[U-Boot] [PATCH V2 3/3] Add support for the LaCie ED Mini V2 board

Wolfgang Denk wd at denx.de
Mon Dec 7 22:56:32 CET 2009


Dear Albert ARIBAUD,

In message <4B1A05A9.4040104 at free.fr> you wrote:
>
> > No, this is not correct. get_ram_size() is used always on a single
> > bank of memory only.
> 
> Do you mean calling get_ram_size() four up to times based on the 
> configured number of banks and configured sizes? I then fail to see the 

Yes, exactly.

> added value of get_ram_size() wrt using the configured sizes directly.

The added value is that get_ram_size() will detect (1) a lot of common
error situations and (2) will detect the actual size of the respective
memory banks.

Assume you have a system where differentt types of memory chips can be
fit, or where you can insert memory modules. Then you configure for
the largest possible type, and get_ram_size() will detect what's
really present, so you can adjust the configuration. See the README
for details.

> >> However I realize that this code is actually SoC-specific, not 
> >> board-specific. It could be moved in cpu/arm926ejs/orion5x/dram.c, and 
> >> then orion5x_sdram_{bar,bs} could be made static (or inlined).
> >>
> >> What do you think?
> > 
> > Seems to make sense.
> 
> All right. Does doing that lift the requirement to use get_ram_size()?

I see no reason yet why you would not want to use get_ram_size() - the
memory test feature alone is useful enough, even if you never intend
to use different RAM sizes.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
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