Pinmux Problems

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1

I'm trying to add some new pinmux modes to the universal overlay, but
something fundamental seems to be wrong. I'm using the RCN built
machinekit image with the 3.8.13-xenomai-r79 kernel. I started with
the existing dts
(/opt/source/beaglebone-universal-io/cape-universal-00A0.dts), gave it
a new name and compiled it. When I try to load it, however, I get
*TONS* of errors, pretty much all of them looking like this:

[ 2758.176552] bone-pinmux-helper P8_07_pinmux.14: could not find pctldev for node /ocp/interrupt-controller@48200000, deferring probe
[ 2758.176578] bone-pinmux-helper P8_07_pinmux.14: Failed to get pinctrl
[ 2758.183378] platform P8_07_pinmux.14: Driver bone-pinmux-helper requests probe deferral
[ 2758.183812] bone-pinmux-helper P8_08_pinmux.15: could not find pctldev for node /ocp/edma@49000000, deferring probe
[ 2758.183834] bone-pinmux-helper P8_08_pinmux.15: Failed to get pinctrl
[ 2758.190601] platform P8_08_pinmux.15: Driver bone-pinmux-helper requests probe deferral
[ 2758.190934] bone-pinmux-helper P8_09_pinmux.16: could not find pctldev for node /fixedregulator@0, deferring probe
[ 2758.190948] bone-pinmux-helper P8_09_pinmux.16: Failed to get pinctrl

...and most of the pinmux control files don't get created in sysfs.

If I just load the cape-universal overlay that's built-in to the
kernel, it works fine.

I'm pulling the 3.8.13-xenomai-r79 kernel source, but it's going to
take a while (my local kernel git repo is very stale). Are there some
recent changes that would cause "legacy" universal capes to suddenly
stop working properly?

2

Problem solved...it's not an issue with the overlay, it's the
device-tree-compiler.

The dtc version on recent images is 1.4.1, but the version used by the
3.8.13 kernel is 1.2.0-g37c0b6a0. If I use the dtc from the kernel
source I can happily load a freshly compiled overlay.

Robert:
Any idea exactly what's going on? Both versions report that they
generate version 17 dtb blobs by default, but something is obviously
different in the results.

Also, I didn't see a package for the older dtc available in the repos
(just 1.4.0 and 1.4.1). Is there a way to get 1.4.x to make a dtb the
3.8.13 kernel will like or a suggested way to install the appropriate
dtc on the Machinekit images when built? I just copied the dtc binary
from the 3.8.13 kernel tree, but that's probably not a desired
end-user experience. :slight_smile:

3

The dtc version on recent images is 1.4.1, but the version used by the
3.8.13 kernel is 1.2.0-g37c0b6a0. If I use the dtc from the kernel
source I can happily load a freshly compiled overlay.

It should be 1.4.0 for 3.8.x kernels. As I recall.

4

Yeah the dtc between 3.8.x and 4.1.x+ is not compabitle..

Run this script to get a 3.8.x compatible one in jessie:

wget https://raw.githubusercontent.com/RobertCNelson/tools/master/pkgs/dtc.sh
/bin/bash dtc.sh

Regards,

5

Thanks, I'll see if I can get that integrated into the image builds,
but it might take me a while.