DESK-MX6UL-L/Peripherals/Ethernet
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| Apr 2021 | First DESK release | ||
| 2.0.0 | Mar 2022 | DESK 3.0.0 release | |
Contents
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 = <ðphy0>;
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.
