Im trying to build a Development board for the AT91RM9200 and am using SDRAM in 16 bit mode , and 2 Mb Flash. I have managed to Store U-boot in the Dataflash and to get it to boot from it. The Atmel Utility picks up U-boot from the Flash and runs it from SDRAM.
The problem im having is that spontaneously while running , the System automatically Resets. This was not happening prior to running U-boot from the RAM chip .
I connected the reset line to a CRO and there was no dip in the RESEt line....What could the problem be? What other conditions (apart from the reset line going low) could cause the CPU to reset?
Further , i also noticed greater noise on the reset line signal , once the code was execuuted from SDRAM...is that acceptable ?(normal?)...
In the past , i have also faced this same CPU reset problem ...back then changing the cable from the debug port to the serial communication board solved the problem...If there is a hardware problem on this board , what could it be and how can i isolate it ?
Thanks a lot in anticipation....