Sample booter for XNU
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- Requires 'mkimage' from u-boot to generate uImage.
- Builds using arm-none-eabi toolchain for ARMv7 architecture.
- Targeted towards ARM RealView PB-A8 board configuration.
- Can boot from u-boot if you modify it for your board configuration.
- Maybe sort of buggy.
- Mach kernel should be in image3 form as 'mach.img3', type is 'krnl', just have DATA and TYPE
 in the Image3 file.
- This bootloader isn't perfect.