DESK-MX6UL-L/Pheripherals/Ethernet

From DAVE Developer's Wiki
Jump to: navigation, search
History
Version Issue Date Notes

1.0.0

Apr 2021 First DESK release
2.0.0 Mar 2022 DESK 3.0.0 release



Peripheral Ethernet[edit | edit source]

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

Device tree configuration[edit | edit source]

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 peripheral[edit | edit source]

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

Linux messages at boot time[edit | edit source]

...
...
[    2.542709] libphy: fec_enet_mii_bus: probed
[    2.550888] fec 2188000.ethernet eth0: registered PHC device 0
[   28.416349] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
...
...
[   25.277622] 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)
...
...

Cable connection:

...
...
[  194.804822] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  194.812820] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
...
...

Check the interface with ifconfig[edit | edit source]

root@desk-mx6ul-axelulite:~# ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.4.79  netmask 255.255.255.0  broadcast 192.168.4.255
        inet6 fe80::ec4e:d7ff:fe22:686b  prefixlen 64  scopeid 0x20<link>
        ether ee:4e:d7:22:68:6b  txqueuelen 1000  (Ethernet)
        RX packets 360  bytes 87455 (85.4 KiB)
        RX errors 0  dropped 95  overruns 0  frame 0
        TX packets 134  bytes 20021 (19.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Test with iperf[edit | edit source]

root@desk-mx6ul-axelulite:~# iperf3 -t 5 -c 192.168.4.47
Connecting to host 192.168.4.47, port 5201
[  5] local 192.168.4.79 port 57824 connected to 192.168.4.47 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  11.1 MBytes  93.0 Mbits/sec    0    150 KBytes       
[  5]   1.00-2.00   sec  10.9 MBytes  91.3 Mbits/sec    0    150 KBytes       
[  5]   2.00-3.00   sec  10.8 MBytes  90.2 Mbits/sec    0    150 KBytes       
[  5]   3.00-4.00   sec  10.8 MBytes  90.7 Mbits/sec    0    150 KBytes       
[  5]   4.00-5.00   sec  10.6 MBytes  89.0 Mbits/sec    0    150 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-5.00   sec  54.2 MBytes  90.8 Mbits/sec    0             sender
[  5]   0.00-5.02   sec  53.9 MBytes  90.0 Mbits/sec                  receiver

iperf Done.