en:c2_hifi_shield [ODROID Wiki]

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Quick installation guide to enable the I2S audio output on Ubuntu.

HiFi-shield & HiFi-Shield+

Assemble the C2 with the HiFi shield, attach a USB keyboard, USB mouse and HDMI monitor, then power up the system.
Update the System: sudo apt-get update && sudo apt-get dist-upgrade

To ensure that the HiFi shield kernel modules are loaded on Terminal.

odroid@odroid64:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S.27 dit-hifi-0 []
  Subdevices: 0/1
  Subdevice #0: subdevice #0
odroid@odroid64:~$
odroid@odroid64:~$ sudo modprobe snd-soc-pcm5102
odroid@odroid64:~$ sudo modprobe snd-soc-odroid-dac
odroid@odroid64:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S.27 dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ODROIDDAC [ODROID-DAC], device 0: I2S.27 pcm5102-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
odroid@odroid64:~$

To test, connect an amplifier to the 3.5mm or RCA lineout jack on the HiFi Shield, and then run:
Applications → Sound & Video → Sound → Hardware Tab & Output Tab select “ODROID-DAC”
If you want to use the Optical output on HiFi-Shile-Plus model, select “ODROID-HDMI”.

If you have to load the driver every time whenever your ODROID-C2 starts, simply you can register the driver into /etc/modules

odroid@odroid64:~$ su
Password:  /* root password is "odroid" */
root@odroid64:/home/odroid# echo "snd-soc-pcm5102" >> /etc/modules
root@odroid64:/home/odroid# echo "snd-soc-odroid-dac" >> /etc/modules
root@odroid64:/home/odroid# exit
exit
odroid@odroid64:~$

This adds one line at end of the file, /etc/modules, and load the driver on boot automatically.

Create /etc/asound.conf with the following content:

pcm.!default  {
 type hw card 1
}
ctl.!default {
 type hw card 1
}

Reboot again.

Check, if the sound card is enabled with “aplay -l”:

odroid@odroid64:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S.27 dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ODROIDDAC [ODROID-DAC], device 0: I2S.27 pcm5102-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
odroid@odroid64:~$

HiFi-shield2

Assemble the C2 with the HiFi shield, attach a USB keyboard, USB mouse and HDMI monitor, then power up the system.
Update the System: sudo apt-get update && sudo apt-get dist-upgrade