BBAI-64 device tree overlays

LuisRivera · July 20, 2022, 7:35pm

Hello BB community!

I am playing around with my AI-64. I want to do some pinmuxing overlay and I have prepared a dts for this. I have previously worked with Beaglebone black and I usually add the dtbo to the uEnv.txt file and the overlay gets done. I have looked for something like this on AI-64 debian, but I could not find it. What is the procedure to add overlays for this board?

Thanks!
Luis

RobertCNelson · July 20, 2022, 7:56pm

The extlinux options for overlays is listed here:

the repo and branch is:

git clone -b v5.10.x-ti-arm64 https://github.com/beagleboard/BeagleBoard-DeviceTrees/
cd ./BeagleBoard-DeviceTrees/
make
sudo make install

There are 3 current overlays…

I’m working on mergeing these in…

github.com

jadonk/BeagleBoard-DeviceTrees/blob/ai64/src/arm64/k3-j721e-beagleboneai64.dts#L857-L874


      
          /* macro: BONE_PIN( <pin>, <mode_name>, <register_value_macro(s)> */
          #define BONE_PIN(XX,ZZ,QQ) \
          	XX##_##ZZ##_pin: pinmux_##XX##_##ZZ##_pin { pinctrl-single,pins = < QQ >; };
          
          	/* Full P8/P9 header mode definitions */
          	/* P8_01 - GND */
          	/* P8_02 - GND */
          	BONE_PIN(P8_03, default,   P8_03(PIN_INPUT, 7))
          	BONE_PIN(P8_03, pruout,    P8_03(INPUT_DISABLE, 0))
          	BONE_PIN(P8_03, pruin,     P8_03(PIN_INPUT, 1))
          	BONE_PIN(P8_03, can,       P8_03(INPUT_EN, 6))
          	BONE_PIN(P8_03, gpio,      P8_03(INPUT_EN, 7))
          	BONE_PIN(P8_03, gpio_pu,   P8_03(PIN_INPUT_PULLUP, 7))
          	BONE_PIN(P8_03, gpio_pd,   P8_03(PIN_INPUT_PULLDOWN, 7))
          
          	BONE_PIN(P8_04, default,   P8_04(PIN_INPUT, 7))
          	BONE_PIN(P8_04, pruout,    P8_04(INPUT_DISABLE, 0))
          	BONE_PIN(P8_04, pruin,     P8_04(PIN_INPUT, 1))

Right not mostly making it automated from ti’s json files… As hand edits become too complex!

Regards,

Jiyo_Palatti · October 13, 2022, 8:22pm

Hi @RobertCNelson ,
I am having a similar problem. I have custom CAN cape that has couple of CAN bus transceivers. This was used with a Beaglebone Black.
How do I get this working with BB AI64? How do I configure the pins and load the device tree overlays?

In beaglebone black I added these overlays
uboot_overlay_addr0=/lib/firmware/BB-CAN0-00A0.dtbo
uboot_overlay_addr1=/lib/firmware/BB-CAN1-00A0.dtbo

to the /boot/uEnv.txt.
Please let me know if I need to provide more information.