I guess I am mainly trying to figure out which options work for people. I tried choosing:

# grep . options/selected_* | cut -c-80
options/selected_firmware_source:meego
options/selected_image_source:ubuntu-core
options/selected_kernel:nemo
options/selected_target:/dev/sdc
options/selected_target_type:disk

but that just yields a boot directory looking like:

total 5084
-rw-r--r-- 1 root root 300 Jul 18 20:49 boot.script
-rw-r--r-- 1 root root 62453 Jun 26 14:33 config-2.6.37-10.7.Nemo.Adaptation.N900-adaptation-n900
-rw-r--r-- 1 root root 1170840 Jun 26 14:33 System.map-2.6.37-10.7.Nemo.Adaptation.N900-adaptation-n900
-rw-r--r-- 1 root root 1972136 Jun 26 14:33 uImage
-rwxr-xr-x 1 root root 1972072 Jun 26 14:33 vmlinuz-2.6.37-10.7.Nemo.Adaptation.N900-adaptation-n900

i.e. no ramdisk.

If folks have options which seem to work out-of-the box then that would be great. Else I'll work through the permutations

[EDIT]

I ended up creating a ramdisk with:

update-initramfs -c -k 2.6.37-10.7.Nemo.Adaptation.N900-adaptation-n900
ln -s initrd.img-2.6.37-10.7.Nemo.Adaptation.N900-adaptation-n900 initrd.img
mkimage -A arm -O linux -T ramdisk -C none -a 0 -e 0 -n initramfs -d /initrd.img /uInitrd