DP83869HM: MII loopback setup

Sorry my console log:

ifconfig 
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        ether 02:42:d3:69:82:24  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

fm1-mac5: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 10.97.24.165  netmask 255.0.0.0  broadcast 10.255.255.255
        ether 00:04:9f:04:fd:00  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 18  bytes 1188 (1.1 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device memory 0x1ae8000-1ae8fff  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 5392  bytes 387008 (387.0 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5392  bytes 387008 (387.0 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

mac5@localhost:/sys/bus/mdio_bus/devices/1afd000:00# ping -b 10.97.0.255 -I fm1-m
PING 10.97.0.255 (10.97.0.255) from 10.97.24.165 fm1-mac5: 56(84) bytes of data.
^C
--- 10.97.0.255 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1023ms

root@localhost:/sys/bus/mdio_bus/devices/1afd000:00# cd /
root@localhost:/# ping -b 10.97.0.255 -I fm1-mac5
PING 10.97.0.255 (10.97.0.255) from 10.97.24.165 fm1-mac5: 56(84) bytes of data.
^C
--- 10.97.0.255 ping statistics ---
10 packets transmitted, 0 received, 100% packet loss, time 9200ms
pipe 3
root@localhost:/# ifconfig 
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        ether 02:42:d3:69:82:24  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

fm1-mac5: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 10.97.24.165  netmask 255.0.0.0  broadcast 10.255.255.255
        ether 00:04:9f:04:fd:00  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 18  bytes 1188 (1.1 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device memory 0x1ae8000-1ae8fff  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 5564  bytes 399712 (399.7 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5564  bytes 399712 (399.7 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Hi,

To answer you specific question, the few exception for loopback are mentioned in datasheet, other than that are working.

I could not see the images you attached in the request. I would go in following sequence to isolate the problem;

a. confirmed that PHY is configured in SGMII to Cu mode. This can be done using the OpMode register available in PHY

b. Confirm SGMII auto-negotiation is complete. Refer to SGMII status register set

c. Confirm that PHY link-up with link-partner. 

Regards,

Geet

Thanks.

The SGMII interface was the source of the problem. The phy sends the signals on the SGMII interface with ~1,25Vp-p and the receiver on the processor is able to recieve up-to 1200mV maximum. As I can see on the datasheet, the output differential voltage of the phy can be set via configuration bits(section 8.5), but I cant find the register which includes these config bits. Could you please tell me how to get the phy to set its sgmii trancieve voltage level around 800mV?

Regards,

Kristóf

Hi,

Please use below to adjust the SGMII Voltage swing.

Regards,
Geet

What should I use?

Regards,

Kristóf

Hi,

I have checked those registers. SGMII autoneg completed and phy link is up accordig to SGMII_STAT and BMSR registers, but I still cant ping anything. Do you have any idea what should I check still?

Regards,

Kristóf

Hello Kristof,

Is this issue still open?

--

Regards,

Vikram