How do I use device tree overlays on Fedora (since there is no "cape manager") ?
I assume I have to modify extlinux.conf to boot with a new device tree file. Is there a way to use "dtc" to merge the am335x-boneblack.dts file and the overlay file ?
FYI, the reason I ask this question is that I'm interested in CANbus. I noticed that Fedora has CANbus drivers now. Great. I have a BeagleBone Black (with Fedora 23 on a SD card) and a "Serial Cape" from LogicSupply : http://www.logicsupply.com/cbb-serial/ . There are device tree "overlay" files to enable this : https://github.com/lgxlogic/CBB-Serial/tree/master/overlay
How do I use device tree overlays on Fedora (since there is no "cape manager") ?
I assume I have to modify extlinux.conf to boot with a new device tree file. Is there a way to use "dtc" to merge the am335x-boneblack.dts file and the overlay file ?
FYI, the reason I ask this question is that I'm interested in CANbus. I noticed that Fedora has CANbus drivers now. Great. I have a BeagleBone Black (with Fedora 23 on a SD card) and a "Serial Cape" from LogicSupply : http://www.logicsupply.com/cbb-serial/ . There are device tree "overlay" files to enable this : https://github.com/lgxlogic/CBB-Serial/tree/master/overlay
Basically the Fedora support is about the equivalent as the upstream on this. A good overview of this currently was presented at ELC this week. The following slide deck [1] gives a good overview (starting from Page 21).
There were patches [2] for the BBone Cape Manager to go upstream but it's not landed and it appears to be stalled,
Like most things we try to follow upstream on this as it takes a lot of resources to maintain things out of tree. There's now patches for u-boot support (was referenced in the sldedeck as not being there) so we might be starting to have some movement. There is basic kernel support there in the kernel. I see the big blocker is actually having people agree on support for compiling them in the DT Compiler. There have been patches for that but never a consensus on what is the right way to do it.
[1] http://events.linuxfoundation.org/sites/events/files/slides/tenart-chip-over... [2] http://www.spinics.net/lists/devicetree/msg79541.html
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Ken Harris -
Peter Robinson