[U-Boot] suggest on how to convey value of 'CCSRBAR' to user on FSL PPC parts

[Wolfgang Denk]

Dear Kumar Gala,

In message <7ACC3970-1B73-4828-941C-48C6601A7F80 at kernel.crashing.org> you wrote:
> I had two ideas on simple ways to convey the value of CCSRBAR, IMMR,  
> etc.. on various Freescale PPC SoCs.  Knowing the value is useful in  
> debugging if you need to dump the register space.  I wanted to see if  
> people had a preference or other ideas:
> 
> 1. add it as output when we boot:

This would be only acceptable when DEBUG is enabled, and even this
it's ugly.

> 2. add it as a environment variable
> 
> ccsrbar=fe000000

Please don't.

> I also thought about having it as a command but that seems like a lot  
> of code w/o any real purpose.

I don't understand what exactly you need it for.

The information should be part of struct bd_info for all relevant
architectures, and struct global_data holds a pointer to bd_info as
the first element, and on PowerPC R2 holds a pointer to the global
data.

So you can easily define a GDB macro to do something like this:

(gdb) print/x ((gd_t *)$r2)->bd->bi_immr_base

Best regards,

Wolfgang Denk

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