UART Pintout for this model

[jjeziorny]

I locked myself out of an SFP which has the RTL chipset by missing a " in the lastgood.xml, so need to get UART access to it to try and recover it. Any ideas what pins should I use?

[Anime4000]

Hi,

You have same stick with me, unfortunately V2801F stick did not UART pinout.

Best effort to fix your issue is by reading and writing NAND Flash directly

[jjeziorny]

Thanks @Anime4000, Do you have a working one? Can you check if it creates a second interface/IP? Some of the other SFPs I have do create a second management interface on VLAN2, which can be used to access it in case of issues with the main admin IP

Like this one:

# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether ac:4a:fe:98:0a:f2 brd ff:ff:ff:ff:ff:ff
3: eth0.2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:00:00:01:00:02 brd ff:ff:ff:ff:ff:ff
4: nas0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:00:00:01:00:02 brd ff:ff:ff:ff:ff:ff
5: pon0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:00:00:01:00:02 brd ff:ff:ff:ff:ff:ff
6: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
    link/ether ac:4a:fe:98:0a:f2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.1/30 brd 192.168.2.3 scope global br0
7: nas0_0: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 10
    link/ether ac:4a:fe:98:0a:f5 brd ff:ff:ff:ff:ff:ff
9: br0.2@br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP 
    link/ether ac:4a:fe:98:0a:f2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.1/24 brd 192.168.10.255 scope global br0.2

Note the last entry:

9: br0.2@br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP 
    link/ether ac:4a:fe:98:0a:f2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.1/24 brd 192.168.10.255 scope global br0.2

Never played with writing NAND Flash, so might take a while to achieve that. I have also bought a SFPTotal Whistle to try and reprogram SFPs, but so far couldn't get it to read any of the SFPs I have

[Anime4000]

Do you have a working one? Can you check if it creates a second interface/IP? Some of the other SFPs I have do create a second management interface on VLAN2, which can be used to access it in case of issues with the main admin IP

most of GPON Stick have 192.168.1.1 for WebGUI/Managemen

If you want to access, simply add sfp @ 192.168.1.1 into NAT group.

I add sfp in WAN group on Mikrotik Router, from Mikrotik LAN 192.168.88.0/24 can access 192.168.1.1 of sfp

No need add VLAN or Bridge.

With this, you can increase sfp MTU to 1508 then PPPoE can use 1500 MTU in Mikrotik

[jjeziorny]

Yes I know, however whilst configuring a different IP on the SFP I missed a " in the lastgood.xml, now the SFP lost the IP and I can't access. Some SFPs have a secondary IP configured by default, on a VLAN or not, hence I was asking if you could boot your SFP and do an ip addr so see if it has any other IP configured.

[Anime4000]

Yes I know, however whilst configuring a different IP on the SFP I missed a " in the lastgood.xml, now the SFP lost the IP and I can't access. Some SFPs have a secondary IP configured by default, on a VLAN or not, hence I was asking if you could boot your SFP and do an ip addr so see if it has any other IP configured.

sorry, ip addr only show 192.168.1.1 on br0, no other ip address

you can reflash the firmware to fix missing file?

[jjeziorny]

I would love to, never done it. I guess I just a new thing to learn. Any tips on how to do it?

[Anime4000]

I haven't go that route yet, so, I not sure how to read and write NAND flash