[U-Boot-Users] [PATCH] SPI relocation fix

[Vladimir Gurevich]

Hello Wolfgang,

Wolfgang Denk wrote:

>Please don't call empty functions if you can avoid it. It adds to the
>code size, and makes understanding the code much harder.
>  
>
No problem. I can easily #ifdef the call to UcodeCopy rather than the 
body itself, since it's predicated on the need for the patch. But 
cpm_load_patch() should still has to be called unconditionally and if no 
relocation is required at all, it will be empty. This is a small price 
to pay for the ability to handle different cases automatically without 
the need to worry about whether a microcode patch is actually needed 
(because depending on the CPU and actual settings there might be no 
relocation or relocation with or without a patch).

I believe that we need some centralized code, because certain 
combination of patches/devices do affect other devices (that's the 
nature of microcode patches provided my Motorola) that might not really 
be used by a certain board, but still have to be programmed correctly. 
For example, the combined I2C/SPI/SMC relocation patch requires correct 
rpbase settings on both SMC1 and SMC2 regardless of whether you plan to 
use them or not.

Unfortunately, all these dependancies are a little difficult to express 
via C preprocessor (at least not without making the configuration much 
more complex and error prone). You can see that  the code in 
mpc8xx_upatch.h got pretty complex on its own.

Regards,
Vladimir