设备树替换
Seeed在出厂烧录的固件中挂载的设备树为stm32mp1-seeed-npi-base.dtb,默认情况下此设备树是不支持Wi-Fi的，如需使用Wifi功能就需要挂载stm32mp1-seeed-npi-full.dtb这个设备树。

直接修改uEnv.txt文件，此文件会在uboot引导Linux内核的时候主动去加载/boot/dtbs/4.19.9-stm32-r1目录下指定的设备树文件。

1.打开uEnv.txt
vim /boot/uEnv.txt

2.编辑uEnv.txt文件将dtb修改为stm32mp1-seeed-npi-full.dtb

1. uname_r=4.19.9-stm32-r1
   
2. #uuid=
   
3. dtb=stm32mp1-seeed-npi-full.dtb                ##修改此处
   
4. 
   
5. ###U-Boot Overlays###
   
6. 
   
7. ###Master Enable
   
8. enable_uboot_overlays=1
   
9. ###
   
10. ###custom overlays
    
11. uboot_overlay_addr0=/lib/firmware/stm32mp1-seeed-pwm-overlay.dtbo
    
12. 
    
13. 
    
14. #uboot_overlay_addr0=/lib/firmware/<file0>.dtbo
    
15. #uboot_overlay_addr1=/lib/firmware/<file1>.dtbo
    
16. #uboot_overlay_addr2=/lib/firmware/<file2>.dtbo
    
17. #uboot_overlay_addr3=/lib/firmware/<file3>.dtbo
    
18. #uboot_overlay_addr4=/lib/firmware/<file4>.dtbo
    
19. #uboot_overlay_addr5=/lib/firmware/<file5>.dtbo
    
20. #uboot_overlay_addr6=/lib/firmware/<file6>.dtbo
    
21. #uboot_overlay_addr7=/lib/firmware/<file7>.dtbo
    
22. ###
    
23. ###U-Boot fdt tweaks... (60000 = 384KB)
    
24. #uboot_fdt_buffer=0x60000
    
25. ###U-Boot Overlays###
    
26. 
    
27. cmdline=coherent_pool=1M net.ifnames=0 quiet
    
28. 
    
29. #In the event of edid real failures, uncomment this next line:
    
30. #cmdline=coherent_pool=1M net.ifnames=0 quiet video=HDMI-A-1:1024x768@60e
    
31. 
    
32. #Use an overlayfs on top of a read-only root filesystem:
    
33. #cmdline=coherent_pool=1M net.ifnames=0 quiet overlayroot=tmpfs
    
34. 
    
35. ##enable Generic eMMC Flasher:
    
36. ##make sure, these tools are installed: dosfstools rsync
    
37. #cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v3-stm32mp1.sh
    
38. 
    
39. 
    
40. # specify kernel eth0 mac address
    
41. ethaddr=42:9a:42:e1:f7:23

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Wi-Fi连接

1. robot@ev3dev:~$ sudo connmanctl
   
2. Error getting VPN connections: The name net.connman.vpn was not provided by any
   
3. connmanctl> enable wifi
   
4. Enabled wifi
   
5. connmanctl> scan wifi
   
6. Scan completed for wifi
   
7. connmanctl> services
   
8. *AO Wired                ethernet_b827ebbde13c_cable
   
9.                          wifi_e8de27077de3_hidden_managed_none
   
10.     AH04044914           wifi_e8de27077de3_41483034303434393134_managed_psk
    
11.     Frissie              wifi_e8de27077de3_46726973736965_managed_psk
    
12.     ruijgt gast          wifi_e8de27077de3_7275696a67742067617374_managed_psk
    
13.     schuur               wifi_e8de27077de3_736368757572_managed_psk
    
14. connmanctl> agent on
    
15. Agent registered
    
16. connmanctl> connect wifi_e8de27077de3_41483034303434393134_managed_psk                ##对应的wifi名称的实际编码
    
17. Agent RequestInput wifi_e8de27077de3_41483034303434393134_managed_psk
    
18.   Passphrase = [ Type=psk, Requirement=mandatory ]
    
19. Passphrase? *************                        ##wifi密码
    
20. Connected wifi_e8de27077de3_41483034303434393134_managed_psk
    
21. connmanctl> quit

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我们可以使用下面的指令来找到ODYSSEY – STM32MP157C的IP地址：

1. ifconfig

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