[U-Boot] [PATCH] [RFC] memsize.c: adapt get_ram_size() for address spaces >32 bit

[Kumar Gala]

On May 27, 2010, at 3:57 PM, Wolfgang Denk wrote:

> Dear Timur Tabi,
> 
> In message <4BFECF82.60901 at freescale.com> you wrote:
>> 
>> Scott pointed out that writing/reading memory to determine how much memory
>> actually exists is dangerous.  I'm not convinced that I should be using
>> get_ram_size().  I still believe that I shouldn't.
> 
> And I point out that we have been doing this for a decade on tens of
> different board configurations with millions of devices in the field.
> 
>> I have not been able to find any other PowerPC system in U-boot that
>> supports more memory than is mapped.  If you know of one, please tell me.
> 
> The systems I know are the opposite - initially they map more memory
> than they support, then they determine the real size, then they
> adjust the mapping to the real size.

Is the point of get_ram_size() to deal with having the same firmware image (binary) be able to be agnostic of memory size?

I'm not sure I understand what utility one gets out of it if we have SPD eeprom information?  I can see some purpose in the soldered memory case if you dont want to tweak binaries between different memory size configs.

- k