Re: QEMU boot kernel for ppc e300c3 problem

[Thomas Huth]

On 04/09/2021 12.59, Ali Vatankhah wrote:
> I am new to QEMU. I built a Linux kernel 4.14 and rootfs for MPC8308 (this 
> CPU has e300c3 ppc core with Yocto (thud version) and it works on real 
> hardware well.
> When I run this command to run kernel with QEMU:
>
> qemu-system-ppc -kernel vmlinux.bin -nographic
>
> it prints this output and hangs up with 100% CPU usage on one CPU core:
>
>  >> =============================================================
>  >> OpenBIOS 1.1 [Mar 16 2021 08:16]
>  >> Configuration device id QEMU version 1 machine id 2
>  >> CPUs: 1
>  >> Memory: 128M
>  >> UUID: 00000000-0000-0000-0000-000000000000
>  >> CPU type PowerPC,750

You definitly need to select the right CPU type, too. So for your case, 
you'd need to add the "-cpu e300c3" command line switch. See "-cpu help" for 
a complete list.

But the CPU is only a part of the hardware, you also need to select a 
supported board with the "-M" command line parameter. See "-M help" for a 
list. I don't think that QEMU supports any machine that features the e300 
CPU, so your case likely does not work. You could try "-M ppce500", maybe 
you're lucky and that works, too, but I guess it will rather crash instead.

 Thomas