So I just tried my current set up with the head of lsk-android and still get the boot failure.
Tried then building in as INITRAMFS_SOURCE and see this in the kernel log:
[ 22.541380] Trying to unpack rootfs image as initramfs... [ 24.752456] Freeing initrd memory: 5068K (ffffffc007b0c000 - ffffffc007fff000)
(this is using the initramfs you sent the link to earlier Mark)
Then I get this:
[ 25.603992] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100
And a generic set of walkbacks from the stop IPI.
Mark