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I'm interested if Raspberry pi 4 bootloader does support boot from GPT partitioned disk?
The Pi4 can currently ONLY boot from a SD Card, although the Pi3 can boot from other media.
In ALL cases the boot partition MUST be the first partition on a MBR medium.
The root partition can be on another medium, which can be GPT, provided it is identified correctly (PARTUUID or device).
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