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

[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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[U-Boot-Users] IceCube 10/100 Mbit Ethernet

[Peter Graf]

Hi,

has anybody an idea why the MPC5200 ethernet device is forced into 10 
Mbit operation? The comment in include/configs/icecube.h just says: 
"Workaround for FEC 100 Mbit problem". I wonder what the problem is.

Thanks for any hints,
Peter

[U-Boot-Users] IceCube 10/100 Mbit Ethernet

[Wolfgang Denk]

In message <407BE635.40105@itknet.de> you wrote:
> 
> has anybody an idea why the MPC5200 ethernet device is forced into 10 
> Mbit operation? The comment in include/configs/icecube.h just says: 
> "Workaround for FEC 100 Mbit problem". I wonder what the problem is.

Please check out a more recent version of U-Boot (i. e. 1.1.0)

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
"Success covers a multitude of blunders."       - George Bernard Shaw

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

[Wolfgang Denk]

Dear Mark,

in message <407BBAFC.8080402@motorola.com> you wrote:
> 
> * Patch by Mark Jonas, 13 Apr 2004:
>   - Add sync instructions to IceCube SDRAM init code
>   - Move SDRAM chip constants into seperate include files
>   - Unify DDR and SDR initialization code

Thanks - added.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
...computer hardware progress is so fast. No other  technology  since
civilization  began  has seen six orders of magnitude in performance-
price gain in 30 years.                             - Fred Brooks, Jr.