[U-Boot-Users] [PATCH] IceCube fixed and cleaned up SDRAM init

[Mark Jonas]

Hello,

the attached patch fixes a problem with the SDRAM init code  for IceCube 
(Lite5xxx) I experienced when using LOWBOOT images. In my case U-Boot 
would always die when doing the first access to SDRAM after 
initialization which is usually done when trying to find out how big the 
SDRAM is.

I found that no sync instructions where used the synchronize the program 
flow during SDRAM initialization. This is fixed now. Additionally, I 
cleaned up the code and moved all the SDRAM chip specific constants into 
separate include files. The SDRAM initilization itself should be better 
readable now, too, by merging the DDR / SDR and the MGT5100 / MPC5200 
code as cleanly as possible.

The code was tested on a Lite5200 (16 MB Flash, LOWBOOT), a Lite5200DDR 
(16 MB Flash, LOWBOOT) and a Lite5100 (8MB Flash).

Regards
Mark Jonas
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