[Qemu-devel] How to run "qemu-system-aarch64" without "-kernel" parameter?

[Sudheesh PM]

I amusing qemu-system-aarch64 (version 2.1.0) to run aarch64 on ARM64 machine 
using openstack.I am facing difficulty in passing "kernel" parameter. How to 
boot a virtual machine without passing "-kernel" option?
I want to use only  "- drive file=rootfs.img" for booting.  please help.
Regards,Sudheesh