@tooz
Since I am a Linux beginner, I don't understand how overlays work etc.
I would like you to tell me in detail
how to set it to recognize the HiFiBerry DAC, for example.
I tried various things such as editing the "/boot/config.txt" file with reference to the Raspberry Pi article,
but "rkhdmidpsound" is displayed even if I run the "aplay -l" command.
Also, in my environment, there is only hifiberry-dacplus in /boot/overlays, and other overlays such as hifiberry-dac cannot be found.
Does this require installation?