Re: [Qemu-devel] [PATCH] target-openrisc: Fix exception handling status registers

[Richard Henderson <rth@twiddle.net>]

On 01/24/2017 02:26 AM, Stafford Horne wrote:
> If you are having problems booting, both mainline (4.10-rc5) and
> linux-next (i.e. next-201701124) should be able to boot. i.e.
> 
>   export ARCH=openrisc
>   make defconfig   # defconfig works fine on qemu
> 
>   # make any updates to CONFIG_CROSS_COMPILE needed
>   make
> 
>   # start qemu
>   qemu-system-or32  -cpu or1200 -M or32-sim -kernel $LINUX/vmlinux \
>    -serial stdio -nographic -monitor none
> 
> I just ran those commands with linu-next and my qemu patches and the
> kernel can boot, but note fails to find init due to config missing
> initramfs, which I figure you know thats expected.
> 
> Let me know what you tried and what problem you are having.

I've tried booting linux-next and mainline, both from yesterday.

According to the trace from qemu (-D z -d in_asm,exec), I execute

./or32-softmmu/qemu-system-or32 -cpu or1200 -M or32-sim \
    -kernel ~/work/linux/bld-or/vmlinux -append console=ttyS0 \
    -serial stdio -nographic -monitor none \
    -D z -d in_asm,exec,int,op_opt

...
Trace 0x7f501130a880 [0: c036c650] setup_cpuinfo
Trace 0x7f501130a990 [0: c036c65c] setup_cpuinfo
Trace 0x7f501130aaa0 [0: c0069774] panic
...
Trace 0x7f5011312b70 [0: 000001fc]
Trace 0x7f5011312b70 [0: 000001fc]

That last block repeats forever.

The qemu I'm using is

  git://github.com/rth7680/qemu.git tgt-or1k-2

which has your patch, l.lwa/swa, and a cleanup to the disassembly trace.

Looking at the kernel source I would hazard a guess that it's

>         cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
>         if (!cpu)
>                 panic("No compatible CPU found in device tree...\n");

which suggests some large configuration error.


r~