In message 200701031949.26084.javierruere@apexar.com you wrote:
For what I gather from the instructions from Atmel, there is always a bootloader before U-Boot, loading it from the dataflash, serial port or Flash
No, this is NOT correct. If you have NOR flash on your board (which we consider a standard configuration) then U-Boot can boot directly, without a primary bootstrap loader. This is the mode of operation you want to have if your task is to get new hardware running.
Would it work to put an uncompressed image of U-Boot at the beginning of the flash memory and let it initialize the board if I don't add the define I mentioned before?
If "flash memory" means NOR flash, then yes, this will work fine. Actually this is the recommended (by me) mode of operation.
Best regards,
Wolfgang Denk