About the startup behavior of the Jetson baseboard

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin Nano
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About the startup behavior of the Jetson baseboard

I have a question about the startup behavior of my homemade Jetson Orin nano/NX baseboard.
I can’t start up the homemade board with the Jetson Orin nano attached.
When I look at the output of the debug port, the following message appears, and I keep restarting it.

…
W> Skip ratchet update - OPTIN fuse not set
I> Task: Prepare eeprom data (0x50018ac4)
E> I2C: slave not found in slaves.
E> I2C: Could not write 0 bytes to slave: 0x00ae with repeat start true.
E> I2C_DEV: Failed to send register address 0x00000000.
E> I2C_DEV: Could not read 256 registers of size 1 from slave 0xae at 0x00000000 via instance 0.
E> eeprom: Failed to read I2C slave device
C> Task 0x0 failed (err: 0x1f1e050d)
E> Top caller module: I2C_DEV, error module: I2C, reason: 0x0d, aux_info: 0x05
I> Busy Spin
Now repeat the reboot

The following is stated on page 27 of “Jetson Orin NX Series and Jetson Orin Nano Series Product Design Guide(DG-10931-001_v1.2).pdf”.

4.5 Features Not to Be Implemented
The reference design features that should not be copied as they are not required or useful for a custom carrier board design. The ID EEPROM (U17) is a feature that is used for NVIDIA internal purposes, but not recommended on a custom design. If a similar functionality is desired for a custom design, avoid using address 7’h57 on the I2C2 interface.

After reading this, I copied the circuit of “Carrier board config” on page 24 of “P3768_A04_OrCAD_schematics(base_version).pdf” and changed the address from 7’h57 to 7’h56 to add an EEPROM to my board.

Here are some questions:

  1. What is the Jetson module trying to do with the EEPROM in the debug port log?

  2. The debug port log says “slave: 0x00ae with …”, but does this EEPROM refer to the EEPROM on my board? Or is there another EEPROM inside the Jetson module?

  3. My board also has the M.2 KEY-M (NVME) [A] (1x X4PCIe) on page 21 of “P3768_A04_OrCAD_schematics(base_version).pdf”. I2C2_SCL and I2C2_SDA are directly connected to P42 (SMB_DATA) and p40 (SMB_CLK) of this PCIE (NVMe), and are connected in parallel with the EEPROM. Is this ok?

Thank you in advance.

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Hi nakagoshi,

What’s the Jetpack version in use?

If you don’t have EEPROM on your custom carrier board, please refer to the instruction in EEPROM Modifications before flash the board.

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I am using Jetpack 5.1.3.
I will check the EEPROM Modifications.
Thank you in advance.

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For Jetpack 5.1.3(r35.5.0), please refer to EEPROM Modifications.
It should be the similar modification as the previous link.

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