[U-Boot-Users] [Q]How to reduce the size of u-boot image ? ? ?

[Wolfgang Denk]

In message <200310070832.h978WMcd000313 at 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...
> 
> =========================================================
>  - 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

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
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