Handbook:AMD64/Blocks/Firmware
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SOF Firmware
Sound Open Firmware (SOF) is a new open source audio driver meant to replace the proprietary Smart Sound Technology (SST) audio driver from Intel. 10th gen+ and Apollo Lake (Atom E3900, Celeron N3350, and Pentium N4200) Intel CPUs require this firmware for certain features and certain AMD APUs also have support for this firmware. SOF's supported platforms matrix can be found here for more information.
root #emerge --ask sys-firmware/sof-firmware