I have the strange problem that after updating the Jetson Nano dev kit b002 SPI stops working. My test procedure: I flash a fresh OS with Jetpack 4.6.2 on to the Jetson (with or without SDK dos not matter). Enable the SPI pins via JetsonIO.py Reboot Load driver in the kernel with: sudo modprobe …

You could also use JP4.6.2 with the steps in that thread to verify SPI loopback test. Using the latest release is just making the status to be synchronized with us.

Hi Benutzer2517, Are you using the devkit or custom board for Jetson Nano? [image] Benutzer2517: run sudo apt update and sudo apt upgrade It seems you should refer to the following instruction to update your board. NVIDIA Jetson Linux Developer Guide : Over-the-Air Update | NVIDIA Docs …

[image] KevinFFF: Are you using the devkit or custom board for Jetson Nano? I use the devkit. [image] KevinFFF: It seems you should refer to the following instruction to update your board. NVIDIA Jetson Linux Developer Guide : Over-the-Air Update | NVIDIA Docs It is described that up…

[image] Benutzer2517: I checked via JetsonIO.py. Is there another way to check? Please share the result of the following command. $sudo cat /sys/kernel/debug/tegra_pinctrl_reg | grep -i spi

The output looks on both versions (4.6.2 and 4.6.3) identical. In version 4.6.2 the SPI works in 4.6.3 not. Bank: 1 Reg: 0x70003050 Val: 0x0000e044 -> spi1_mosi_pc0 Bank: 1 Reg: 0x70003054 Val: 0x0000e044 -> spi1_miso_pc1 Bank: 1 Reg: 0x70003058 Val: 0x0000e044 -> spi1_sck_pc2 Bank: 1 Reg: 0x70003…

Sadly, I have no time to test this in the near future. Because it does run with Version 4.62, I will stick with this version. I still do not understand why it does not work out of the box, if I flash the newer version to the Jetson from the SDK Manager.

SPI stops working after sudo apt upgrade on a Jetson Nano

Robotics & Edge Computing Jetson Systems Jetson Nano

KevinFFF June 6, 2023, 7:03am 7

It seems the pinmux register value wrong for SPI usage.
Could you refer to the following thread to verify SPI loopback test step-by-step?
Jetson Nano SPI Bus Not Working - #10 by KevinFFF

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SPI stops working after sudo apt upgrade on a Jetson Nano

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