Re: [Qemu-discuss] Custom board with DTS/DTB

[Peter Maydell]

On 7 December 2016 at 20:31, James Hanley <address@hidden> wrote:
> Seems like I spoke too soon. Removed the DTB option and started down the
> road of building up our board as a test and connect gdb to the target with
> the --gdb option.

> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> Core was generated by `qemu-system-arm -M Boardx24 -m 256 -cpu cortex-m4
> -no-reboot -nographic -S -singl'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  gic_test_pending (cm=<optimized out>, irq=<optimized out>, s=<optimized
> out>)
>     at /home/jim/project/test/qemu/hw/intc/gic_internal.h:90
> 90    if (s->revision == REV_NVIC || s->revision == REV_11MPCORE) {
> [Current thread is 1 (Thread 0x7f9c1758f700 (LWP 3256))]
> (gdb) bt
> #0  gic_test_pending (cm=<optimized out>, irq=<optimized out>, s=<optimized
> out>)
>     at /home/jim/project/test/qemu/hw/intc/gic_internal.h:90
> #1  gic_set_pending_private (s=0x0, cpu=0, irq=6)
>     at /home/jim/project/test/qemu/hw/intc/arm_gic.c:136
> #2  0x000056402fabe233 in cpu_handle_exception (ret=<synthetic pointer>,
> cpu=0x56403223c720)
>     at /home/jim/project/test/qemu/cpu-exec.c:442
> #3  cpu_exec (address@hidden) at
> /home/jim/project/test/qemu/cpu-exec.c:631
> #4  0x000056402fae7b36 in tcg_cpu_exec (cpu=0x56403223c720)
>     at /home/jim/project/test/qemu/cpus.c:1117
> #5  qemu_tcg_cpu_thread_fn (arg=<optimized out>) at
> /home/jim/project/test/qemu/cpus.c:1197
> #6  0x00007f9c2185b6ba in start_thread (arg=0x7f9c1758f700) at
> pthread_create.c:333
> #7  0x00007f9c2159182d in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
> (gdb)

Looks like the CPU's pointer to the NVIC is NULL. This
pointer is set up for you by armv7m_init() -- is your
board/SoC code actually calling that function? Look at
the existing M profile boards like netduino2 to see
how this ought to work.

thanks
-- PMM