I have an IQaudio dac+ card and am trying to get it to work with Sonic Pi. This (normally) uses jackd to connect to the inbuilt BCM2835 sound module, but I can't get jackd to connect to the IQaudio card. It says mmap-based access is not possible for this card. Anyone managed to get this to work or have any suggestions?
I gather the HiFiBerry DAC+ card has the same problem.
The IQaudio card woks ok otherwise eg aplay -D hw:0 test.wav works fine.
Running on a Pi2 with latest Raspian distro, and sound card configured using device_tree_overlay iqaudio-dacplus-overlay.dtb set up in the boot config.txt file