On Fri, Mar 30, 2018 at 12:56 AM, Jaremy Creechley <[email protected]> wrote:
>
> I'm working on creating a variant of a Buildroot image using the
> 4.9.82-ti-rt kernel (taken from @RCN's stretch/ sources) and modified to use
> u-boot overlays. The buildroot image works well on the Beaglebone Green
> (with the PRU's loading much quicker than the 4.4.x branch I'd used
> previously using TI's recently modified `/sys/class/remoteproc/` scheme).
>
> The image also boots the PocketBeagle and loads `g_ether` and boots fine.
> However, it does not load the PRU units and only loads `remoteproc0` [the
> omap timer (?)]. There are no `/sys/class/remoteproc/` entries for either of
> the PRU units. The kernel logs don't show anything, no errors, or anything
> regard the PRU units (aside from remoteproc0).
>
> Based on the serial output from the BBG, the U-Boot version correctly boots
> using U-Boot 2018.03. Also, the u-boot based cape manager loads on both the
> BBG and PB boards after some tweaking with the uEnv.txt file. Still I have
> not been able to get remoteproc to load the PRU units.
>
> Does anyone have any suggestions? Do I need to load another cape? I've tried
> setting the 4-9 PRU dtbo in `uEnv.txt` to no avail.
>
> I've been reading through the DTS and DTSI sources in the Linux kernel as
> well as the bb.org-overlays. It seems that the linux in-tree dtsi files for
> the PocketBeagle don't mention the PRUSS hardware units at all. This is in
> contrast to the BBB and BBG which both set the `status` field to "ok" for
> both PRU units. My suspicion based on that is that the PRUSS and remoteproc
> configurations aren't updated for the PB. The bb.org overlay's also do not
> mention the PB at all that I've found. However, it appears that several
> people have the PRU's loading and working on the PB's. Hence my confusion!
Add this to your pocket beagle dts: (it's essentially what the overlay does..)
&pruss_soc_bus {
status = "okay";
pruss: pruss@4a300000 {
status = "okay";
pru0: pru@4a334000 {
status = "okay";
};
pru1: pru@4a338000 {
status = "okay";
};
};
};
Regards,
--
Robert Nelson
https://rcn-ee.com/
--
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