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by jazzyjackson 530 days ago
Yep.

The "color gamut" display, as you call it, is a GPU test pattern, created by start.elf (or start4.elf, or one of the other start*.elf files, depending on what is booting). That 3rd stage bootloader is run by the GPU which configures other hardware (like the ARM cores and RAM split).

https://forums.raspberrypi.com/viewtopic.php?t=336516