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Why don't cell phones have BIOS?
(lemmy.eco.br)
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ARM doesn’t specify a standard firmware interface like x86 PCs do.
I mean, they could, but ARM comes from a different era, where interoperability isn’t a requirement and devices are disposable instead of upgradeable.
There no incentive, no IBM PC to be compatible with, not even an Apple, Macintosh, Conmodore Amiga or Atari ST to make peripherals for. ARM devices, even the rPi, are one-and-done.