DIY Kernel: CirrusLogic's "Build the Code" Instructions Don't Work

RE: DIY Kernel: CirrusLogic's "Build the Code" Instructions Don't Work

e14 Contributor — Mon, 06 Apr 2015 12:40:13 GMT

Try https://blog.georgmill.de/2015/04/06/update-rt-kernel-for-cirrus-logicwolfson-audio-card/

Have fun.

RE: DIY Kernel: CirrusLogic's "Build the Code" Instructions Don't Work

timg73 — Thu, 05 Mar 2015 21:12:25 GMT

Hi Bob,

I agree that the compilation instructions aren't wonderful. I did not attempt cross-compilation, and followed the normal process for native compilation of a generic Debian kernel. This worked well for me on a fresh installation of Raspbian, and although it took about 10 hours to complete I wasn't in a rush and just left it to run over night. Note that the wiki instructions download much more data than necessary. Replace the git-clone command by

git clone --depth 1 https://github.com/CirrusLogic/rpi-linux.git

Alternatively you can skip downloading and compiling the source entirely. I've compiled the most recent "Cirrus Logic" kernel and uploaded it as a Debian package. You can find it here:

http://www.element14.com/community/thread/40824/l/kernel-as-deb-package

Install as described, and modify /etc/modules & /etc/modprobe.d/raspi-blacklist.conf as detailed in the wiki.

I'm not sure why Cirrus Logic don't distribute their patched kernel as a package. The disk image seems unnecessarily cumbersome.

RE: DIY Kernel: CirrusLogic's "Build the Code" Instructions Don't Work

cstanton — Wed, 04 Mar 2015 23:38:41 GMT

What errors are you experiencing ? (You don't state them).

It's entirely possible that the errors you're experiencing are down to missing dependencies for building the source code, often the error messages allude to what you need to do.

Once we've identified that then we can determine if Cirrus should change their instructions and how.