[U-Boot-Users] post memory test

[Jens Gehrlein]

Detlev Zundel wrote:
> Hi Dongy,
> 
>> I have a question about post memory test. According to the following code, even
>> if memory size is greater than 256M, only 256M memory will be tested.  Is it
>> true or I missed something.  Thanks a lot.
> 
> No, this is true.  As I did not write that code, my interpretation
> uses some speculation, but what is very likely the case here is that
> U-Boot potentially does not map all physical available memory and thus
> we cannot even access it.  As we do not have explicit variables
> representing those facts, I guess the 256MB are kind of a least
> common denominator.
> 
> As an example look at initdram() in board/Marvell/db64460/sdram_init.c
> where the platform uses Block Address Translations (BATs) to map RAM
> but exhausts these pretty scarce ressources and limits itself to
> mapping only the first 256MB (a usual limit for a BAT).

So it is possible to overlay the function memory_post_test() by a
board specific routine, which may cover almost all RAM?

BTW, is it possible to overlay _all_ POST routines by board specific
routines?

Kind regards
    Jens