Sergii Dmytruk a816c29882 payloads/external: add skiboot (for QEMU/Power9)

Add an option to build skiboot as a payload. This makes QEMU Power9
board simpler to use as skiboot is necessary anyway.

Change-Id: I0b49ea7464c97cc2ff0d5030629deed549851372
Signed-off-by: Igor Bagnucki <igor.bagnucki@3mdeb.com>
Signed-off-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58656
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>

2022-02-16 15:39:19 +00:00

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QEMU PPC64 emulator

This page describes how to build and run coreboot for QEMU/PPC64.

Building coreboot

make defconfig KBUILD_DEFCONFIG=configs/config.emulation_qemu_power9
make

This builds coreboot with no payload.

Payloads

You can configure ELF or skiboot payload via make menuconfig. In either case you might need to adjust "ROM chip size" and make it large enough to accommodate the payload (see how much space it needs in the error you get if it doesn't fit).

Running coreboot in QEMU

qemu-system-ppc64 -M powernv,hb-mode=on \
                  -cpu power9 \
                  -bios build/coreboot.rom \
                  -drive file=build/coreboot.rom,if=mtd \
                  -serial stdio \
                  -display none

The default CPU in QEMU for AArch64 is a 604. You specify a suitable PowerPC CPU via -cpu power9.
By default Hostboot mode is off and needs to be turned on to run coreboot as a firmware rather than like an OS.
-bios specifies initial program (bootloader should suffice, but whole image works fine too).
-drive specifies image for emulated flash device.

Running with a kernel

Loading skiboot (built automatically by coreboot or otherwise) allows specifying kernel and root file system to be run.

qemu-system-ppc64 -M powernv,hb-mode=on \
                  -cpu power9 \
                  -bios build/coreboot.rom \
                  -drive file=build/coreboot.rom,if=mtd \
                  -serial stdio \
                  -display none \
                  -kernel zImage \
                  -initrd initrd.cpio.xz

Specify path to your kernel via -kernel.
Specify path to your rootfs via -initrd.

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