Modifying kernel drivers for testing

davorin · July 21, 2016 at 12:16 PM

Hello

Is there an easy way to modify existing kernel drivers for debugging?

When I change them in the build directory the changes have no effect of course...but if I clean the kernel build it probably generates all source files again in the build directory?

thanks in advance
richard

**chewitt** · July 21, 2016 at 12:22 PM Official Post

The build system works by unpacking sources and patching them before compiling. You can make changes in the unpacked sources, but then you need to create a "diff -Naurp" patch of the changes and add that to the package. Any change to the package folder will trigger a clean rebuild of the package where the sources are nuked and re-unpacked. The patches need to follow packagename-version-sequence-name.patch format; look at the existing set of kernel patches for more info.

davorin · July 21, 2016 at 2:33 PM

Ah okay....

What is the order of the patches then?

In my case I need to patch the intel hdmi audio stuff back to the working version of openelec-8 build...since hdmi audio isn't working anymore in libreelec git build..

And since the hdmi intel audio driver itself is a patch...which patch would be first applied...the linux kernel patch or der package patch?

**gdachs** · July 21, 2016 at 2:40 PM

Quote from davorin

What is the order of the patches then?

Alphabetical order.

Gerald

**vpeter** · July 21, 2016 at 3:55 PM

Order in which patches are applied: LibreELEC.tv/unpack at master · LibreELEC/LibreELEC.tv · GitHub