Yes, this is the U-Boot environment of the embedded Lantiq Falcon system running on the ONT stick.
well, I don’t understand these controls, so I prefer not to touch them at the risk of bricking the ONT.
If you can login to the ONT somehow via SSH or Telnet and use fw_setenv asc0 1 only without seeting or modifying preboot. If you are afraid to break things, dump the env first with fw_printenv and lets discuss here.
looks like it fixed the problem as i can’t see any errors now
root@OpenWrt:/# logread | grep 'sfp'
Sat Aug 19 14:01:10 2023 kern.info kernel: [ 11.683303] sfp sfp-1: Host maximum power 1.0W
Sat Aug 19 14:01:10 2023 kern.info kernel: [ 11.688496] sfp sfp-2: Host maximum power 1.0W
Sat Aug 19 14:01:10 2023 kern.info kernel: [ 12.019752] sfp sfp-1: module ALCATELLUCENT G010SP rev 10 sn ALCLFAB44018 dc 161205
Sat Aug 19 14:01:10 2023 kern.info kernel: [ 12.059671] sfp sfp-2: module TP-LINK TL-SM410U rev 2.0 sn 122C304001372 dc 221228
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.273990] mt7530-mdio mdio-bus:1f sfp2: configuring for inband/2500base-x link mode
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.283870] br-lan: port 5(sfp2) entered blocking state
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.289098] br-lan: port 5(sfp2) entered disabled state
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.296781] device sfp2 entered promiscuous mode
root@OpenWrt:/#
root@OpenWrt:/# logread | grep 'eth1'
Sat Aug 19 14:01:10 2023 kern.info kernel: [ 1.181362] mtk_soc_eth 15100000.ethernet eth1: mediatek frame engine at 0xffffffc009780000, irq 136
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.305501] mtk_soc_eth 15100000.ethernet eth1: configuring for inband/2500base-x link mode
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.315595] br-wan: port 1(eth1) entered blocking state
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.320850] br-wan: port 1(eth1) entered disabled state
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.326233] device eth1 entered promiscuous mode
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.332371] br-wan: port 1(eth1) entered blocking state
Sat Aug 19 14:01:13 2023 kern.info kernel: [ 19.337600] br-wan: port 1(eth1) entered forwarding state
Sat Aug 19 14:01:14 2023 kern.info kernel: [ 20.151135] br-wan: port 1(eth1) entered disabled state
root@OpenWrt:/#
But it keeps going into disabled state so i still can’t acces the onu on it’s ip address at 192.168.20.10
OMG ! i can’t access my ONT anymore with ssh with debian now…
root@bpi-r3:/# ping 192.168.20.10
PING 192.168.20.10 (192.168.20.10) 56(84) bytes of data.
64 bytes from 192.168.20.10: icmp_seq=1 ttl=64 time=0.306 ms
64 bytes from 192.168.20.10: icmp_seq=2 ttl=64 time=0.273 ms
64 bytes from 192.168.20.10: icmp_seq=3 ttl=64 time=0.318 ms
64 bytes from 192.168.20.10: icmp_seq=4 ttl=64 time=0.262 ms
root@bpi-r3:/# ssh [email protected]
ssh: connect to host 162.168.20.10 port 22: No route to host
root@bpi-r3:/#
i can’t revert to fw_setenv asc0 0 
EDIT: Fortunately i could revert the setting using a mediaconverter (TP-LINK MC220L) But i’m still getting that route error…I must have a configuration problem somewhere
You have a typo in ip address 
THANKS !!!
some of you having a snapshot working with your ONT SFP, please share a link so we can test it with our equipment ! Thanks a lot !
i don’t have any issues too, with a tplink 2.5g sfp to rj45. Looks like the poblem occures only with ONT SFP…
Then I am curious why it does not work on openwrt, but it does on debian.
I did not understand that part from the above…
and now my BPI-R3 doesn’t want to boot from sdcard anymore ?!
all jumpers are high, and i keep getting this message
Using ethernet@15100000 device
TFTP from server 192.168.1.254; our IP address is 192.168.1.1
Filename 'openwrt-mediatek-filogic-bananapi_bpi-r3-initramfs-recovery.itb'.
Load address: 0x46000000
Loading: *
ARP Retry count exceeded; starting again
Wrong Image Format for bootm command
ERROR: can't get kernel image!
* spi-nand0
- device: spi_nand@1
- parent: spi@1100a000
- driver: spi_nand
- type: NAND flash
- block size: 0x20000 bytes
- page size: 0x800 bytes
- OOB size: 64 bytes
- OOB available: 24 bytes
- 0x000000000000-0x000008000000 : "spi-nand0"
- 0x000000000000-0x000000080000 : "bl2"
- 0x000000080000-0x000000380000 : "factory"
- 0x000000380000-0x000000580000 : "fip"
- 0x000000580000-0x000008000000 : "ubi"
Using ethernet@15100000 device
TFTP from server 192.168.1.254; our IP address is 192.168.1.1
Filename 'openwrt-mediatek-filogic-bananapi_bpi-r3-initramfs-recovery.itb'.
Load address: 0x46000000
Loading: *i’ll try to help you, hold on i’m building a test firmware for you (it includes lots of stuff you probably don’t want, just check if your sfp module works)
thanks but now what ever i burn on my sdcard, nothing boot. looks like the sdcard is not detected, or it try to boot from nand ??
https://easyupload.io/x80su7 try this, i’ve created a patch for your module, let me know if that helps
finaly it worked with another sdcard…
unfortunately
i still can’t ping the ont
i created my ont interface, added it the ip address 192.168.20.1/24 and added it in the firewall wan zone. everything is correctly configured, but it still doesn’t want to respond to the ping.
the problem = i can’t ping the ont, so no ssh, it just doesn’t work.
The ont is working, i can access it if i put it in a media converter (MC220L) and connect it to the wan port. that way i can access to its ip, and of course i can access internet.
now I wonder if I’m waiting long enough for the sfp to boot… 
since, i made this from the ONT : fw_setenv asc0 1
if i remember well, this wasn’t necessary with Debian. And with openwrt, if it fixes the error message, it doesn’t fix the problem anyway.
a ping/access normally need 2 ip adresses in same subnet (if not completely locally)…
please share your ip configuration (ip a)…if your ONT has 192.168.20.10 as ip address imho you need another one e.g. on a dummy bridge
with openwrt i just need to create a new interface on eth1, give it the ip address 192.168.20.1, and add it in the firewall wan zone. that’s enough, and that 100% works if i do it with the wan(rj45) port. my ONT is on ip 192.168.20.10
i can’t do ‘ip a’ actually i’m in my office, i’ll be back home later
I
I see you can edit the eeprom vendor and model ID.
static void sfp_fixup_halny_gsfp(struct sfp *sfp)
{
/* Ignore the TX_FAULT and LOS signals on this module.
* these are possibly used for other purposes on this
* module, e.g. a serial port.
*/
sfp->state_hw_mask &= ~(SFP_F_TX_FAULT | SFP_F_LOS);
}
...
...
SFP_QUIRK_F("HALNy", "HL-GSFP", sfp_fixup_halny_gsfp),
So perhapse you can edit
Setting SFP vendor name
fw_setenv sfp_vendor_name "YOUR_SFP_VENDOR_NAME"
Setting SFP part name
fw_setenv sfp_part_name "YOUR_SFP_PART_NAME"
And pretend it is the HALNy HL-GSFP module, so the quirk is activated.
Then assuming it shows the correct speed (2.5Gbps) also in the eeprom, then you should be pretty close to a solution.
Edit:
But it depends which kernel version is running, as this quirk is introduced in kernel 6.1…