Section 8 · System administration

eeprog.8

Package: i2c-tools

eeprog

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

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

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

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

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)

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 /dev/i2c-0 0x33 -w 0x200

Stefano Barbato