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openwrt/target/linux/armvirt
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Paul Spooren 4056a40160 armvirt: enable MMIO_CMDLINE_DEVICES for firecracker support 
This Kernel option allows to run OpenWrt witin a `firecracker` micro VM.

Firecracker is a KVM-based tool for superfast booting VMs on x86_64 and
aarch64. It makes rootfs available to the guest as a virtio-mmio device
and passes its address via the kernel cmdline. A kernel without
CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES will not recognize the rootfs
virtio-mmio device.

Suggested-by: Packet Please <pktpls@systemli.org>
Signed-off-by: Paul Spooren <mail@aparcar.org>
2021-10-12 19:22:08 -10:00
..
32 armvirt: remove obsolete Kernel 5.4 2021-10-02 18:13:46 +02:00
64 armvirt: remove obsolete Kernel 5.4 2021-10-02 18:13:46 +02:00
base-files/etc treewide: remove execute bit and shebang from board.d files 2021-03-06 11:30:06 +01:00
image
config-5.10 armvirt: enable MMIO_CMDLINE_DEVICES for firecracker support 2021-10-12 19:22:08 -10:00
Makefile armvirt: switch to Kernel 5.10 2021-10-01 10:46:28 -10:00
README

README 

This is intended to be used with OpenWrt project to provide image for use with
QEMU ARM virt machine.

Run with qemu-system-arm

	# boot with initramfs embedded in
	qemu-system-arm -nographic -M virt -m 64 -kernel openwrt-armvirt-32-zImage-initramfs

	# boot with accel=kvm
	qemu-system-arm -nographic -M virt,accel=kvm -cpu host -m 64 -kernel
	openwrt-armvirt-32-zImage-initramfs

	# boot with a separate rootfs
	qemu-system-arm -nographic -M virt -m 64 -kernel openwrt-armvirt-32-zImage \
	  -drive file=openwrt-armvirt-32-root.ext4,format=raw,if=virtio -append 'root=/dev/vda rootwait'

	# boot with local dir as rootfs
	qemu-system-arm -nographic -M virt -m 64 -kernel openwrt-armvirt-32-zImage \
	  -fsdev local,id=rootdev,path=root-armvirt/,security_model=none \
	  -device virtio-9p-pci,fsdev=rootdev,mount_tag=/dev/root \
	  -append 'rootflags=trans=virtio,version=9p2000.L,cache=loose rootfstype=9p'

Run with kvmtool

	# start a named machine
	lkvm run -k openwrt-armvirt-32-zImage -i openwrt-armvirt-32-rootfs.cpio --name armvirt0

	# start with virtio-9p rootfs
	lkvm run -k openwrt-armvirt-32-zImage -d root-armvirt/

	# stop "armvirt0"
	lkvm stop --name armvirt0

	# stop all
	lkvm stop --all

The multi-platform ARMv8 target can be used with QEMU:

	qemu-system-aarch64 -machine virt -cpu cortex-a57 -nographic \
		-kernel openwrt-armvirt-64-Image-initramfs \