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

[Wolfgang Denk]

Dear Timur Tabi,

In message <4BFEDE90.6070802 at freescale.com> you wrote:
> Wolfgang Denk wrote:
> > 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.
> 
> But we don't ever do that, at least not on systems that use SPD.  We query
> the DIMMs directly via SPD and calculate how much memory is in the system.
> 
> Most of our boards support both SPD and "fixed" DDR programming.  In fixed
> mode, the actual values to be programmed in the controller are hard-coded in
> the board header file, like this:

When you have SPD information you can of course use this for size
information. In the "fixed" case you get a max size from the #defines.

> But on the P1022DS, I don't support fixed DDR mode.  Only SPD is supported,
> so I have no idea at compile-time how much memory is in the system.  That's
> why I don't think calling get_ram_size() is appropriate for the P1022DS board.

You do not need to know this at compile time - it is sufficient to
know it when calling get_ram_size().

Best regards,

Wolfgang Denk

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