Re: H1940 Boot Issues -> Executable Build Problems?

[Russell Morris <openembedded@rkmorris.us>]

Hi,

 

Let me try to answer a few questions in one email ... :-). First of all, I tried the patch - unfortunately no joy. It does the same thing as earlier builds - let me try to explain, which will hopefully also answer the questions below.

 

I applied the patch, and rebuilt from scratch with the minimal distro (deleted the TMPDIR completely before building). I built the helloworld-image, to get a statically linked executable, and also because it's a pretty small (=faster) build.

 

I then looked at the helloworld executable, and a few interesting notes,

- if I readelf -h helloworld, it reports "Version5 EABI" ... so I assume arm5te still?

- if I try to run helloworld using qemu-arm, it runs fine ... with no cpu selected (but I did some checking, and the default cpu for qemu-arm is the arm5te). If I try to run with a -cpu arm920t option I get the error message "qemu: uncaught target signal 4 (Illegal instruction) - core dumped"

- I was not able to run this on the target right now, as I'm not near it ... but when I did before I either got a core dump (illegal instruction), or it said basically that the file was not found (depending on the executable I tried to run).

 

One more interesting fact - if I go inside TMPDIR, and then inside work/armv4t-oe-linux-gnueabi/gcc-cross-4.5-r28.0+svnr167948/gcc-4_5-branch/testsuite/gcc.target/arm, there is some sort of test file, with a filename of pr42235.c. Oddly enough the first line in this file says ... /* { dg-options "-mthumb -O2 -march=armv5te" }  */


Hopefully this all makes sense. I think this says that the executable is still targeting an armv5te ... but I could be wrong! Unfortunately it wouldn't be the first time I was off base, and certaintly it won't be the last ... :-(.

 

Thanks for all your help!

 

... Russell

 

 


On Wed, Jan 5, 2011 11:45  AM, Khem Raj <raj.khem@gmail.com> wrote:


> 
On Wed, Jan 5, 2011 at 7:11 AM, Phil Blundell <philb@gnu.org> wrote:
> > On Wed, 2011-01-05 at 08:48 -0600, Russell Morris wrote:
> >> Just to confirm - have you run these on an armv4t target? Only asking because my build completes fine, but the executables don't seem to run on the target.
> >
> > What exactly happens when you try to run those executables?  Have you
> > inspected them to see if they look like the right kind of thing, and/or
> > compared them to working ones?
> >
> > p.
> >
> >
> 
> 
> yes as Phil asked you should try to localize the offending code in the
> faulty binary. So try to enable
> kernel debugging messages so it tells you where its faulting.
> Secondly if you can take a working system
> and see if the new binary faults in same way ? if not then link the
> binary statically and run it again on working
> system and see if it faults again. If it does then you can debug it
> >
> > _______________________________________________
> > Openembedded-devel mailing list
> > Openembedded-devel@lists.openembedded.org
> > http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-devel
> >
> 
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