[coreboot] How to check if DRAM init is OK?

[Iru Cai]

Hi,

I'm now porting coreboot to CubieTruck, a development board with an
Allwinner A20 SoC. I use Mr.Nuke's code[1] and Allwinner's user manual for
reference.However, when I modified the code and tested with the board, the
console gave only two lines of message and it get stuck. So I thought DRAM
init failed. I put some printks at bootblock_media.c, and found the bug
occurs at line 118[2], which showed the access of a certain memory space
caused the error. So I need to know how to check if the DRAM init works.

Thanks
Iru Cai

[1] https://github.com/mrnuke/coreboot/tree/cubie_mmc
[2]
https://github.com/mrnuke/coreboot/blob/cubie_mmc/src/cpu/allwinner/a10/bootblock_media.c#L118
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