MainFirmware 3 Hardware Folder 5 DIGiC ARM Processor Special Purpose HW (ASIC, MPEG, Timers) Timers Flash RAM Tx19A Other Chips Task Folder 3 GUI Task Folder 3 DryOS Messaging System Drivers Task Magic Lantern Task Interrupts Canon EOS boot process 3 Reset Firmware OK? Bootflag set? Firmware File? autoexec.bin? exec autoexec.bin FROM-Utility FW update Boot OS (MainFirmware) ML pre-init hook into boot Bootloader Magic Lantern Main Firmware Yes No Yes Yes No No No No Access