Differentiating boards

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin Nano
1

I’m trying to programmatically identify a Jetson Nano vs a Jetson Orin Nano. My understanding is I can do that using the part number in the eeprom.

I’m trying to first figure out how to read the eeprom. From other posts, I’ve seen suggestions to use:

sudo i2cdump -y 7 0x50

However, when I do, the eeprom data looks empty as I just get a bunch of "X"s.

$ sudo i2cdump -y 7 0x50

[sudo] password for culinairy:
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
40: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
50: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
60: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
80: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
90: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
a0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
b0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
c0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
d0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
e0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
f0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX

Two questions:

  1. Am I correct that the part number in eeprom is the right way to differentiate the boards?
  2. How do I correctly read the eeprom data?
2

Actually, the i2c bus number of each Jetson series platform eeprom could be different.

It may not always be “7” there.

For example, try -y 0 0x50 on your board.

3

Tried that, but it didn’t work either:

$ sudo i2cdump -y 0 0x50
No size specified (using byte-data access)
Error: Could not set address to 0x50: Device or resource busy

4

Is your board flashed with jetpack6? If so, try to add -f parameter in i2cdump.

But actually it could be pointless thing because a Jetson nano is not able to boot up with Jetpack6.

If you only want to compare “Jetson Nano” and “Orin Nano”, then just checking the dmesg is sufficient.

6

It’s likely we’ll have to support others, so I was hoping for something more portable than grepping dmesg.

Running with -f gave me some output. How would I interpret this for differentiating the boards?

7

Here is the eeprom layout doc. byte20-49.

https://docs.nvidia.com/jetson/archives/r35.5.0/DeveloperGuide/HR/JetsonEepromLayout.html?highlight=eeprom

3448 is Jetson Nano

and 3767 is Orin Nano.

8

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