How to boot an image in Qemu?

[srulop]

I'm trying to run the Odroid-X image in Qemu.
Since Qemu does not emulate this board, I had to use another kernel - from Fedora image for Versatile Express.

But the problem so far is that the root partition is not recognized at all. I run it with the command:
$this->bbcode_second_pass_code('', 'qemu-system-arm -M vexpress-a9 -m 640M -nographic -net nic -net user -append "console=ttyAMA0,115200n8 rw root=/dev/sda2 rootwait" -kernel vmlinuz-3.6.10-8.fc18.armv7hl -hda ArchLinuxARM-odroidx-latest.img')
and get:
$this->bbcode_second_pass_code('', 'Waiting for root device /dev/sda2...')
Of course I tried all combinations of -hda, -sd, /dev/mmcblk0p1,2,3, /dev/sda1,2,3...
Where is my mistake?