Re: Help to test the powerpc architecture

[Santosh S <santosh@fossix.org>]

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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:
> 
> 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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