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I would guess most 32-bit microcontrollers and any SoCs capable of running Linux have some sort of boot ROM, at least for the flash programming mode (especially

by dezgeg 3y ago

I would guess most 32-bit microcontrollers and any SoCs capable of running Linux have some sort of boot ROM, at least for the flash programming mode (especially if it's over USB).

calamari4065 3y ago
Pretty much, yeah. You'll usually see a boot ROM, but it will also have the ability to boot into flash so you can run your own bootloader. But the ROM is always there as a fallback and can't be destroyed.