[U-Boot-Users] [PATCH] IceCube fixed and cleaned up SDRAM init
Mark Jonas
mark.jonas at motorola.com
Tue Apr 13 12:03:40 CEST 2004
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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