So far the development team has managed to get a serial driver, frame buffer driver, serial over USB driver and Interrupts and MMU Clock. They also have read-only support for the NAND, but it has not been ported over yet. In the future we will see support for sound, accelerometer, baseband support, touchscreen, write support for the NAND and wireless networking.
As with all first advancements this is still just a rough draft of the port. Even though the alternate operating system is running on the iPhone, many drivers are missing.