Thanks for the follow up Denys,
It's difficult for me to derive optimal solutions here, as I am only
learning the Yocto environment. Eventually I would like to create a
"custom OS" that would just build all needed ecosystem for the end
device.
At this point I am trying to make a proof of concept approach in which I
(via device tree overlay) will be able to deinitialize the HDMI pins and
configure at least one pin as a PRU mapped (mode 5 or 6 if I recall
correctly).
I will try to make something out of your's and Jon's answers for that
end. Thank you again.
--
Łukasz Przeniosło
------ Original Message ------
From "Denys Dmytriyenko" <[email protected]>
To "Lukasz Przenioslo" <[email protected]>
Cc "Jon Cormier" <[email protected]>;
[email protected]
Date 2023-12-22 08:03:56
Subject Re: [meta-ti] Custom device tree overlay for BBB
Sorry, this got a bit out of context - one of the solutions from Jon was
talking about adding a bbappend to a kernel recipe, which would then
automatically handle KERNEL_DEVICETREE list via kernel-devicetree,bbclass
Alternatively, if you add a standalne recipe, all you need is to add your
overlay to SRC_URI and inherit devicetree.bbclass
On Fri, Dec 22, 2023 at 06:14:51AM +0100, Lukasz Przenioslo wrote:
Hi Denys,
Should be easy enough to test it quickly as a proof of concept,
thank you. Will bitbake know to compile this overlay, tell the
u-boot to load it and so on?
On December 22, 2023 02:49:39 Denys Dmytriyenko <[email protected]> wrote:
>You could simply add your overlay in one of the conf files, such as
>local.conf:
>
>KERNEL_DEVICETREE += "your-overlay.dtbo"
>
>Check the existing machine conf files for examples.
>
>
>On Thu, Dec 21, 2023 at 08:51:49PM +0000, Lukasz Przenioslo wrote:
>>Hi Jon,
>>I guess the first option is more feasible, as I would not like to
>>modify any files provided by the Poky repo, but rather create my own
>>recipe that would somehow cover the default settings during the
>>build. There is still a lot ahead for me to understand though...
>>
>>Thank you for the useful links.
>>
>>--
>>Łukasz Przeniosło
>>
>>
>>------ Original Message ------
>>From "Jon Cormier" <[email protected]>
>>To "Bremenpl" <[email protected]>
>>Cc [email protected]
>>Date 2023-12-21 16:17:38
>>Subject Re: [meta-ti] Custom device tree overlay for BBB
>>
>>>This solution seems like a good place to start. I haven't tried it
>>>myself but it looks clean and easy to implement.
>>>https://stackoverflow.com/a/68650774
>>>
>>>The alternative would be to bbappend the kernel and patch your
>>>overlay into the correct folder.
>>>https://stackoverflow.com/a/39343720
>>>
>>>On Thu, Dec 21, 2023 at 10:03 AM Bremenpl <[email protected]> wrote:
>>>>Hi and thank you for the answer Jonathan!
>>>>
>>>>Do you happen to also know a good reference on how to
>>>>incorporate an overlay into the yocto build?
>>>>
>>>>On December 21, 2023 15:58:56 Jon Cormier
>>>><[email protected]> wrote:
>>>>
>>>>>Here is a possible example overlay that configures pinmuxes
>>>>>with the expectation that the pru's will use them. There is
>>>>>likely a similar example in that long list of overlays that
>>>>>disables hdmi.
>>>>>
>>>>>https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/AM335X-PRU-RPROC-4-19-TI-PRUCAPE-00A0.dts
>>>>>
>>>>>Note its entirely possible these examples won't build or apply
>>>>>correctly on a different kernel version, but they should still
>>>>>be a decent starting point.
>>>>>
>>>>>On Thu, Dec 21, 2023 at 6:34 AM Lukasz Przenioslo
>>>>><[email protected]> wrote:
>>>>>>Hello there,
>>>>>>
>>>>>>I was able to compile the Poky image (Dunfell) with meta-ti
>>>>>>included for the BBB. I am working on an open source project
>>>>>>intended for home automation based on the BBB:
>>>>>>https://github.com/Beaglenode/BeagleNodeHW
>>>>>>
>>>>>>The next step I am trying to make is to prepare a proper
>>>>>>device tree overlay that would align with the HW
>>>>>>requirements of this project (or "cape"). I need to:
>>>>>>- Disable the HDMI pins,
>>>>>>- configure multiple pins as either PRU0 or PRU1 controlled.
>>>>>>
>>>>>>For that I thought the best approach would be to prepare a
>>>>>>DTO, instead of modifying the default one for BBB. I don't
>>>>>>know how to prepare that DTO yet and I don't know how to
>>>>>>include it in my build. I would like to ask for some help in
>>>>>>this manner, especially the prior part (how to load the
>>>>>>custom DTO). Right now I am still modifying everything in
>>>>>>the local.conf, as I do not have the knowledge yet to build
>>>>>>my own distro for this device (that's the end plan).
>>>>>>
>>>>>>I would appreciate all help!
>>>>>>
>>>>>>
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