Update for Wolfson Audio Card ( on Raspberry Pi)

Hi,

this is just an update for those who use the older Wolfson Audio Card. You can download it here or simply fire up your Raspberry Pi and install it directly. The kernel sources are from Cirrus Logic’s 3.12.33 kernel. This kernel is patched with the realtime preemption patches from https://www.kernel.org/pub/linux/kernel/projects/rt/ So now you should have a realtime linux system running on your Raspberry Pi for making LIVE MUSIC or other things.

THIS WON’T WORK FOR THE NEW RASPBERRY PI 2!

The kernel is running on a standard Raspberry Pi Debian Wheezy image  2015-02-16 which you can download from http://www.raspberrypi.org/downloads/

On Raspberry Pi, open a shell and type

wget https://blog.georgmill.de/wp-content/uploads/2015/02/linux-image-3.12.33-rt47-georg_3.12.33-rt47-georg-1_armhf.deb

Then install it with

dpkg -i linux-image-3.12.33-rt47-georg_3.12.33-rt47-georg-1_armhf.deb

sudo mv /boot/vmlinuz-3.12.33-rt47-georg /boot/kernel-rt-georg.img

Thanks for Ragnar Jensen’s patch for memory mapped I/O support to the Wolfson/Cirrus card.

A slightly modified version of this patch can be found here.

Change boot options in /boot/config.txt with

sudo nano /boot/config.txt

and change OR add this line:

kernel=kernel-rt-georg.img

Open  /etc/modules  with

sudo nano /etc/modules

and change OR add these lines:

spi-bcm2708
i2c-bcm2708
arizona-spi
snd-soc-wm5102
snd-soc-pcm5102a
snd-soc-wm8804
snd-soc-rpi-wsp
snd-soc-rpi-wsp

bcm2708-rng
snd-bcm2835
gpio_arizona
arizona_micsupp
snd_soc_bcm2708_i2s
snd-soc-arizona
snd-soc-wm-adsp
snd-soc-wm5102
snd-soc-rpi-wsp

Open /etc/modprobe.d/raspi-blacklist.conf with

 

 

Ein Midipad ganz preiswert

Das Düsseldorf Festival hat mich in diesem Jahr ganz besonders begeistert. Vor allem war es eine Veranstaltung: Ganz junge Menschen aus einem Slum-Viertel bauen Instrumente wie Geigen, Saxophon, Querflöte und Schlagzeug aus Müll. Ja, richtig gelesen: aus Abfall. Und dann spielen sie auf diesen Instrumenten Klassik, Pop und Rock in einer ungeahnten Qualität. Das Orchester heißt Orquesta de Instrumentos Reciclados de Cateura und ist hier auch auf  Youtube zu finden.
Das hat mich zum Nachdenken gebracht: Muss es immer etwas „Neues“ sein, damit es im Leben Spaß macht? Nein!!!
Wie man mit wenig Geld ein Midipad baut und am Computer anschließt, kann man in folgenden Video sehen.
Viel Spaß!

Compile Wolfson Audio Card driver for kernel 3.12.y , a new try

The easy way:

# Download the binaries from here:

sha1sum   kernelAndFirmware_wolfson_rt.tar.bz2 is

76c3b38f588f09ae6a557f3065ce9dc30674615b kernelAndFirmware_wolfson_rt.tar.bz2

mkdir kernelAndFirmware_wolfson_rt

Extract:

tar -xvjf kernelAndFirmware_wolfson_rt.tar.bz2 -C kernelAndFirmware_wolfson_rt

and copy to root of the Raspberry pi.

sudo nano /boot/config.txt

change

kernel=kernel.img

to

# kernel=kernel.img

kernel=kernel_new.img

sudo sync

sudo reboot

or do it the hard way 😉

 

Read  Compile and install as described here -> http://elinux.org/RPi_Kernel_Compilation

# Download the sources
# RPI-Kernel

Download rpi-3.12.y_rt_wlfsn.tar.bz2

sha1sum rpi-3.12.y_rt_wlfsn.tar.bz2 is

523f06ab89088e9cf8384c7dd9551c2fc74b2598  rpi-3.12.y_rt_wlfsn.tar.bz2
tar -xvjf rpi-3.12.y_rt_wlfsn.tar.bz2 -C rpi-3.12.y_rt_wlfsn
cd rpi-3.12.y_rt_wlfsn
Download  rpi-3.12.y_rt_wlfsn.config into rpi-3.12.y_rt_wlfsn directory and change it to .config
export ARCH=arm
export CROSS_COMPILE=/path/to/your/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-
export INSTALL_MOD_PATH=/your/modules/dir/path
mv config.txt .config
make -j4  ARCH=arm CROSS_COMPILE=${CROSS_COMPILE} mrproper
make -j4  ARCH=arm CROSS_COMPILE=${CROSS_COMPILE} xconfig
# make your changes here
make -j4  ARCH=arm CROSS_COMPILE=${CROSS_COMPILE}
make -j4  ARCH=arm CROSS_COMPILE=${CROSS_COMPILE} modules
make -j4  ARCH=arm CROSS_COMPILE=${CROSS_COMPILE} modules_install
# Have fun.