CAN problem on custom TX2-4GB board

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi,

On my custom tx2-4gb board, I used the command to enable can0 & can1 like tx2:

#! /bin/bash

sudo modprobe can
sudo modprobe can-raw
sudo modprobe mttcan

sudo ip link set can0 type can bitrate 500000 #loopback on
sudo ip link set up can0
sudo ip link set can1 type can bitrate 500000 #loopback on
sudo ip link set up can1

But as the result:

Cannot find device "can0"
Cannot find device "can0"
Cannot find device "can1"
Cannot find device "can1"

Does the can ports of tx2-4gb need to be enabled like Xavier https://devtalk.nvidia.com/default/topic/1042493/jetson-agx-xavier/enable-can-on-xavier?

Any ideas？Thanks in advance!
2

Hi,

Can you increase kernel loglevel and then try above commands? I need outputs when you use modprobe.
$dmesg -n 7 # To increase loglevel
You do not need to enable it like Xavier but still please provide values in registers:
0x0c303008
0x0c303010
0x0c303018
0x0c303020

Also please give the output of following node:
cat /proc/device-tree/mttcan@c310000/status
cat /proc/device-tree/mttcan@c320000/status

Thanks,
Shubhi

3

Hi, Shubhi

Thank you!

I've found my mistake that caused the problem of can_ports: I had just changed "CONFIG_CAN=m" to "CONFIG_CAN=m", then I thought the can driver would be static installed. However, It didn't work even if I used mobprobe again.
When I returned to the configuration before modification, the can_prots could be set up by mobprobe.
4

Hi,

Good to hear that problem is solved.

Regards,
Shubhi

5

My Xavier board is not recognizing the CAN1 port. (CAN0 works fine).

I am getting the following outputs to the command:

sudo ip link set up can1
Cannot find device “can1”

Following the suggestion above, I get:

cat /proc/device-tree/mttcan@c310000/status

okay
cat /proc/device-tree/mttcan@c320000/status
disabled

Do you have any suggestions of how to enable CAN1, please?

6

Hi camasmie,
You need to update status in mttcan@c320000 node of kernel device-tree present in BSP.
Use dtc command to modify and compile device tree.
Flash device with updated dtb.
Let me know if you face any issues.

Thanks,
Shubhi

7

Hi Shubhi, Thanks for the initial information.

Would you please, give me some more details, as follows:

  • where is the device-tree file located?
  • what is the proper way to recompile it with dtc?
  • what is the right procedure to flash the device?

By the way, I am using an Xavier board.

Thank you!

8

Hi poincare23,

Please refer to Welcome — Jetson Linux<br/>Developer Guide 34.1 documentation

9

Ok, thanks