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想请教一下在kernel编译中，是不是只需要在menuconfig中打开下面的配置，编译就能使用吗？

PHY Device support and infrastructure  --->
      <*>   Realtek PHYs

在设备树中添加了相关信息：

&emac0 {
	pinctrl-names = "default";
	pinctrl-0 = <&ext_rgmii_pins>;
	phy-mode = "rgmii";
	phy-handle = <&ext_rgmii_phy>;
	allwinner,rx-delay-ps = <1800>;
	allwinner,tx-delay-ps = <700>;
	status = "okay";
};

&mdio0 {
	ext_rgmii_phy: ethernet-phy@1 {
		compatible = "ethernet-phy-ieee802.3-c22";
		reg = <1>;
	};
};

我在添加了上面的两部分后使用ifconfig -a只有lo，其他都没有显示，使用 ifconfig eth0 up 后显示的是

ifconfig: SIOCGIFFLAGS: No such device

解决了大伙，就是没焊好！！！

@evler 大佬，uboot编译完 通过USB启动uboot后会乱码这是为啥呀

U-Boot SPL 2023.07-rc3-dirty (May 31 2023 - 22:33:38 +0800)
DRAM: 1024 MiB
Trying to boot from FEL
NOTICE:  BL31: v2.9(debug):v2.9.0-51-gc0d8ee386
NOTICE:  BL31: Built : 12:13:51, May 30 2023
NOTICE:  BL31: Detected Allwinner H616 SoC (1823)
NOTICE:  BL31: Found U-Boot DTB at 0x4a097120, model: OrangePi Zero2
INFO:    ARM GICv2 driver initialized
INFO:    Configuring SPC Controller
INFO:    PMIC: Probing AXP305 on RSB
ERROR:   RSB: set run-time address: 0x10003
INFO:    Could not init RSB: -65539
INFO:    BL31: Platform setup done
INFO:    BL31: Initializing runtime services
INFO:    BL31: cortex_a53: CPU workaround for 855873 was applied
INFO:    BL31: cortex_a53: CPU workaround for 1530924 was applied
INFO:    PSCI: Suspend is unavailable
INFO:    BL31: Preparing for EL3 exit to normal world
INFO:    Entry point address = 0x4a000000
INFO:    SPSR = 0x3c9
INFO:    Changed devicetree.


U-Boot 2023.07-rc3-dirty (May 31 2023 - 22:33:38 +0800) Allwinner Technology

CPU:   Allwinner H616 (SUN50I)
Model: OrangePi Zero2
DRAM:  1 GiB
Core:  48 devices, 18 uclasses, devicetree: separate
WDT:   Not starting watchdog@30090a0
MMC:   mmc@4020000: 0
Loading Environment from FAT... Card did not respond to voltage select! : -110
** Bad device specification mmc 0 **
In:    serial@5000000
Out:   serial@5000000
Err:   serial@5000000
Net:   Could not get PHY for ethernet@5020000: addr 1
No ethernet found.

Hit any key to stop autoboot:  0
=> d device specification mmc 0 **
Unknown command 'd' - try 'help'
=>
Unknown command 'd' - try 'help'                                                                                          0> ɥ▒▒▒▒▒
> Err::▒с▒▒*▒▒K▒Y▒hernet@5020000: addr 1
>
> No ethernet found.
>
>
>
> ▒▒Z▒偢▒▒▒ѽ▒
> ▒ѽ▒▒▒▒C▒=> d device specification mmc 0 **▒▒▒
>
> Unknown command 'd' - try 'help'
>
> =>
>
> Unknown command 'd' - try 'help'
>
>>> Err::▒с▒▒*▒▒K▒Y▒hernet@5020000: addr 1>> Unknown command 'd' - try 'help>> =>>> Unknown command 'd' - try 'help>> => ▒▒ɥ▒        >> Err::▒с▒▒*▒▒K▒Y▒hernet@5020000: addr 1>> No ethernet found>>>> ▒▒Z▒偢                               >> Unknown command 'd' - try 'help>> =>>> Unknown command 'd' - try 'help>> => ▒▒ɥ▒        >> Err::▒с▒▒*▒▒K▒Y▒hernet@5020000: addr 1>> No ethernet found>>>> ▒▒Z▒偢▒▒▒ѽ▒> ▒ѽ▒▒▒▒                                            >> Unknown command 'd' - try 'help>> =>>> Unknown command 'd' - try 'help>> => ▒▒ɥ▒        >> Err::▒с▒▒*▒▒K▒Y▒hernet@5020000: addr 1>> No ethernet found>>>> ▒▒Z▒偢▒▒▒ѽ▒> ▒ѽ▒▒▒▒                                            >> Unknown command 'd' - try 'help>> =>>> Unknown command 'd' - try 'help>> => ▒▒ɥ▒        >> Err::▒с▒▒*▒▒K▒Y▒hernet@5020000: addr 1>> No ethernet found>>>> ▒▒Z▒偢▒▒▒ѽ▒> ▒ѽ▒▒▒▒                                            >> Unknown command 'd' - try 'help>> =>>> Unknown command 'd' - try 'help>> => ▒▒ɥ▒        >>>

@evler 确实是串口问题

@evler 我试试，但是用其他的镜像运行都挺正常的，然后好像Loading Environment from FAT... Card did not respond to voltage select! : -110这行和你的输出日志有点对不上