I ended up with an ER-X-SFP with an Ubiquity Fiber Instant SFP GPON stick in my hands and I would like to check the support for the GPON stick. This post is mainly a call for help to understand technical information.
As of OpenWRT 22.0.3, it seems like it is not supported, as dmesg shows:
[ 19.440306] sfp sfp_eth5: Detected broken RTL8672/RTL9601C emulated EEPROM
[ 19.454024] sfp sfp_eth5: Switching to reading EEPROM to one byte at a time
[ 23.970313] sfp sfp_eth5: EEPROM base structure checksum failure: 0xe6 != 0xff
[ 23.984722] sfp EE: 00000000: 02 04 0b ff ff ff ff ff ff ff ff 03 0c 00 14 c8 ................
[ 24.002046] sfp EE: 00000010: 00 00 00 00 55 42 4e 54 20 20 20 20 20 20 20 20 ....UBNT
[ 24.019360] sfp EE: 00000020: 20 20 20 20 00 74 ac b9 55 46 2d 49 4e 53 54 41 .t..UF-INSTA
[ 24.036677] sfp EE: 00000030: 4e 54 20 20 20 20 20 20 34 20 20 20 05 1e 00 ff NT 4 ....
[ 24.053996] sfp EE: 00000040: 64 be 47 81 00 5d 01 81 c0 5c 01 81 80 9a 77 80 d.G..]...\....w.
[ 24.071320] sfp EE: 00000050: fe ff ff ff 80 c6 43 81 00 00 78 80 c0 5c 01 81 ......C...x..\..
On December 2019 a user of this forum wrote:
RTL8672 = Lexra architecture => unsupported
On december 30, 2020 a series of patches named net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber have been submitted to the kernel. I don't really understand the content of the patches, but the name and description look promising.
The patches have been merged on January 28, 2021 1 2 3 and included in the kernel since v5.12. They have been backported in OpenWRT on July 25, 2021 and are included in OpenWRT 22:
git tag --contains f032601ed7d70fe1f468219b68750230b6ea1906
v22.03.0
...
v22.03.3
- Should those patches bring support for the Ubiquity Fiber Instant stick, or is more work needed to achieve before this?.
- If so, why
dmesgis displaying an error message with OWRT 22.0.3, as it looks v22 includes the patches ?
Related links: Amine4000/RTL960x, zry98/SFP-GPON-ONU