[U-Boot-Users] [PATCH] fix compilation problem for mpc8349itx CFG_RAMBOOT

Nikita V. Youshchenko yoush at debian.org
Wed May 23 22:13:43 CEST 2007

> > Please take a look at my MPC8349ITX.h to see the full extent of what I
> > was trying to do.
> Yes, I know what it does. Frankly, it's ugly.

I think that the original reason of such 'ugly' solutions is the usage of 
singe macro (CONFIG_COMMANDS) with bit-fields. This is causing problems, 
- it is nos scalable to manually define CONFIG_COMMANDS as a bitwise-or of 
all needed CFG_CMD_* in each file under include/configs - because adding 
new 'arch-independent' command in this case will require mo9dification of 
all those files;
- so things as CONFIG_CMD_DFL become needed;
- but C preprocessor is has poor redefining capabilities - we can't just 
redefine a macro using it's previous definition - so usage of 
CONFIG_CMD_DFL causes issues like one being discussed.

A much better solution could be to have a macro-per-command.
In this case:
- command xxx could be compiled in, if CONFIG_CMD_XXX is defined, and not 
compiled in if not defined;
- it could be easy to define/undefine such macros in config

But I don't think that such a change could be possible at the current stage 
of u-boot development.

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