In message 001301c464fd$04995e40$3136a8c0@sassenage.massy.thalesees.com you wrote:
could you please list the minimal Hardware resources required by U-boot. I
CPU and RAM.
This is all you need to have a running system. Not that it would be of any use, of course.
mean what are the mandatory peripherals that we should integrate (for example: Interruption controller, uart.....)
( I am working with a Virtex II Pro FPGA integrating a PowerPC processor)
I think you put the cart before the horse. It's not the boot loader that determines which peripherals are needed, but your application. U-Boot is flexible enough to do with what's available.
Of course, an UART for a serial console port is pretty useful, as is an Ethernet interface because it greatly accelerates the development cycle. Or some flash memory to save your images and envrionment variables, etc.
Bot none of this is strictly necessary.
Best regards,
Wolfgang Denk