[U-Boot-Users] lowlevel init and reboot issue SOLVED

[Roman Kolesnikov]

Hello I have solved my problem, and I am passing some experience to the 
group.

I have had trouble resetting the system through the Watchdog timer. My 
system was at91rm9200EK type board. The problem was caused by linux 
leaving the flash memory in an "unknown" and not ready state. Once the 
watchdog reset would occur, the system would not recover and hang. 
Because my parallel flash chip was different from the DK board flash 
chip, linux MTD support would cause the flash to go and not quit some 
operation. Also DK boards came with an outside reset pin, and the EK 
boards come with an outside pushbutton reset; watchdog would not be able 
to reset all the hardware on the ek board, it would only reset the 
processor (I think).

My solution was to disable the MTD Flash driver. Since I did not use the 
parallel flash from Linux, it was ok for me to do so. I have not made a 
new flash driver for linux. This change solved the problem.

Flash that DK and EK boards use are mature and will likely be replaced 
by new product. I noticed that newer Atmel flash comes with two to three 
cycle commands, instead of upto 5 cycle commands. We used newer flash, 
and that is why the Linux MTD support was working improperly.

Thanks for looking,
Roman