I'm trying to modify u-boot image for IBM Walnut ref. board
to use in the other system(ppc405 core)
but the system has only bootrom of size 128KB, while walnut
has 512KB.
the modification i have tried until now is as follows...
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- modified TEXT_BASE in board/walnut405/config.mk
u-boot.bin is configured as
0000'0000 ~ 0002'B68B : u-boot source data
0002'B68C ~ 0007'FFFB : empty space (filled with FF)
0007'FFFC ~ 0007'FFFF : reset vector
walnut Flash memory map : FFF8'0000 ~ FFFF'FFFF (512KB)
porting system bootrom memory map : FFFE'0000 ~ FFFF'FFFF(128KB)
the size of empty space = max 0x0005'4971 possible to reduce, so
change in board/walnut405/config.mk,
TEXT_BASE = 0xFFF8'0000 + 0x0005'4971 = 0xFFFD'4971
the result size of u-boot.bin = 173KB or so ... need to be reduced more.
- disable DBGFLAGS = -g, in u-boot_root/config.mk
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what other methods can you suggest to minimize the size of u-boot
without hanging in u-boot operation ??
Waiting for your response... thank you.
- hwjang.