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RE: flash file system lock up

> I experience some flash lock up problem, it appears that
> the whole flash memory being lock up, not be able to write
> or delete, even after power off and restart it, but it can read,
> so I still can login to the system.  
> In these case, only re-burning the whole system can let me 
> access the flash, any hint to why it happens?  Thanks.

Try turning on JFFS-debug in the kernel ("make xconfig" or "make menuconfig") and watch 
for output on the debug port when the system hangs.

Are you using devboard_lx-R2_0_0? Have you upgraded the kernel or changed the original
software in any other way (than could make a difference)?