4.30. I see I2C write errors in kernel messages after driver installation

After installing the camera drivers, you may encounter error messages related to “i2c write failed” or “Ser device not found” in the kernel messages (which can be viewed with dmesg or in /var/log/syslog).

Example error message:

Jun 29 17:13:53 jetson-desktop kernel: [   11.114217] tier4_max9295 30-0062: [tier4_max9295_write_reg] : Max9295 I2C write failed.    Reg Address = 0x0000  Data= 0xC0.
Jun 29 17:13:53 jetson-desktop kernel: [   11.115551] tier4_max9295 30-0060: [tier4_max9295_write_reg] : Max9295 I2C write failed.    Reg Address = 0x0010  Data= 0x22.
Jun 29 17:13:53 jetson-desktop kernel: [   11.116391] tier4_max9295 30-0060: [tier4_max9295_setup_control]: Ser device not found
Jun 29 17:13:53 jetson-desktop kernel: [   11.116617] tier4_isx021 30-001c: [tier4_isx021_gmsl_serdes_setup] : Failed to setup GMSL serializer.
Jun 29 17:13:53 jetson-desktop kernel: [   11.116873] tier4_isx021 30-001c: [tier4_isx021_probe] : Failed GMSL Serdes setup.
Jun 29 17:13:53 jetson-desktop kernel: [   11.117134] tier4_isx021: probe of 30-001c failed with error -121

These errors are typically related to GMSL ports where no cameras are physically connected. The driver attempts to probe all possible ports defined in the device tree, and these messages indicate that it failed to communicate with a camera on an empty port.

You can safely ignore these messages as long as the cameras you have connected are detected and functioning correctly.