[U-Boot-Users] Freescale MPC8349EMDS hang on boot

[Ira Snyder <iws@ovro.caltech.edu>]

On Fri, Jul 18, 2008 at 02:17:48PM -0400, Jerry Van Baren wrote:
> > I checked include/configs/MPC8349EMDS.h and didn't find any obvious
> > config options for disabling the cache.
> > 
> > The hang happens before the relocation to RAM. The "I2C:" line where it
> > hangs is printed before the relocation. There are "SPI:" and "DRAM:"
> > lines that should also be printed before the relocation to RAM.
> 
> I2C is used to read the SPD configuration off the memory DIMM. 
> Interesting, but I'm not sure what it is telling us...
> 

Yep. Note that there is an access to the BCSR registers that I added.
Removing the access makes the problem go away, even with the .data
section 32 byte aligned. There shouldn't be any problem reading the
BCSR registers, though.

What I'm getting at is maybe it is neither of these that is the real
problem, it could just be that the BCSR access plus the alignment of the
.data section triggers the real problem, whatever it may be.

> > 
> > As some added information, I tried building with ELDK-4.1 (rather than
> > ELDK-4.2, which I have been using) and was unable to get the lockup.
> > However, in the past I did get several similar lockups using ELDK-4.1,
> > which went away when I upgraded to ELDK-4.2 (the problems prompted the
> > upgrade). Unfortunately, I just thought the problem was my code at the
> > time, and so I did not keep any images around.
> > 
> > Thanks for your help,
> > Ira
> 
> Weird behavior that changes with different builds and/or shifting things 
> in memory quite often are build tools or memory problems.  It doesn't 
> sound like you are having memory problems, but your build tools sound 
> suspicious.  There are lots of people running ELDK4.1 and 4.2 (myself 
> included - on debian, cross compiling for a MPC8360) so that probably 
> isn't the problem.
> 
> What is your build host running (OS, distribution)?  Any chance of doing 
> a clean OS and ELDK installation on a different machine?
> 

I'm running Ubuntu Hardy. My test machine here has a completely clean,
not updated installation of Hardy on it as well, I could try installing
and building with that. I also have access to a CentOS 4 machine that I
could install ELDK-4.2 onto. It has ELDK-4.1 already installed. I'll try
ELDK-4.2 on the CentOS machine as soon as the install media is finished
downloading, which will take a while. It might be Monday before I have a
chance to get back to you with the results.

> Running low on theories,
> gvb

Yep, it's got me completely stumped as well. I tried running "objdump -d"
on a broken and working u-boot ELF file (not the bin file, I don't know how
to dissassemble that) and the only changes it showed was the compilation
timestamp at the beginning of the file.

Thanks again,
Ira