Help editing BBGW's device tree

[pok...@gmail.com]

Hello everyone, sorry if my question has been already answered - I have been looking around for a while and haven't found a good answer.

I am interested in adding some hardware to the Beaglebone Green Wireless board, but in order to do that I need to change some of the device tree/pin mux settings. I would like to eventually build a .img file with all of the beaglebone functionality including my additional hardware for easy SD card loading (as the currently provided images are capable of).

I have never built a Linux image myself, and though this page ( https://eewiki.net/display/linuxonarm/BeagleBone+Black ) is helpful, the formatting makes it confusing which commands correspond to which processes.

My understanding is that images can be built using seeed studio's image-builder branch: https://github.com/beagleboard/image-builder/tree/smaller-iot

I don't want to use overlays due to some low level interfaces moving (UARTx -> LAN, UARTy -> CAN, LDC ->UARTz etc)

Long story short: How can I build my own beaglebone green wireless image with a custom device tree? 

[Robert Nelson]

On Tue, Mar 7, 2017 at 6:11 PM, <pok...@gmail.com> wrote:
> Hello everyone, sorry if my question has been already answered - I have been
> looking around for a while and haven't found a good answer.
>
> I am interested in adding some hardware to the Beaglebone Green Wireless
> board, but in order to do that I need to change some of the device tree/pin
> mux settings. I would like to eventually build a .img file with all of the
> beaglebone functionality including my additional hardware for easy SD card
> loading (as the currently provided images are capable of).
>
> I have never built a Linux image myself, and though this page (
> https://eewiki.net/display/linuxonarm/BeagleBone+Black ) is helpful, the
> formatting makes it confusing which commands correspond to which processes.

Just follow it in order, top to bottom...

>
> My understanding is that images can be built using seeed studio's
> image-builder branch:
> https://github.com/beagleboard/image-builder/tree/smaller-iot
>
> I don't want to use overlays due to some low level interfaces moving (UARTx
> -> LAN, UARTy -> CAN, LDC ->UARTz etc)

dtb-rebuilder:

edit the bbgw dts and add ^ those..

https://github.com/RobertCNelson/dtb-rebuilder

>
> Long story short: How can I build my own beaglebone green wireless image
> with a custom device tree?

Regards,

--
Robert Nelson
https://rcn-ee.com/

[roberts...@yahoo.com]

--------------------------------------------
On Wed, 3/8/17, Robert Nelson <robert...@gmail.com> wrote:

Subject: Re: [beagleboard] Help editing BBGW's device tree
To: "Beagle Board" <beagl...@googlegroups.com>
Date: Wednesday, March 8, 2017, 2:49 AM

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[Ethan Heilicher]

Robert,

Thanks for the info - I have been following the steps in the BeagleBone+Black wiki page but encountered problems trying to write to my SD card (Setup microSD card step) as a result of my workstation (Ubuntu in a virtualbox vm on windows 8 on a macbookpro, ended up breaking my vm). In the end I want to have a beaglebone .img file to distribute to many systems, so following your steps to achieve that sounds to me like this:

1. Build beaglebone image by following https://eewiki.net/display/linuxonarm/BeagleBone+Black

        Completing this yields an SD card with a complete Linux image loaded.

2. Boot OS from the SD card, install dtb-rebuilder and edit dts files, run dtb-rebuilder and reboot

        After this we have the working OS I wish to distribute

3. Use a utility to rip the SD card image for distribution

Is this a correct process for retrieving the .img file I want? Is there a better way to build a .img than ripping it from the SD card? I tried to use image-builder but there is no way to edit the dts during the build (that I could figure out)

Thank you so much for your help!

- Ethan