download smali-1.2.3.jar and baksmali-1.2.3.jar into this directory from http://code.google.com/p/smali/downloads/list
download android-2.1 source mkdir android-2.1 cd android-2.1 repo init -u git://github.com/OpenEtna/android_manifest.git -b eclair repo sync
build the source: cd android-2.1 ./doBuild your boot.img can then be found under out/target/product/openetna/boot.img
build system.img / system.ext2.img goto my-system and read README