I've always been curious how MagicLantern achieves this.
Wouldn't the original firmware need code to boot from SD? Maybe it automatically checks for new firmware on the card and then gets exploited from there? Does anyone know?
I always imagined it like a BIOS setting allowing you to choose boot device order. The camera looks to see if something is available on the card first, if not then it just boots to camera. It's been so long since I've set up my camera to use ML, but I know I had to upgrade the firmware to a compatible version. Then IIRC, you load the ML data on the card and tell the camera to upgrade firmware again. So it maybe something that it thinks it is a firmware upgrade but just hijacks that process to boot a full thing instead. ???
Wouldn't the original firmware need code to boot from SD? Maybe it automatically checks for new firmware on the card and then gets exploited from there? Does anyone know?