[Buildroot] Problem with an MPC8272 build

From: Jason Rennie <jason.rennie@rftechnology.com.au>
To: buildroot@busybox.net
Subject: [Buildroot] Problem with an MPC8272 build
Date: Mon, 05 Aug 2013 10:03:10 +1000	[thread overview]
Message-ID: <51FEEBBE.9020206@rftechnology.com.au> (raw)
In-Reply-To: <CALo-6+hZ1-BzFd=uU-9gxazw+Z09R=rXPKY1Q0qC1x46ag8ucA@mail.gmail.com>

Thanks for the reply Charles.

I do know I need to use ttyCPM0/1 (made that mistake already). I agree, 
what is wrong with the old S0?

The kernel output I included was from the 2.6.18 build made long ago by 
someone who has long since moved on. I figured it would be worth 
including as a "last known good" configuration.

Jason

On 3/08/2013 4:18 AM, Charles Krinke wrote:
> Good point Gustavo. If I recall, if the dtb is wrong, one will not get
> as far in the kernel boot process.
>
> In looking at the output, it looks like it is all the way to running
> the init process. Usually when that happens in the systems I work
> with, it is a matter of not satisfying the init process properly. Most
> usually that is a mismatch of the name of the root console.
>
> For whatever reason, in recent years, all the folks making SOC designs
> have gone away from the old, original ttyS0 and every vendor seems to
> have a special name for their serial port, so I thought that would be
> the most fruitful place to look.
>
> Charles
>
> On 8/2/13, Gustavo Zacarias <gustavo@zacarias.com.ar> wrote:
>> On 08/01/2013 08:49 PM, Jason Rennie wrote:
>>> Buildroot does run successfully, and I have put the rootfs that is made
>>> on the device and it does boot successfully with the older kernel (well
>>> mostly, some networking stuff appears to be missing). But when I put the
>>> new kernel on the device I get nothing. I've tried enabling early kernel
>>> debugging but with no success (setting the CPM to the addresses
>>> suggested by the old kernels output). I also don't seem to be able to
>>> get U-Boot to work and I need to end up breaking out the BDI2000 anytime
>>> I try to update U-Boot with the newer version as I brick the device.
>>>
>>> I have tried with the most basic possible build, not tweaking anything
>>> and basically just doing the stock buildroot build for the MPC8272
>>> through to poking and tweaking all sorts of thing.
>>>
>>> Any tips? I've attached the old dmesg output if tht helps. I'm
>>> hopelessly confused and been beating my head against this for a month so
>>> any help would be greatly appreciated. I'm pretty much out of ideas.
>> A buildroot .config would help so we can see if there's anything that
>> could go wrong.
>> On the toolchain side a 603e should be the target, if that's wrong then
>> anything you build might fail.
>> On the kernel side are you building a 2.6.18ish kernel with a new
>> buildroot or a newer kernel? An updated kernel will very likely need an
>> updated DTB as well.
>> Regards.
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>