---
name: "eeprog"
section: "8"
platform: "linux"
package: "i2c-tools"
version: "4.4-4"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/eeprog"
---

# eeprog(8)

reads and writes 24Cxx EEPROMs connected to I2C serial bus

## NAME

eeprog - reads and writes 24Cxx EEPROMs connected to I2C serial bus

## SYNOPSIS

**eeprog** \[-fqxdh\] \[-16\|-8\] \[-r addr\[:count\]\|-w addr\] \<device\> \<i2c-addr\>

## DESCRIPTION

**eeprog** uses the SMBus protocol used by most of the recent chipsets.

## NOTE

Don't forget to load your i2c chipset and the i2c-dev drivers.

The following environment variables could be set instead of the command line arguments:

    EEPROG\_DEV              device\
\
     EEPROG\_I2C\_ADDR         i2c-addr

## PARAMETERS

*Address modes*

- **-8**

  Use 8bit address mode for 24c0x...24C16 \[default\]

- **-16**

  Use 16bit address mode for 24c32...24C256

- *Actions*

  - **-r addr\[:count\]**

  Read **count** (1 if omitted) bytes from **addr** and print them to the standard output

- **-w addr**

  Write input (stdin) at address **addr** of the EEPROM

- **-h**

  Print this help

- *Options*

  - **-x**

  Set hex output mode

- **-d**

  Dummy mode, display what \*would\* have been done

- **-f**

  Disable warnings and don't ask confirmation

- **-q**

  Quiet mode

- *Bus*

  - **device**

  Device file representing the I2C bus (eg. /dev/i2c-0)

- **i2c-addr**

  I2C bus address of the EEPROM (eg. 0x3A)

## EXAMPLES

Read 64 bytes from the EEPROM at address 0x54 on bus 0 starting at address 123 (decimal)

**eeprog** /dev/i2c-0 0x54 -r 123:64

Print the hex codes of the first 32 bytes read from bus 1 at address 0x22

**eeprog** /dev/i2c-1 0x51 -x -r 0x22:0x20

Write the current timestamp at address 0x200 of the EEPROM on bus 0 at address 0x33

 	date \| **eeprog** -f /dev/i2c-0 0x33 -w 0x200

## AUTHOR

Stefano Barbato