[U-Boot-Users] U-boot for pxa255

Hi, We have a custom built PXA255 board with 32 MB SDRAM, 32MB Flash( one 28F256L30b 16MX16 bit wide) and FFUART for serial port. I am unable to boot U-boot after loading to flash through JflashMM program. Flash loading is verified successfully. 1. How do I debug? 2. Does u-boot support the above flash configuration? 3. Are there any patches to u-boot to make it work for the above configuration? Appreciate your response Regards, swamy