In message 877aabc404081704266d856f38@mail.gmail.com you wrote:
This is no problem at all. There are even boards without any flash at all (for example, the PN62 board has no flash, and the U-Boot image gets loaded into RAM over PCI).
Hey WD, can you explain a bit on how you actually did this? The preboot command copies something from PCI. How / when do you write to the SDRAM over PCI? Did you do this through interrupts? Or was it something else?
In our case this was different. The system is a standard PCI card which sits in a PC. Some software on the PC will initialize the card, holding the processor in reset. It will then upload the U-Boot image into SDRAM, and then release the processor on the card which will boot U-Boot from the location in RAM, which then in turn will load and boot Linux.
Best regards,
Wolfgang Denk