Don't know the reason
> behind it but once I did that the reboot works fine.

I told you the reason behind it. Your hardware is broken -- make sure
the reset line to the flash gets hooked up so it's waggled when the CPU
restarts.

-- 
dwmw2