I think the Hexagon runs an RTOS of some kind. It is not part of the PinePhone SoC, but is part of the modem SoC (which has Hexagon cores and ARM cores), which

I think the Hexagon runs an RTOS of some kind. It is not part of the PinePhone SoC, but is part of the modem SoC (which has Hexagon cores and ARM cores), which IIRC is soldered onto the PinePhone board separately to the main processor SoC. https://en.wikipedia.org/wiki/Qualcomm_Hexagon https://en.wikipedia.org/wiki/Qualcomm_Hexagon