[slisgrinder]

Good afternoon Neeraj,

Thank you for your help thus far, its really appreciated. We will make the necessary changes to our design and rev it.

Will there be a change/note in the reference design? I only ask this in case someone has a similar problem down the road.

Regards,
Kartik

[slisgrinder]

Good afternoon Neeraj,

It seems it is some weird timing issue between the PHY coming out of reset on power-up and the Octavo. I connected the reset line from the PHY to one of the GPIO on the Octavo, configured it as a GPIO with pull-up and assigned it to the MDIO interface definition in the device tree as a reset gpio (see: https://github.com/torvalds/linux/blob/4d88e3d24905eafa98cef0fc29365649ad8977b5/Documentation/devicetree/bindings/net/mdio.txt).

I am now curious to see if there is a software workaround to this hardware jumper mod so that we don’t have to do a design rev nor any modification to our existing inventory.

Thank you for your help!
Regards,
Kartik

[slisgrinder]

Good afternoon Eshtaartha,

I have ensured that the internal pull up is enabled on UART0 Rx as well as an external pull-up on UART2 Rx. I am getting intermittent boots with networking configured correctly. When the in the “failed” state, I checked PHY operation using ethtool and mii-tool, the PHY is operational with an appropriate link configuration. Simply, networking service has configured the eth0 interface to a random address as part of the “link-local” address (169.254.x.x) from /etc/networks file.

– Manually assigning a static address doesn’t yield any results. I just see a second address using ifconfig but nothing on wireshark.
– Using dhclient to issue a dhcp request doesn’t yield any results
– A reset cannot be performed using ethtool “Operation not supported”
– A reset using mii-tool does perform a soft reset but yields no results

What did work was manually hard resetting the PHY (I used tweezers to pull the reset line of the PHY low) and rebooting – without external pull ups.

May be I am interpreting this incorrectly, I wonder if it has something to with the following advisory from the AM335x ERRATA “Advisory 1.0.23 – Ethernet Media Access Controller (EMAC) and Switch Subsystem Reset Isolation Feature is not Supported”. Could it possibly be “looking” at a different interface as part of the dual Gigabit interface?

As a note, I always have wireshark running to sniff the packets and “doesn’t yield any results” is I don’t see any packets on the line.

I appreciate you help,
Kartik

[slisgrinder]

An update of my findings from yesterday:

I double checked the pull-up/down states of UART0 and UART2 pins and they are correct however, if I connect +3v3 to any of the UART0 or UART2 Rx lines, the system boots up fine and ethernet interface sets up and authenticates correctly to the network.

Is there a system service that is watching these lines?
Is there some timing requirement that I am missing?

Regards,
Kartik

[slisgrinder]

To provide more details on the problem,

Interface is brought up but it assigns itself a “random” ip address based on the “/etc/networks” file:

debian@beaglebone:~$ ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,DYNAMIC,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 98:5d:ad:6b:da:61 brd ff:ff:ff:ff:ff:ff inet 169.254.52.156/16 brd 169.254.255.255 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::9a5d:adff:fe6b:da61/64 scope link valid_lft forever preferred_lft forever 3: usb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000 link/ether 98:5d:ad:6b:da:63 brd ff:ff:ff:ff:ff:ff inet 192.168.7.2/30 brd 192.168.7.3 scope global usb0 valid_lft forever preferred_lft forever 4: usb1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000 link/ether 98:5d:ad:6b:da:66 brd ff:ff:ff:ff:ff:ff inet 192.168.6.2/30 brd 192.168.6.3 scope global usb1 valid_lft forever preferred_lft forever 5: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10 link/can 6: can1: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10 link/can

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

debian@beaglebone:~$ ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00     inet 127.0.0.1/8 scope host lo        valid_lft forever preferred_lft forever     inet6 ::1/128 scope host        valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,DYNAMIC,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000     link/ether 98:5d:ad:6b:da:61 brd ff:ff:ff:ff:ff:ff     inet 169.254.52.156/16 brd 169.254.255.255 scope global eth0        valid_lft forever preferred_lft forever     inet6 fe80::9a5d:adff:fe6b:da61/64 scope link        valid_lft forever preferred_lft forever 3: usb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000     link/ether 98:5d:ad:6b:da:63 brd ff:ff:ff:ff:ff:ff     inet 192.168.7.2/30 brd 192.168.7.3 scope global usb0        valid_lft forever preferred_lft forever 4: usb1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000     link/ether 98:5d:ad:6b:da:66 brd ff:ff:ff:ff:ff:ff     inet 192.168.6.2/30 brd 192.168.6.3 scope global usb1        valid_lft forever preferred_lft forever 5: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10     link/can 6: can1: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10     link/can

I’ve tried to manually assign an ip address, changed back to dhcp, enable and disable the interface using connmanctl but with no luck. Ive manually enabled and disabled various services from “/etc/systemd/system/” folder and that still doesn’t help.

Am I missing something super simple that its hiding in plain sight?

 

Regards,

Kartik

• This reply was modified 5 years, 2 months ago by slisgrinder. Reason: incorrect console output

[slisgrinder]

I could not upload .txt files so here are pastebin links:
No working ethernet: https://pastebin.com/1EDpUs8S
Working ethernet: https://pastebin.com/RRdNT6n2

[slisgrinder]

Good evening Neeraj,

Thanks for the info. I managed to get RTS/CTS defined and enabled in am335x-boneblack-uboot-univ.dtb. In the spirit of product development I already ran into another issue but that’s on our end.

Thank you for your help!
Regards,
Kartik

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