[参考译文] AM3352：在 u-boot 中设置 MAC 地址不会反映在 Linux 中

您好、

我设法解决了这个问题、这是设备树的问题。 在升级到较新的 Yocto 版本期间、由于网络正常工作、设备树的原始网络部分未修改。 我以"am335x-bone-commot.dtsi"为基础修改了器件树。 下面是我所做的更改。

旧 DTS：

&cpsw_emac0 {
	phy_id = <&davinci_mdio>, <0>;
	phy-mode = "mii";
};

&mac {
	pinctrl-names = "default";
	pinctrl-0 = <&mii1_pins_default>;
	status = "okay";
};

&davinci_mdio {
	pinctrl-names = "default";
	pinctrl-0 = <&mdio_pins_default>;
	status = "okay";
};

新 DTS：

&cpsw_port1 {
	phy-handle = <&ethphy0>;
	phy-mode = "mii";
	ti,dual-emac-pvid = <1>;
};

&cpsw_port2 {
	status = "disabled";
};

&mac_sw {
	pinctrl-names = "default";
	pinctrl-0 = <&mii1_pins_default>;
	status = "okay";
};

&davinci_mdio_sw {
	pinctrl-names = "default";
	pinctrl-0 = <&mdio_pins_default>;

	ethphy0: ethernet-phy@0 {
		reg = <0>;
	};
};

UBoot 日志：

U-Boot 2023.04-gc30478b7-dirty (Apr 24 2025 - 13:20:35 +0200)

CPU  : AM335X-GP rev 2.1
Model: TI AM335x BeagleBone Black
DRAM:  512 MiB
Core:  161 devices, 18 uclasses, devicetree: separate
WDT:   Started wdt@44e35000 with servicing every 1000ms (60s timeout)
NAND:  0 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from FAT... OK
Net:
Warning: ethernet@4a100000 MAC addresses don't match:
Address in ROM is               88:0c:e0:3f:d3:0e
Address in environment is       d4:84:31:9c:68:02
eth2: ethernet@4a100000
Warning: usb_ether MAC addresses don't match:
Address in ROM is               de:ad:be:ef:00:01
Address in environment is       d4:84:31:9c:68:03
, eth3: usb_ether
Hit any key to stop autoboot:  0
=> print ethaddr
ethaddr=00:11:22:33:44:55

我收到了一些关于 MAC 地址不同于环境和 ROM 的警告、因此必须查看它的来源(可能只是我在测试时打破常规)

确认它已在 Linux 中设置：

root@ipb5:~# dmesg | grep cpsw
[    1.930560] cpsw-switch 4a100000.switch: initialized cpsw ale version 1.4
[    1.937552] cpsw-switch 4a100000.switch: ALE Table size 1024
[    1.960359] cpsw-switch 4a100000.switch: cpts: overflow check period 500 (jiffies)
[    1.968160] cpsw-switch 4a100000.switch: CPTS: ref_clk_freq:250000000 calc_mult:2147483648 calc_shift:29 error:0 nsec/sec
[    2.000270] cpsw-switch 4a100000.switch: Detected MACID = 00:11:22:33:44:55
[    2.008591] cpsw-switch 4a100000.switch: initialized (regs 0x4a100000, pool size 256) hw_ver:0019010C 1.12 (0)
[   11.855716] cpsw-switch 4a100000.switch: starting ndev. mode: dual_mac
[   14.191158] cpsw-switch 4a100000.switch eth0: Link is Up - 100Mbps/Full - flow control off


root@ipb5:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000
    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 noprefixroute
       valid_lft forever preferred_lft forever
2: sit0@NONE: <NOARP> mtu 1480 qdisc noop qlen 1000
    link/sit 0.0.0.0 brd 0.0.0.0
3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq qlen 1000
    link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.131/24 brd 192.168.0.255 scope global dynamic eth0
       valid_lft 86290sec preferred_lft 86290sec
    inet6 fe80::211:22ff:fe33:4455/64 scope link
       valid_lft forever preferred_lft forever