[yocto] BBB doesn't boot

[Denys Dmytriyenko]

On Tue, Apr 15, 2014 at 05:44:04AM +0100, Richard Purdie wrote:
> On Mon, 2014-04-14 at 21:38 -0400, Denys Dmytriyenko wrote:
> > On Tue, Apr 15, 2014 at 01:20:03AM +0100, Richard Purdie wrote:
> > > On Mon, 2014-04-14 at 18:44 -0400, Denys Dmytriyenko wrote:
> > > > On Mon, Apr 14, 2014 at 02:11:05PM -0600, Gary Thomas wrote:
> > > > > Very interesting results!  These are the results from the build hosts I have:
> > > > >   Fedora 13 (i686) - fails
> > > > >   Fedora 17 (i686) - fails
> > > > >   Ubuntu 12.04 (x86_64) - boots
> > > > 
> > > > Interesting indeed. I have no idea what's so special about Fedora host - this 
> > > > is the first time I hear about issues with it. I may try experimenting with 
> > > > different VMs once I have more time...
> > > 
> > > I've been having a look at this. The biggest differences I can find
> > > between working and non working builds is the path length to the build
> > > directory for the kernel. This is from comparing vmlinux files from
> > > working and non working builds.
> > > 
> > > Works:
> > > /home/paul/poky/build/tmp/work/beaglebone-poky-linux-gnueabi
> > > 
> > > Doesn't Work:
> > > /media/data1/build1/poky/build/tmp/work/beaglebone-poky-linux-gnueabi
> > > 
> > > I also have been wondering if the version strings may be making a
> > > difference.
> > > 
> > > http://dan.rpsys.net/uImage-rp2 is a uImage from a broken build where I
> > > truncated the path length to a "working" build path length and patched
> > > in the same version strings:
> > > 
> > > const char linux_banner[] = 
> > >        "Linux version 3.14.0-yocto-standard (paul at ubuntu-build01) (gcc
> > > version 4.8.2 (GCC) ) #1 PREEMPT Mon Apr 14 16:00:52 BST 2014\n";
> > > 
> > > const char linux_proc_banner[] = "%s version %s (paul at ubuntu-build01)
> > > (gcc version 4.8.2 (GCC) ) %s\n";
> > > 
> > > to init/version.c.
> > > 
> > > I don't have hardware and would be interested to know if the kernel
> > > linked to above works or not. If it doesn't, it rules out these path and
> > > string lengths, if it does work, it points to a problem there.
> > 
> > Richard,
> > 
> > Good catch! It boots:
> 
> Thanks Denys, this helps narrow down the issue. I've shared
> http://dan.rpsys.net/uImage-rp3 which is the same as the last one but
> with my changes to version.c reverted. The one should tell us if its the
> paths or the strings.

This one also boots for me:

Linux version 3.14.0-yocto-standard (richard at ted) (gcc version 4.8.2 (GCC) ) #2 PREEMPT Tue Apr 15 05:40:19 IST 2014


> I'm guessing the path problem is more likely but anything is possible.
> This is starting to look like some kind of compiler or linker issue. If
> it is that, it would help to have more data points about what works and
> what doesn't. With that in mind could people who have good or bad builds
> please share the paths they built the kernels in so we can see if we can
> spot some kind of pattern.
> 
> Cheers,
> 
> Richard
>