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

[Kumar Gala]

On Aug 4, 2009, at 9:24 AM, Wolfgang Denk wrote:

> 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

I didn't think about it being in the bd.  I can use 'bdinfo' to output  
its value.

- k