Raspberry Pi BSP debugging

[Alan Cudmore]

Great idea. It should be easy enough to try, and it looks like the bit to
enable unaligned access is not set in the BSP.

Thanks,
Alan



On Wed, May 1, 2013 at 10:38 AM, Gedare Bloom <gedare at rtems.org> wrote:

> Could it be a matter of the compiler (not) knowing the correct
> alignment for the target architecture?
>
> To quote Sebastian from a recent post: "Please have a look in the
> ARM1176JZF-S manual.  You may have to enable the unaligned access in
> the CP15."
>
> -Gedare
>
> On Wed, May 1, 2013 at 10:16 AM, Alan Cudmore <alan.cudmore at gmail.com>
> wrote:
> > I'm trying to track down a bug in the Raspberry Pi BSP. It will be much
> > easier once I get a JTAG device, but for now I have been able to narrow
> down
> > one specific instance where the BSP hangs.
> >
> > The first symptom of this problem was with a shell example. If I type an
> > invalid shell command, I noticed it will hang or crash on the strncat
> > function.
> >
> > Next, I modified the simple hello world sample and found that it will
> also
> > hang with a strncat call. I copied the strncat function from the newlib
> > sources and found that the local copies ( optimized for size and speed )
> > work. The attached example shows the two local strncat calls followed by
> the
> > newlib call. It will always hang on the newlib call.
> >
> > This example works on the arm920/gdb simulator and the sparc-sis
> simulator.
> >
> > Some other notes;
> > - The memory map looks reasonable, comparing it to the arm920 map
> > - Many other newlib functions work such as strncpy, printf, etc
> > - Much of the other basic RTEMS seem to work as well. I can create a RAM
> > disk, format it , mount it, copy files, etc. I ran many of the tests
> such as
> > unlimited, ticker, etc.
> >
> > If anyone has an idea I can try let me know. Otherwise I might just wait
> > until I can get a JTAG device hooked up.
> >
> > Thanks,
> > Alan
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> > rtems-users mailing list
> > rtems-users at rtems.org
> > http://www.rtems.org/mailman/listinfo/rtems-users
> >
>
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