Need clarification on EEPROM on i2c1

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
1

Hi Team,

@WayneWWW

below snippet is from xavier nx dts (tegra194-p3509-0000-a00.dtsi),

eeprom-manager {
data-size = <0x100>;
bus@0 {
i2c-bus = <&gen1_i2c>;
eeprom@1 {
slave-address = <0x57>;
label = “cvb”;
};
};
bus@1 {
i2c-bus = <&gen2_i2c>;
eeprom@1 {
slave-address = <0x50>;
label = “super-module”;
};
};
};

with i2cdetect tool i could see EEPROM device(0x57) on i2c0. But i couldn’t able to see EEPROM device(0x50) on i2c1. Is EEPROM with slave address 0x50 is present on SoM or carrier board? Please provide your comments on this.

Thanks,
Arun

2

The i2c0 0x50 is the module eeprom and i2c0 0x57 is the carrier board eeprom.

3

@WayneWWW

Thank you for clarification, I am able see both 0x50 and 0x57 on i2c0. but is there any other EEPROM on i2c1(gen2_i2c) as defined in the above dts?

as per aliases defined in dts:
gen1_i2c is i2c0
gen2_i2c is i2c1

5

Hello,

That “super-module” is a NV internal board which also has a eeprom on it. Since you don’t have it, you can just ignore or overwrite this i2c.

1 Like
6

@WayneWWW

This is from Jetson nano dts(tegra210-porg-eeprom-manager.dtsi)
eeprom-manager {
data-size = <0x100>;
bus@0 {
i2c-bus = <&i2c1>;
word-address-1-byte-slave-addresses = <0x50>;
};
bus@1 {
i2c-bus = <&i2c3>;
word-address-1-byte-slave-addresses = <0x50 0x57>;
};
};

EEPROM with slave address 0x57(i2c3) is present on carrier board. Please let me know where the other 2 EEPROM are present(EEPROM with 0x50 on i2c1 and EEPROM with 0x50 on i2c3) are these present on SoM or carrier board?

7

This is jetson nx forum board. Please file your issue on nano board if you want to ask questions for nano.

9

Hi,
What is the purpose of the carrier board EEPROM? Can I custom it layout and store my own data? Thank you!

10

Please file a new topic and elaborate your issue.