U-boot _has_ to be stored at the address specified in TEXT_BASE. If you set TEXT_BASE to RAM and then try to run it from flash, it will not work.
_Maybe_ you can set TEXT_BASE to shadow flash ( xBEC00000 ) and launch it from YAMON. I have not tried this. Be sure to locate the correct entry point if you want to try this.
/Thomas
Ed Okerson wrote:
Thanks to some help from Thomas Lange, I think I am about ready to load u-boot on my DbAu1500 (Zinfandel) board. The problem I have now is, how exactly does one do that? The board currently has Yamon in the boot flash at 0xbfc00000, and has secondary flash at 0xbec00000. The s-records in u-boot.srec indicate that it wants to load at 0xbfc00000, but that causes yamon to overwrite itself and crashes. I have tried changing TEXT_BASE to 0xbec00000, and the s-records then look correct but it still doesn't load. I then tried changing TEXT_BASE to 0xa0100000 to get the s-records to load to ram, which appeared to work, I then erased the secondary flash and copied the ram to flash with:
YAMON> erase bec00000 100000 YAMON> copy a0100000 bec00000 100000
Then flipped the swap flash switch and hit reset, and the system did not boot. Can anyone enlighten me on how to do this?
Thanks Ed Okerson
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