[U-Boot] Help!Some memory doesn't work on PPC405Ex based board!

[SunNeo]

Have performed a slow memory post using code in post/drivers/memory.c, still no error. I found memsize in post/driver/memory.c has a limit of 256MB, so I modify it to 1024M.

 

Have tried Linux-2.6.29, same result.


Best Regards,

Sun

 
> From: sr at denx.de
> To: sunwx2001 at hotmail.com
> Subject: Re: Help!Some memory doesn't work on PPC405Ex based board!
> Date: Thu, 23 Apr 2009 10:07:41 +0200
> CC: gerickson at nuovations.com; fkan at amcc.com; support at amcc.com; u-boot at lists.denx.de
> 
> Sun,
> 
> On Thursday 23 April 2009, Grant Erickson wrote:
> > On 4/22/09 10:00 PM, SunNeo wrote:
> > > I got a new board with 1GB DDRII memory and only 1 Rank, but the problem
> > > still exist.
> > >
> > > The following is a summary of my job:
> > >
> > > 4. Have performed memory test with "mtest" command at U-Boot, no error
> > > happened.
> >
> > Sun:
> >
> > It's been awhile since I looked at the code for mtest; however, it may not
> > be entirely comprehensive or exhaustive depending on how you configured
> > your u-boot build and the arguments you invoked it with. Do verify that it
> > is operating over the largest range of RAM possible and that it is doing an
> > array of tests (walking 1s, alternating bit patterns, etc.).
> 
> Take a look at the mem test included in the POST framework 
> (post/drivers/memory.c). This should be more extensive.
> 
> <snip>
> 
> > > 9. Add the parameter "mem=516M" to bootargs, Linux can boot up normally.
> > > But if add "mem=517M" to bootargs, Linux hangs.
> >
> > That should be instructive. Start tweaking mtest or writing your own memory
> > tests to tease out a pattern from that. Failing that, what other values
> > work here? What values fail?
> 
> And I'm wondering why you are using such an old Linux kernel version. I 
> suggest to at least test a recent arch/powerpc version. Perhaps this gives 
> other results.
> 
> Best regards,
> Stefan
> 
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