Hi Marco,

Marco Antônio Possamai wrote:

Thank you for your quick reply!

Sorry for the missing information. The .dts I'm using is the lite5200b.dts that comes along with the linux-2.6-denx kernel (got it at git://git.denx.de/linux-2.6-denx.git). What other .dts should I try? I'm using the mpc5200b board so it seems fitting that I'm working with lite5200b.dts.

There's a lite5200.dts source tree that also comes along with the kernel. I've tried with it and got the same results.

1) Please don't top post.

2) Please CC: the u-boot list. By replying directly to me, you excluded all the people with real knowledge.

The .dts has to match to board: it is the description of the hardware. If I understand your message, your board *is* the standard mpc5200b board (note that I have no idea what a mpc5200b board is, see point #2), in which case the standard .dts should work.

What debug capability do you have? Can you dump the linux log buffer (from memory) after a failed boot? http://www.denx.de/wiki/view/DULG/LinuxPostMortemAnalysis

I'm out of easy answers.

Good luck, gvb

----- Original Message -----
From: "Jerry Van Baren"
To: "Marco Antônio Possamai"
Cc: "U-Boot"
Subject: Re: [U-Boot] Linux hangs when uncompressing kernel image:
linux-2.6.26
Date: Thu, 16 Apr 2009 23:37:45 -0400


Marco Antônio Possamai wrote:
 > Hello
 >
 > I've been working on building a 2.6.26 linux kernel to the
mpc5200Lite
 > PowerPc board. However, I am unable to boot the system using the
 > generated image.
 >
 > I am using what seems to be the latest U-Boot for the job. Got it
from
 > www.denx.de/git/u-boot.git.

Good. :-)

 > I'm using the device tree compiler dtc-v1.2.0 to compile the
device tree
 > source into a device tree blob. Got it at:
 > http://jdl.com/software/dtc-latest.tgz

Good, but *what* did you compile?

If this were /., I would insert an automobile analogy about you
telling us all about the wrenches you used, how they were the best
Binford-2000 lifetime guaranteed wrenches with more power, but
never told us what part you were adjusting with the wrenches.


 > For the device, my design procedure is the following:
 >
 > 1. In the first step I generate the uImage file ('make ARCH=powerpc
 > zImage'), the corresponding lite5200b.dts and compile it to
 > lite5200b.dtb.
 > 2. Afterwards, I do the U-Boot configs. I define 0x00600000 as
the device
 > tree address and 0x00200000 as the uImage's.
 > 3. Finally, I transfer them all (using tftp for each, of course)
and try
 > to boot: 'bootm 0x00200000 - 0x00600000'
 >
 > The result is that the console hangs...

Is linux hung or is there no serial output? From the outside, the
two symptoms are indistinguishable. If linux is actually running,
it means your console/serial configuration in your dtb is not
right. Use your debugger to halt the processor and see what/where
it is executing. Dump the linux log buffer and see if there is
anything interesting in there that wanted to go out the serial
channel but couldn't.

 > Does anyone have any idea of why it happens? I checked a similar
problem
 > at the
 >
http://www.denx.de/wiki/view/DULG/LinuxHangsAfterUncompressingKernel,
and
 > I'm almost convinced that it is probably a bd_info problem,
concerning
 > the definitions of the kernel's IMAP_ADDR and the CFG_IMMR of
U-Boot to
 > be unmatching.

The flattened device tree replaces the bd_info structure as the way
to communicate configuration info from u-boot to linux.

 > If that is the case, how/where can I correct it? Which files should I
 > look for?

What are you using for your device tree source (.dts)? Odds are
pretty good that is the problem. If that is OK, second best is if
your console simply isn't configured properly. If neither of those
are the case, you have some serious debugging ahead.

 > Thanks for the attention.
 >
 > Marco Antônio Possamai
 >
 > Universidade Federal de Santa Catarina

Good luck,
gvb

Marco Antônio Possamai

Universidade Federal de Santa Catarina

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