====== SFP GPON ONU EEPROM Editing ======

===== Add 2500Base-X =====

Credit: https://github.com/Anime4000/RTL960x/discussions/250#discussion-6288339

==== Prerequisites ====

  * OpenWrt router with:
    * SFP port(s) (any speed) with I2C bus
    * Packages ''ethtool-full'' ''i2c-tools''
  * [[https://sfptotal.io/software|SFPTotal Wizard]] (Windows software, only used to calculate checksum at 0x3f)

==== Steps ====

  - On OpenWrt
    - Dump EEPROM:\\ ''ethtool -m //**[ethX]**// raw on > /tmp/sfp.bin''
  - On Windows desktop
    - Copy EEPROM to Windows desktop (run in Windows Terminal):\\ ''scp -O root@192.168.1.1:/tmp/sfp.bin .''
    - Open sfp.bin in SFPTotal Wizard
    - Set the bits in SFPTotal Wizard according to the EEPROM Bits table below
    - Take note of the checksum in 0x3F (first green byte)
  - On OpenWrt
    - Set the SFP EEPROM bits in OpenWrt according to the EEPROM Bits table below
      * ''i2cset -y 5 0x50 0x06 0x00''
      * ''i2cset -y 5 0x50 0x0a 0x05''
      * ''i2cset -y 5 0x50 0x0c 0x1f''
      * ''i2cset -y 5 0x50 0x3f 0x//**[Refer to SFPTotal Wizard]**//''
    - Physically re-seat the SFP
    - Verify the new speeds are detected:\\ ''ethtool -m //**[ethX]**//''\\ <code>
        Supported link modes:   2500baseX/Full
                                1000baseX/Full
</code>

==== EEPROM Bits ====

^ Address ^ Old Setting ^ New Setting ^
| ''0x06'' | ''0x02'' | ''0x00'' |
| ''0x0A'' | ''0x00'' | ''0x05'' |
| ''0x0C'' | ''0x0D'' | ''0x1F'' |
| ''0x3F'' (Checksum) | :!: Use SFPTotal to calculate! :!: ||