DESK-MX6UL-L/Peripherals/Ethernet

History
Version	Issue Date	Notes
1.0.0	Apr 2021	First DESK release

Contents

Peripheral EthernetEdit

The ethernet interface is made available through the i.MX6UL fec interface which should be initialized on the device tree.

Device tree configurationEdit

Here below an example of device tree configuration used on standard DAVE's kit for the AXEL ULite SOM:

From imx6ul-axelulite.dtsi:

&fec1 {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_enet1>;
        phy-mode = "rmii";
        phy-handle = <&ethphy0>;
        status = "okay";

        mdio {
                #address-cells = <1>;
                #size-cells = <0>;

                ethphy0: ethernet-phy@3 {
                        compatible = "ethernet-phy-ieee802.3-c22";
                        reg = <3>;
                };
        };
};
...
...
&iomuxc {
...
...
                pinctrl_enet1: enet1grp {
                        fsl,pins = <
                                MX6UL_PAD_ENET1_RX_EN__ENET1_RX_EN      0x1b0b0
                                MX6UL_PAD_ENET1_RX_ER__ENET1_RX_ER      0x1b0b0
                                MX6UL_PAD_ENET1_RX_DATA0__ENET1_RDATA00 0x1b0b0
                                MX6UL_PAD_ENET1_RX_DATA1__ENET1_RDATA01 0x1b0b0
                                MX6UL_PAD_ENET1_TX_EN__ENET1_TX_EN      0x1b0b0
                                MX6UL_PAD_ENET1_TX_DATA0__ENET1_TDATA00 0x1b0b0
                                MX6UL_PAD_ENET1_TX_DATA1__ENET1_TDATA01 0x1b0b0
                                MX6UL_PAD_ENET1_TX_CLK__ENET1_REF_CLK1  0x4001b0a8
                                MX6UL_PAD_GPIO1_IO07__ENET1_MDC         0x1b0b0
                                MX6UL_PAD_GPIO1_IO06__ENET1_MDIO        0x1b0b0
                                MX6UL_PAD_SNVS_TAMPER1__GPIO5_IO01      0x1b0b0         /* ETH_PHY_RST */
                                MX6UL_PAD_SNVS_TAMPER2__GPIO5_IO02      0x1b0b0         /* ETH_INT */
                        >;
                };

...
...
};

Accessing the peripheralEdit

AXEL ULite SOM provides the primary network interface mapped at eth0.

Linux messages at boot timeEdit

...
...
[    2.744506] fec 2188000.ethernet: 2188000.ethernet supply phy not found, using dummy regulator
[    2.829240] libphy: fec_enet_mii_bus: probed
[    2.846511] fec 2188000.ethernet eth0: registered PHC device 0
[    8.004148] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
...
...
[    5.364364] Micrel KSZ8081 or KSZ8091 2188000.ethernet-1:03: attached PHY driver [Micrel KSZ8081 or KSZ8091] (mii_bus:phy_addr=2188000.ethernet-1:03, irq=POLL)
[    5.379786] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready

Cable connection:

...
...
[    8.484123] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[    8.503416] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[    8.533451] IP-Config: Complete:
[    8.536868]      device=eth0, hwaddr=7a:f5:7c:86:e3:ac, ipaddr=192.168.0.90, mask=255.255.255.0, gw=255.255.255.255

Check the interface with ifconfigEdit

ifconfroot@desk-mx6ul-axelulite:~# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 7a:f5:7c:86:e3:ac
          inet addr:192.168.0.90  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::78f5:7cff:fe86:e3ac/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:17910 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7633 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:18948844 (18.0 MiB)  TX bytes:1515852 (1.4 MiB)

root@desk-mx6ul-axelulite:~#

Test with iperfEdit

root@desk-mx6ul-axelulite:~# iperf3 -c 192.168.0.125
Connecting to host 192.168.0.125, port 5201
[  5] local 192.168.0.120 port 41332 connected to 192.168.0.125 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  10.7 MBytes  90.0 Mbits/sec    0    127 KBytes
[  5]   1.00-2.00   sec  10.8 MBytes  90.2 Mbits/sec    0    154 KBytes
[  5]   2.00-3.00   sec  11.2 MBytes  93.5 Mbits/sec    0    175 KBytes
[  5]   3.00-4.00   sec  11.0 MBytes  92.6 Mbits/sec    0    185 KBytes
[  5]   4.00-5.00   sec  11.1 MBytes  93.1 Mbits/sec    0    195 KBytes
[  5]   5.00-6.00   sec  11.1 MBytes  93.2 Mbits/sec    0    195 KBytes
[  5]   6.00-7.00   sec  11.1 MBytes  93.4 Mbits/sec    0    212 KBytes
[  5]   7.00-8.00   sec  10.9 MBytes  91.4 Mbits/sec    0    212 KBytes
[  5]   8.00-9.00   sec  11.2 MBytes  94.3 Mbits/sec    0    212 KBytes
[  5]   9.00-10.00  sec  11.1 MBytes  92.8 Mbits/sec    0    212 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   110 MBytes  92.5 Mbits/sec    0             sender
[  5]   0.00-10.00  sec   110 MBytes  92.1 Mbits/sec                  receiver

iperf Done.
root@desk-mx6ul-axelulite:~#

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