Ethernet MAC address

Duo
1

Every time I build a new image, I get a new MAC address, so DHCP issues a new IP address.
It would be nice if you could have a persistent address, or to be able to set it manually during the build.

2

There are lots of ways to achieve this. The simplest method is to set and save the environment variable in u-boot, e.g.

Warning: ethernet@4070000 (eth0) using random MAC address - 86:27:15:cb:f9:b5
eth0: ethernet@4070000
Hit any key to stop autoboot:  0 
cv180x_c906# 
cv180x_c906# setenv ethaddr aa:bb:cc:dd:11:22
cv180x_c906# saveenv
Saving Environment to NAND... Erasing NAND...
Erasing at 0x880000 -- 100% complete.
Writing to NAND... OK
OK
cv180x_c906# printenv ethaddr 
ethaddr=aa:bb:cc:dd:11:22
1 Like
3

Thanks. Is there a way to set this when I write the SD card or build a new image?
I also want to disable the Console writing to tty0.

1 Like
4

You might consider setting the default MAC in u-boot-2021.10/include/configs/cv180x-asic.h e.g.

diff --git a/u-boot-2021.10/include/configs/cv180x-asic.h b/u-boot-2021.10/include/configs/cv180x-asic.h
index 20d842ab3..fed89aa23 100644
--- a/u-boot-2021.10/include/configs/cv180x-asic.h
+++ b/u-boot-2021.10/include/configs/cv180x-asic.h
@@ -256,6 +256,7 @@
        #endif
 
        #define CONFIG_EXTRA_ENV_SETTINGS       \
+               "ethaddr=aa:bb:cc:dd:11:22\0" \
                "netdev=eth0\0"         \
                "consoledev=" CONSOLEDEV  \
                "baudrate=115200\0" \

Another effective method is to set in /etc/network/interfaces.

2 Likes