Wolfgang,
Thank you for the response. My target will have 256M of RAM and I can locate das u-boot anywhere in this range so that it is not overwritten during the Linux boot process.
Would the top of RAM be a better choice then? If das u-boot is not viable after Linux is started that is fine, the system will re-download das u-boot when required.
Thanks Kevin
Wolfgang Denk wrote:
In message 40082CE1.40905@catapult.com you wrote:
I have been porting das u-boot to run directly out of RAM. So far so good, boots, serial works, ethernet works..
Running U-Boot out of RAM requires some understanding of the underlying principles.
The board is an 8275 with 32MB of RAM. das u-boot is downloaded with a BDI to 0.
This will never work. You cannot boot Linux that way, as the Linux kernel will overwrite U-Boot when you try to boot it.
Best regards,
Wolfgang Denk