BusyBox version 1.26.2

I am trying to use the ethernet expansion port and configure the Omega 2 as a DHCP client, not an ethernet to WiFi bridge.

I have checked/verified my ethernet cable is good and the router is working, lots of other devices hooked up here via hardwired ethernet.

I have changed the config at etc/config/network to look like this.

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fd1d:48c4:7633::/48'

#config interface 'wlan'
#        option type 'bridge'
#        option ifname 'eth0.1'
#        option proto 'static'
#        option ipaddr '192.168.3.1'
#        option netmask '255.255.255.0'
#        option ip6assign '60'

config interface 'wan'
        option ifname 'eth0'
        option proto 'dhcp'
	option hostname 'K200Omega'
# was eth0.2

config interface 'wwan'
        option ifname 'apcli0'
        option proto 'dhcp'

Per the docs here.
https://wiki.onion.io/Tutorials/Expansions/Using-the-Ethernet-Expansion

When the Omega 2+ Powers on I see the link LED on the router for that port blink a few times, but then stops.

The Omega 2 never gets and IP address.

Ifconfig looks like this.

apcli0    Link encap:Ethernet  HWaddr 42:A3:6B:00:38:E5  
          inet addr:192.168.0.35  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::40a3:6bff:fe00:38e5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:12967 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7923 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:5178879 (4.9 MiB)  TX bytes:641716 (626.6 KiB)

eth0      Link encap:Ethernet  HWaddr 40:A3:6B:C0:38:E7  
          inet6 addr: fe80::42a3:6bff:fec0:38e7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:272 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:88078 (86.0 KiB)
          Interrupt:5 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:180 errors:0 dropped:0 overruns:0 frame:0
          TX packets:180 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:12674 (12.3 KiB)  TX bytes:12674 (12.3 KiB)

ra0       Link encap:Ethernet  HWaddr 40:A3:6B:C0:38:E5  
          inet6 addr: fe80::42a3:6bff:fec0:38e5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:6 

Any ideas what I might be doing wrong?

Update, I performed a factory reset on my Omega2+ since it comes pre-configured as an ethernet to WiFi bridge.

Went through the Omega setup, connecting it to Wi-Fi via the Web configuration.

Verified Wi-Fi connection is working correctly.

Then I plugged my desktop computer ethernet into the Omega2+ Ethernet port, but the Omega2 did not issue an IP address to the desktop

When I plug the Ethernet cable into the router an IP address is correctly issued to the desktop so the desktop and Ethernet cable are fine.

I also checked the voltage at Pin 25 of the Omega, (3.3Vout). It's 0V. My understanding is that Vout is turned on when the Omega enables Ethernet. The Schematic shows that pin going to the NET_POW of the ethernet doc which supplies power to the center tap of the RJ45 Magnetics.

I think I need to resolve the 0V issue at Pin 25 before I can expect anything to work.

So it appears that either.

1. The Omega 2 is still not configured correctly.

2. There is something wrong with my Ethernet bridge

Any ideas on next steps to help identify the source of the issue?

Try to hardcode eth0 on Omega2 to be 192.168.101.1 and also set PC side Ethernet to be 192.168.101.2.
Then try to ping each other.

This avoid any type dhcpd mess up.

ccs_hello

For former, the required bias is 1.8V and on Omega 1's Net_Power pin, the
AR9331 itself supplies 1.8V (has an internal regulator for that) and this voltage through
Ethernet magnetics to back feed as the driver's DC bias.

There has never been a document disclosed on MT9688's required DC bias on its Ethernet MAC/PHY driver.
(May be the other brand has it, but I don't know...)

Note that although some said for Omega 2, the Net_Power out should be 3.3V and thus MT7688 Ethernet MAC should use that as its DC bias.
I am not sure about it. Quite likely it just need to be no DC bias supplied that way. (MT7688 IC does not supply 1.8V or 2V output at all.)
I have traced that Net_Power pin in the past. In PCB, it is led to be on two "un-populated 0-ohm" resistor pads.
If soldering one 0-ohm, it got patched in one circuit and if on the other position, connect to another circuit.
Currently, it is not populated. I am guessing Onion had figured out no DC bias is needed thus no 0-ohm jumper is used.

ccs_hello

I tried setting static IP on Omega2+, then restarted with

/etc/init.d/network restart

Pin from 101.1 to 101.2 times out and the same for the reverse.

I think the problem is more physical right now, or atleast a config that is not enabling the physical ethernet port to work.

The reason I say this is my Mac says this with ethernet cable pluged in between the Omega2+ and the Mac.

1. EPHY_VRT (for MT7688KN, it's pin 35; 7688AN is 39) is thru a 24K resistor to tie to the ground.
   This signal and pin voltage is not exposed to the outside world. It seems to be just for DC bias fine-tuning.

2. Both Ethernet magnetics' RX and Tx center-taps are tied together, then thru 104n to be grounded.
   HOWEVER VERY IMPORTANTLY, there is no DC bias supplying voltage to the center tap.
   I.e., Omega2's net_power (current N.C.) is fine, since no 3.3V is provided on this pin.

I will have to hand-build a test module to verify if it can work.

The Ethernet doc schematic does show that it has the RX and TX center taps tied to ground through a 49.9 ohm resistor and 100 nf cap.

So that should all be physically wired correctly.

certainly the Ethernet Dock wouldn't be sold if it didn't work so it seems that this has to be a configuration issue right?

I did not spend any time to troubleshoot. Just to validate the circuitry.

ccs_hello

Pin 1 and 6 tied together then thru 100nF to Gnd.
Pin 2 and 3 each thru 50 Ohm termination resistors to reach a 100nF capacitor. 100nF's other end tied to Gnd.
Pin 4 and 5 each thru 50 Ohm termination resistors to reach a 100nF capacitor. 100nF's other end tied to Gnd.

P.S. a low cost method is to buy a "HLK-RM04 Test Board". It's approx. $5 shipped and has a few parts to be re- purposed.
See https://www.aliexpress.com/item/Free-Shipping-Uart-WIFI-module-serial-ports-WIFI-MCU-WIFI-HLK-RM04-SCM-wifi-test-board/729142578.html or http://www.ebay.com/itm/HLK-RM04-UART-to-WIFI-Serial-Port-to-Wifi-Module-Test-Base-Board-/112318260620

ccs_hello

I thought I saw it to Vcc in schematics... Oh well, thank you very much!

I am able to use ethernet as bridge now with default firmware config or as ethernet client with my initial config.

I have made my own Ethernet expansion board on which I have placed an Ethernet switch, so that I can have more than 1 Phy. I have connected it straight there and it works perfectly. I must also mention that the switch is Auto-MDIX capable. Now I want to design a smaller version of my Ethernet expansion board (without the switch) and I really have doubt about how to connect the pins.

No cross-over.
Omega2's Tx pair goes to Ethernet magnetic's TX leads
and O's RX to magnetic's Rx.

ccs_hello

Guess the diagram you've cited is built for "naturally cross-over" for unknown reasons.

ccs_hello