qemu-aarch64-static0: unable to find CPU model 'cortex-a76'

[wrljet]

Is there a way for this to include a newer (or patched) qemu to support cortex-a76, such as found in Raspberry Pi 5?

++ sudo chroot /home/actions/temp/arm-runner/mnt /bin/sh -c 'command -v /bin/sh'
qemu-aarch64-static0: unable to find CPU model 'cortex-a76'

See: this qemu patch

Thanks for any assistance,
Bill

[bvobart]

Going by

arm-runner-action/action.yml

Lines 102 to 127 in 98b8d5a

	- name: Install qemu wrapper
	shell: bash
	run: |
	case ${{ inputs.cpu }} in
	"")
	cpu="arm1176:cortex-a53"
	;;
	arm1176)
	cpu="arm1176:cortex-a53"
	;;
	cortex-a7)
	cpu="cortex-a7:cortex-a53"
	;;
	cortex-a8)
	cpu="cortex-a8:max"
	;;
	cortex-a53)
	cpu="max:cortex-a53"
	;;
	*)
	cpu=${{ inputs.cpu }}
	esac
	arm_cpu=${cpu%:*}
	aarch64_cpu=${cpu#*:}
	sudo gcc -static ${{ github.action_path }}/qemu-wrapper.c -DQEMU_CPU=${arm_cpu} -O3 -s -o /usr/bin/qemu-arm-static0
	sudo gcc -static ${{ github.action_path }}/qemu-wrapper.c -DQEMU_CPU=${aarch64_cpu} -O3 -s -o /usr/bin/qemu-aarch64-static0

it seems that you could input this yourself through the cpu parameter for this action, provided that the latest version of QEMU bundled with Ubuntu 22.04 (currently the default image used by this action) supports it.

[pguyot]

Exactly. This can be achieved by:

• using a container or runner that has an apt package with the qemu patch and installing them, so that:
  apt install -y qemu qemu-user-static
  doesn't overwrite the patched qemu version
• passing cpu parameter.

Question is: what is the use case where exactly emulating the Raspberry Pi 5 CPU makes sense. Is it worth the effort and the longer CI time?

[pguyot]

Ubuntu 22.04 indeed features a rather old version of qemu.
You can upgrade to 24.04 once PR #111 is merged, and then you will be able to pass cortex-a76 in cpu option.