HPE 1920-48G (JG927A) (rtl839x) - SFPs not working

Installing and Using OpenWrt
1

I recently installed 24.10.0 on a JG927A.

The switch has 48 10/100/1000 LAN ports plus 4 SFP slots.
While I'm trying to get a connection via Fiber (1G SX SFP), I ended up with the following problems:
Only 2 of the 4 SFP slots detect a plugged SFP: sfp-p49 and sfp-p50.
May be a result of:

Tue Mar 11 18:55:30 2025 kern.info kernel: [   20.548335] platform sfp-p51: deferred probe pending
Tue Mar 11 18:55:30 2025 kern.info kernel: [   20.564912] platform sfp-p52: deferred probe pending

If a SFP is plugged in at port 49 or 50:
Wed Mar 12 12:39:04 2025 kern.info kernel: [63710.803977] sfp sfp-p49: module OEM SFP-SX-MM-F rev 1.0 sn EN32M041 dc 111028

I tried to set 1G FDX with ethtool
ethtool -s lan49 speed 1000 duplex full autoneg off
but there is no communtcation with the sfp (no Link detected, no packets at all).

The same setup is running fine with the HPE firmware.

Anyone else here running openwrt on a HPE 1920-48G and tried SFPs?

2

On these switches, only 2 out of the 4 SFP ports fully work when using OpenWrt. The reason is that the i2c clock signal is shared between the slots and this is not supported by the drivers in OpenWrt (there is an experimental driver that supports this, but it has not (yet?) landed in OpenWrt).

Reference:

3

Thanks for your quick reply.
This will answer one of my two questions.

SFPs at 49 and 50 does not communicate in any way...