Hello,justin,
Please see android user's guide for R13.4.1
5.4 Build boot.img
As outlined in Run Android with Prebuilt Image, we use boot.img and booti as default commands to boot, not the uramdisk
and uImage we used before.
You can use this command to generate boot.img under Android environment:
$ cd ~/myandroid
$ source build/envsetup.sh
$ lunch sabresd_6dq-user
$ make bootimage
Weidong