Hi all, I have a Jetson Xavier NX here, which needs to interact with some sensors, some of which are using the SPI port 1 and some the ic2 1 interface (strangely labeled i2c 2 in jetson-io, pins 27 and 28). I know that my wiring is fine because both work perfectly fine independently, but when I en…

You need below context for spidev driver. spi@3210000 { compatible = "nvidia,tegra186-spi"; reg = <0x0 0x3210000 0x0 0x10000>; interrupts = <0x0 0x24 0x4>; #address-cells = <0x1>; #size-cells = <0x0>; iommus = <0x2 0x20>; dma-coherent; dmas = <0x19 0xf 0x19 0xf>; dma-names = "rx"…

No I haven’t. Could you provide some explanations of how I could do that? Can I find the original file available for download somewhere? Or should I flash the original OS again and make a copy of this file? Where is the dtb file located on the Xavier? Thanks!

You can get it by Host that install the sdkmanager and check the UI to get the path to get original dtb at …/Linux_for_Tegra/rootfs/boot/

Hi! I’m not sure I really understand your last message. I have flashed the “original” OS image downloaded from the Nvidia website with the intent to check if I can get both i2c and SPI to work again at the same time. For now I have not yet enabled anything, just flashed the OS and booted the Xavie…

To add again more information: I have now enabled SPI1 with jetson-io.py and rebooted to apply the changes. After the reboot, my i2c device is still detected and working fine (that’s good) but the SPI still doesn’t work for some reason, despite being enabled (I checked again with jetson-io): [AIB…

You may need below command to enable the spidev driver sudo modeprobe spidev

Yes, this did the trick! So I now have my Xavier NX Dev Kit with the original OS with both my i2c and SPI working. Which config files or dtb files should I then copy over to my hardened OS to get the same configuration? Thanks!

Your current dtb should be generate by jetson-io. check the /boot/extlinux/extlinux.conf

This is the content of the file: [AIBOX9] Do I understand correctly that I should copy the file /boot/kernel_tegra194-p3668-all-p3509-0000-user-custom.dtb onto my hardened OS and edit this line in the /boot/extlinux/extlinux.conf of my hardened OS to point to the file? Thanks!

Don’t know what’s hardened OS. If it’s another device then yes you can apply this dtb by that.

As explained in my very first message, I have to use a hardened Operating System for this application. This means that I used the default OS downloaded from the Nvidia website, and I then hardened it following the CIS-CAT guidelines for Ubuntu server level 1. This involves changing permissions, re…

SPI disabling i2c and vice-versa on Developer Kit

Robotics & Edge Computing Jetson Systems Jetson Xavier NX

ShaneCCC October 19, 2021, 5:31pm 21

Sorry I thought it’s Nano need to confirm the GPIO configure.
For NX doesn’t need to care about this.
Maybe you can check the PINMUX REG by devmem2.

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SPI disabling i2c and vice-versa on Developer Kit

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