uxn for the nokia n900. very work-in-progress, it just about runs a hello world on an emulated device.
on real hardware it currently only runs for about 31 seconds before the external watchdog timer resets the device. i need to get i2c going to tell it to stop.
copy your chosen rom and the uxnemu.uimage to the first partition of an sd card (fat formatted). you must rename uxnemu.uimage to uImage. boot the device and run the following u-boot commands:
fatload mmc 0 0x801f0000 <your rom> run trymmcboot