Cirrus Logic (new Wolfson) on rPi B+

[mashman]

Hi All,

Does anyone have any instructions on getting the Cirrus Logic (wolfson) card working on the rPi B+? I assumed it would be the same as the previous version but everytime i switch the kernel over to Wolfson, all of the USB ports and the Ethernet port stop working entirely.

Do i have to compile the kernel myself? is there another way? I've tried updating via pacman and gitpull but the results are the same.

cheers,

t

[mashman]

Hi All,

There has not been a lot of talk about this new cirrus card, i'm not sure why. I've managed to get it working now but i fumbled my way through.

This is not ideal so i'd love some feedback and/or better ways to do this, perhaps even include support for the cirrus in the next release.

I attempted to compile my own kernel following instructions from here, here, and here. I got it compiled (cross compiled on my arch box) but something was not happy on boot so i looked elsewhere.

I found that someone had already compiled one for the cirrus card.... here (sorry, i lost track of the source).

From there, i copied the kernel.img to /boot and extracted the modules to the folder /lib/modules/3.12.33

I edited the /boot/config.txt to comment out the old lines and add in

Code: Select all

kernel=kernel.img
cmdline=cmdline_linux-arch-rpi_3.12.26-1-ARCH.txt


Hooray, on reboot i get...

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[root@runeaudio ~]# uname -a
Linux runeaudio 3.12.33 #1 PREEMPT Tue Dec 30 19:52:03 PST 2014 armv6l GNU/Linux


My lsmod can be found here.

I also had to run the appropriate scripts found at http://www.runeaudio.com/forum/wolfson-audio-card-patch-for-runeaudio-t213-30.html?hilit=script#p1817

There was mention on the cirrus github page that i had to blacklist modules so i edited/added /etc/modprobe.d/raspi-blacklist.conf

Code: Select all

#blacklist spi-bcm2708
#blacklist i2c-bcm2708
blacklist snd-soc-pcm512x
#blacklist snd-soc-wm8804
softdep arizona-spi pre: arizona-ld


here's the kernel config for those interested..... i ran a 'zcat /proc/config.gz >.config' to here... http://pastebin.com/5mB8L7pQ

It took a few goes and reboots and fiddling so this may not be the best instructions for a total noob but its all i've seen on this forum so far so i though it's worth getting the conversation going. If we could refine this, i have a few extra questions.

- How do i add extra kernel items to the kernel menu within the rune settings?
- I'm not sure if this works without running a gitpull from the dev settings. Through my fumbling, I tried all the things.
- If anyone has some observations or suggestions on the config, that would be nice.
- Is there someone out there with patching skills? it would be nice to be able to just add the modules to the stock kernels.