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

[Wolfgang Denk <wd@denx.de>]

Dear Timur Tabi,

In message <4BFEDE90.6070802@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

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"This is a test of the Emergency Broadcast System. If this had been an
actual emergency, do you really think we'd stick around to tell you?"