[yocto] BBB doesn't boot

[Denys Dmytriyenko]

On Tue, Apr 15, 2014 at 01:07:28AM -0400, Denys Dmytriyenko wrote:
> 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.

BTW, my path is /OE/RAM/poky/tmp/work/beaglebone-poky-linux-gnueabi and it 
works.

-- 
Denys