To my disappointment I discovered that there are no 64-bit drivers for the raspberry pi and HifiBerry boards.
So I installed the Ubuntu 21.04 server with the Ubuntu desktop on top of that, but I cannot seem to get any sound from the DAC+ DSP device.
I followed the instructions to modify the /etc/modprobe.d/blacklist.conf
(Added in blacklist i2c-bcm2708
and /etc/modules.conf for the DSP+ board,
(added in snd_soc_bcm2708
as well as the /etc/asound.conf., reboot - but still no sound.
When I display the sound options under settings, I only see option for a 'dummy device'
aplay -l does not show any device - no soundcards found
Also Ubuntu does not have /boot/config.txt so there is no way to enable toe DAC+ card.
Any idea where to go from here to get this to work ( without using raspbianOS)? Thanks