The question then became: how far was I making it into the boot process? To answer this, I had to start looking at XNU source code. The first code that runs is a PowerPC assembly _start routine. This code reconfigures the hardware, overriding all of the Wii-specific setup that the bootloader performed and, in the process, disables bootloader functionality for serial debugging and video output. Without normal debug-output facilities, I’d need to track progress a different way.
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