bsp/qemu-vexpress-a9/qemu.sh

if [ ! -f "sd.bin" ]; then
dd if=/dev/zero of=sd.bin bs=1024 count=65536
fi

qemu-system-arm --version
qemu-system-arm -M vexpress-a9 -smp cpus=2 -kernel rtthread.bin -serial stdio -sd sd.bin