From: Mark Jonas <mark.jonas@motorola.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] [PATCH] IceCube fixed and cleaned up SDRAM init
Date: Tue, 13 Apr 2004 12:03:40 +0200 [thread overview]
Message-ID: <407BBAFC.8080402@motorola.com> (raw)
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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next reply other threads:[~2004-04-13 10:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-13 10:03 Mark Jonas [this message]
2004-04-13 13:08 ` [U-Boot-Users] IceCube 10/100 Mbit Ethernet Peter Graf
2004-04-13 13:39 ` Wolfgang Denk
2004-04-18 23:21 ` [U-Boot-Users] [PATCH] IceCube fixed and cleaned up SDRAM init Wolfgang Denk
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