uml with minimal debian

Build kernel:

1. get kernel

2. make ARCH=um defconfig

3. make ARCH=um menuconfig ; to remove options you don't need

4. make -j 12 ; parallel build

Build rootfs:

dd if=/dev/zero of=my.rootfs bs=1M seek=512 count=0
mkfs.ext2 -F my.rootfs

mkdir rootfs
sudo mount -o loop my.rootfs rootfs
sudo debootstrap --arch=i386 --variant=minbase lucid rootfs