[U-Boot] [PATCH] ARM: tegra: Use mem size from MC rather than ODMDATA

[Stephen Warren]

On 07/02/2014 03:18 PM, Wolfgang Denk wrote:
> Dear Stephen Warren,
> 
> In message <1404331950-4916-1-git-send-email-swarren at wwwdotorg.org> you wrote:
>>
>> In at least Tegra124, the Tegra memory controller (MC) has a register
>> that controls the memory size. Read this to determine the memory size
>> rather than requiring this to be redundantly encoded into the ODMDATA.
>> This way, changes to the BCT (i.e. MC configuration) automatically
>> updated SW's view of the memory size, without requiring manual changes
>> to the ODMDATA.
> 
> Is there a specific reason for not using get_ram_size()?

Since we know the exact RAM size, we may as well simply use it directly
rather than "probing" for it.

I know that if non-existent peripheral addresses are accessed by the
CPU, the CPU or some bus hangs. I'm not sure if the same applies to
addresses within the memory window where there is not actually RAM
present on a particular board, but I'd rather not risk it by touching
them during probing.

BTW, I'm out on vacation starting tomorrow, so may not respond soon.