Gareth's Downstairs Computer wrote:
> AIUI, the GPU is used to boot the PI through its SD
> card interface.
>
> Is there any info around on the file format needed,
> as my interest (and professional experience going back
> over 40 years) is as a low-level OS and  driver bod?

https://www.raspberrypi.org/forums/viewtopic.php?f=72&t=72260

> Also, has anyone attempted to adapt a hard disk to
> emulate the SD card interface?

https://www.raspberrypi.org/documentation/hardware/raspberrypi/bootmodes/msd.md

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