how to use qemu to run build root linux images?

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http://unix.stackexchange.com – I have compiled an embedded linux with build root for i386. I didn't edited much, just defaults. Now I want to run it under qemu. But the only thing I see is this: I'm running qemu with these options: qemu-system-i386 -kernel vmlinux -hda rootfs.ext2 -m 256 Why this is happening? I have compiled like the example in the buildroot documentation. (HowTos)