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Cirrus Logic Audio Card on the Raspberry Pi 2 with Ubuntu

Former Member

I use Ubuntu MATE 15.04 https://ubuntu-mate.community/t/ubuntu-mate-15-04-for-raspberry-pi-2/517

Compared to raspbian, Ubuntu needs additonal steps and some folder paths and filenames are different.


Compiling the Kernel on the Pi 2

 

Compile the kernel on the Raspberry Pi 2 where Ubuntu is installed. You can find the building instructions in this link

https://github.com/CirrusLogic/rpi-linux/wiki/Building-the-code (follow the local build way not cross-compiling)

You may have to install some programs first (e.g. sudo apt-get install gcc) and don´t forget to expand your file system or you may run out of free space.

Ater compiling don´t copy the kernel7.img file to the boot folder. Ubuntu has this file in /boot/firmware where you also will find config.txt and the overlays folder.

I would recommend to make a backup of the original kernel7.img before replacing it with the new file.

  • Some settings have to be like in raspbian, but the filenames are different for the black list settings there is /etc/modprobe.d/rpi2.conf

    I edited it to look like this:

    #blacklist snd_soc_pcm512x_i2c

    blacklist snd_soc_pcm512x

    #blacklist snd_soc_tas5713

    #blacklist snd_soc_wm8804

    blacklist snd_bcm2835

     

    softdep arizona-spi pre: arizona-ldo1

    softdep spi-bcm2708 pre: fixed

     

    The settings in the config.txt file are the same as in raspbian, but the file is /boot/firmware/config.txt

     

    Additionally I needed to add a group for the GPIO connection:

    sudo groupadd -f --system gpio

    and I added the user to this group

     

     

     

    Also I created the files /lib/udev/rules.d/60-python3-pifacecommon.rules and /lib/udev/rules.d/60-python-pifacecommon.rules (I don´t know if it´s nessessary to have both of them). Both contain the same text:

    KERNEL=="spidev*", GROUP="spi", MODE="0660"

    SUBSYSTEM=="gpio*", PROGRAM="/bin/sh -c 'chown -R root:gpio /sys/class/gpio &&

    chmod -R 770 /sys/class/gpio; chown -R root:gpio /sys/devices/virtual/gpio &&

    chmod -R 770 /sys/devices/virtual/gpio'"