I am trying to boot xen on hikey board, following this wiki
However, I am stucked at the step of installing rootfs, "For example you
could dd a CentOS 7 ARM64 rootfs to the microSD".
I am using ubuntu machine, and the FAT partitioned microSD card showed up
as "/dev/mmcblk0". So I did "sudo dd if=CenOs-7-aarch64-rolling.img
After image was written, I tried to mount it
"sudo mount -t vfat /dev/mmcblk0 /mnt/mysd".
It failed to mount, saying "wrong fs type, bad option, bad superblock on