Help!Some memory doesn't work on PPC405Ex based board!

[SunNeo]

Hi, Stefan,

 

Thanks for your help.

 

My platform uses the MICRON MT47H256M8THN DDRII SDRAM and the DDRII SDRAM is soldered on the board.


As I said, my board was similar with "Kilauea" evb, so I created my configuration header file from Kilauea's at U-Boot. In the configuration file, register value for the DDR SDRAM controller is defined. But I have removed DDR autocalibraton related configuration from the configuration file, do you think this will cause any issues?

 

I'm not sure what you mean about "intensive memory test". I use "mm" cmd under U-Boot command prompt to modify value of high 512M memory, and this command works well.

 

About booting Linux, the kernel hangs at the same location. Always after this print info "<4>Mount-cache hash table entries: 512".


Best Regards,

Sun

 
> From: sr at denx.de
> To: linuxppc-dev at ozlabs.org
> Subject: Re: Help!Some memory doesn't work on PPC405Ex based board!
> Date: Tue, 14 Apr 2009 11:23:02 +0200
> CC: sunwx2001 at hotmail.com
> 
> On Monday 13 April 2009, SunNeo wrote:
> > I'm porting Linux-2.6.29 on PPC405Ex based board, it's very similar to AMCC
> > "Kilauea" evb.
> >
> > In my board, two 512MB DDRII memory is connected to 2 ranks of the 405Ex
> > CPU. This 1GB memory works well at U-Boot-2009.01, but when I boot
> > Linux-2.6.29, the kernel hangs somewhere.
> 
> Does it just hang "somewhere", or always at the same location? A random hangup 
> could mean that you are having a memory problem (hardware, or wrong 
> initialization).
> 
> > What interesting is, if I 
> > configured the system to use only 512MB memory at U-Boot, the Linux can
> > boot normally.
> 
> Are you using DIMM's on your platform? Or soldered chips? Which memory 
> initialization code are you using in U-Boot? And which autocalibration code?
> 
> Did you do some intensive memory test?
> 
> Best regards,
> Stefan

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