MCP251X connection/setup

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

I recently started trying to setup a Jetson 2GB Jetson Nano Developer Kit, and trying to communicate it with a MCP251x module. So far I’ve tried different guides from both in this and outside this forum.

Following the steps in this guide, I don’t get any errors, the main problem I do get is that when I try to configure the 40 pin headers for compatible Hardware, the MCP251x is not there, even if my dtbo is in /boot/.

As for the other guide I have 2 main problems/questions.
When you get to step 3 and you have to paste the dts file to
/hardware/nvidia/platform/t210/tegra/common/kernel-dts/overlays.
I found out that the folder doesn’t exist in the kernel_src.tbz2 file, rather, to get to the kernel-dts/overlays you have to go to this address instead /hardware/nvidia/platform/tegra/common/kernel-dts/overlays
Is there a problem if the address is not the same? Given that they should be since they were both downloaded from the same site.

Secondly, whenever I get to step 4 Build Device Tree overlay, and I have to use the “make ARCH=arm64 dtbs” command, I get this error:

ERROR (duplicate_label): Duplicate label ‘jetson_io_pinmux’ on /fragment@3/overlay/header-40pin-pinmux and /fragment@2/overlay/exp-header-pinmux
ERROR: Input tree has errors, aborting (use -f to force output)
arch/arm64/boot/dts/Makefile:133: recipe for target ‘arch/arm64/boot/dts/ddot/ddot/ddot/ddot/ddot/ddot/hardware/nvidia/platform/t210/porg/kernel-dts/tegra210-p3448-0000-p3449-0000-a01-mcp251x.dtbo’ failed
make[1]: *** [arch/arm64/boot/dts/ddot/ddot/ddot/ddot/ddot/ddot/hardware/nvidia/platform/t210/porg/kernel-dts/tegra210-p3448-0000-p3449-0000-a01-mcp251x.dtbo] Error 2
arch/arm64/Makefile:154: recipe for target ‘dtbs’ failed
make: *** [dtbs] Error 2

Are there any ideas as to how I can get to setup the 40 pin header for the Jetson? aswell as any tips that might be useful as I work through CAN communication?

P.S. The only other thing I’ve done was remove the following 2 overlays from the /boot/ file, as they’re known to cause issues when running the jetsion-io
tegra210-p3448-0000-p3449-0000-a01-mcp251x.dtbo
tegra210-p3448-0000-p3449-0000-a02-mcp251x.dtbo

3

hello Skairry,

may I know which JetPack release you’re using?
you should see dts file for MCP251x CAN Controller, please do update the Jetson Device-tree overlay here.
i.e. $public_sources/Linux_for_Tegra/source/public/hardware/nvidia/platform/tegra/common/kernel-dts/overlays/jetson-mcp251x.dts

4

I’m using the 4.6.1-b110 Jetpack Version.
As for the updated overlay address, I’m working on the address you gave, but I still get the duplicate label error

5

hello Skairry,

please check your steps, you should confirm you’re using clean kernel sources.
please also refer to Building the NVIDIA Kernel for the steps to build the NVIDIA kernel.

6

Hi, I’m getting the same ‘duplicate label’ error. Have you managed to figure it out yet? Thanks.

Tested with:

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