Help to test the powerpc architecture

[jim.cromie at gmail.com]

On Mon, Aug 10, 2020 at 3:15 AM Santosh S <santosh at fossix.org> wrote:
>
> On Sunday, 2 August, 2020 7:57:03 PM IST Oscar Carter wrote:
> > Hi,
> >
> > I'm working in a new feature for the powerpc (64 bits little endian)
> > architecture. Since I can't test it in a real environment, I need to
> > emulate this arch. To do this I use qemu-ppc. My problem is that the
> > built kernel don't boot in qemu.
> >
> > To build the kernel:
> >

I would recommend you try virtme, particularly virtme-config-kernel

[jimc at frodo build-v1]$ virtme-configkernel --help
usage: virtme-configkernel [-h] [--arch ARCHITECTURE] [--allnoconfig |
--defconfig | --update]

Configure a kernel for virtme

optional arguments:
  -h, --help           show this help message and exit
  --arch ARCHITECTURE  Target architecture

Mode:
  --allnoconfig        Overwrite configuration with a virtme-suitable
allnoconfig (unlikely to work)
  --defconfig          Overwrite configuration with a virtme-suitable defconfig
  --update             Update existing config for virtme



> > make defconfig ARCH=powerpc
> >
> > Then I set to NO the CONFIG_KEXEC option as I found that qemu can't
> > boot a KEXEC kernel. And now:
> >
> > make ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu- -j4
> >
> > Finally I obtain a zImage in arch/powerpc/boot/ directory.
> >
> > Before to run qemu I create a rootfs with debootstrap. Then I run qemu
> > with the following parameters:
> >
> > qemu-system-ppc -kernel /media/ubuntu/Data/linux/arch/powerpc/boot/zImage \
> >               -append "root=/dev/sda console=ttyS0" \
> >               -drive file=qemu_image.img,index=0,media=disk,format=raw \
> >               --nographic
> >
> > If I add the "-prom-env boot-args=-v" to the end of the last command I get
> >
> > the same result. The qemu always stops at this point:
> > >> =============================================================
> > >> OpenBIOS 1.1 [Dec 27 2018 23:11]
> > >> Configuration device id QEMU version 1 machine id 2
> > >> CPUs: 1
> > >> Memory: 128M
> > >> UUID: 00000000-0000-0000-0000-000000000000
> > >> CPU type PowerPC,750
> >
> > milliseconds isn't unique.
> > Welcome to OpenBIOS v1.1 built on Dec 27 2018 23:11
> >
> > >> [ppc] Kernel already loaded (0x01000000 + 0x009085d8) (initrd 0x00000000
> > >> + 0x00000000) [ppc] Kernel command line: root=/dev/sda console=ttyS0
> >
> > >> switching to new context:
> > Also, I've tried to build the kernel with a DTB embedded in the image,
> > but not luck. The same result again.
> >
> > make ps3_defconfig ARCH=powerpc
> > make ARCH=powerpc simpleImage.ps3 CROSS_COMPILE=powerpc-linux-gnu- -j4
> >
> > I'm stuck at this point. I don't know how to configure the kernel to be
> > able to boot with qemu. Any help to point me to the right direction
> > will be greatly appreciated.
>
> I used `pseries_defconfig` and have also used `pseries_le_defconfig` and
> have done successful boots. You should probably give the machine type in
> your qemu command line.
>
> `-M pseries`
>
> or whatever is the machine type is for ps3
>
> Thanks,
> Santosh
>
> >
> > Thank's in advance.
> > Oscar Carter
> >
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