In message 7EA18FDD2DC2154AA3BD6D2F22A62A0E19D733@zch01exm23.fsl.freescale.net you wrote:
I still do not think a RAM version u-boot is just "waste of time". It depends.
YMMV...
If we only want to improve some part of the u-boot, such as "PCI", a RAM version might be useful. It is more convenience and cheaper.
No. Modifying the code, loading the image to RAM, booting it there, finally undoing all the modifications, storing the final image in flash, re-test everything is more effort and takes longer than just using the original code right from the beginning. Of course this assumes you have either ethernet on your board or a fast JTAG prgrammer so the image download / flashing is a matter of just a few seconds (remember that this can be a singlke command in U-Boot, like "run load update" :-)
He can backup his flash image to a file with CodeWarrior + PowerTAP(BDI2000) before programming his new flash image.
If he can do this, there is zero need for a RAM image.
Best regards,
Wolfgang Denk