(One "scary" aspect of many SoC's is it's often technically the undocumented DSP that's in control on power-on, with it providing at the lowest level the basic storage device/file system support to grab the necessary blobs and an ARM bootloader off the flash filesystem. So again, another point for staying away from SoC's if dealing with "firmware" isn't something you want to have to do. There's no way to escape it.)

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