openwrtv4/target/linux/armvirt/README
Yousong Zhou 88468f7e53 armvirt: merge arm64 as subtarget 64
Original armvirt target is now subtarget 32.  Other than that the built
result should remain the same as before

Besides old features already available with arm64, the new armvirt/64
subtarget will also have those features originally enabled for
armvirt/32 with commit 44ecfc2 ("armvirt: new target")
 - pl011, uart
 - pl031, rtc
 - pl061, gpio
 - pci-host-generic
 - virtio_{mmio,pci,net,blk,scsi,9p,console,balloon}
 - smp with NR_CPUS=4
 - cpu-hotplug
 - ext4
 - DEBUG_BUGVERBOSE for debug purposes

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
2017-04-23 09:19:33 +08:00

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This is intended to be used with LEDE 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 lede-armvirt-32-zImage-initramfs
# boot with accel=kvm
qemu-system-arm -nographic -M virt,accel=kvm -cpu host -m 64 -kernel
lede-armvirt-32-zImage-initramfs
# boot with a separate rootfs
qemu-system-arm -nographic -M virt -m 64 -kernel lede-armvirt-32-zImage \
-drive file=lede-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 lede-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 lede-armvirt-32-zImage -i lede-armvirt-32-rootfs.cpio --name armvirt0
# start with virtio-9p rootfs
lkvm run -k lede-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 lede-armvirt-64-Image-initramfs \