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