In message 200310070832.h978WMcd000313@mail0.dreamwiz.com you wrote:
I'm trying to modify u-boot image for IBM Walnut ref. board to use in the other system(ppc405 core)
Please be careful. What you do requires a new port of U-Boot to your own hardware, not just a simple modification of the Walnut port.
but the system has only bootrom of size 128KB, while walnut has 512KB.
128 kB is not much. You will have to disable a LOT of features. Start disabling commands you don't need, like loads and loadb etc. Then disable other features not really needed - for example support for KGDB, BedBug, ELF Files, PCI, ...
the modification i have tried until now is as follows...
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- modified TEXT_BASE in board/walnut405/config.mk
This will not change the size at all...
the result size of u-boot.bin = 173KB or so ... need to be reduced more.
- disable DBGFLAGS = -g, in u-boot_root/config.mk
This will not change the size of the image, either.
what other methods can you suggest to minimize the size of u-boot without hanging in u-boot operation ??
Throw out features you don't need. See above.
Best regards,
Wolfgang Denk