Disable random ethernet mac address generation

• OJ

  O. JUD

  10/13/22, 3:24 PM

  Hi , 

  Is there a way to fix the mac address on EVK board I-Pi SMARC Plus IMX8M ? 

  I'm using Yocto a build image from adlink-lec-imx8mp-yocto-hardknott_1v2.xml 

  I read about efuse register need to be updated but how ? 

  Regards

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• KK

  Kothandaraman Kannadasan Staff member

  10/18/22, 2:09 AM

  Dear @O. JUD, It is possible to fix the mac address. Please follow the below steps,

  • Boot into U-BOOT (emmc boot) and type the following commands,

             => setenv ethaddr 00:11:22:33:44:55

             => setenv eth1addr 00:11:22:33:44:56

             => saveenv

             => boot

  • Login as 'root' and check the address by the following command,

            # ifconfig

  In regards to updating the Efuse register, we are doing our best to do so. If we get any information, we will contact you.

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• OJ

  O. JUD

  3/13/23, 12:05 PM

  Hi , 

  Do you have any update regarding the way to fix mac adress on the SMARC card ? 

  I really need to know if booting the system (u-boot or OS ) is mandatory in order to set interfaces Mac address.

  Does the Mac can be set by you (ADLINK) when we order new modules ? 

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• KK

  Kothandaraman Kannadasan Staff member

  3/14/23, 8:27 AM

  Dear @O. JUD, Module MAC addresses are not set by us. It is by default that the MAC address will change randomly, but if you would like a fixed MAC address, you can do so.

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• OJ

  O. JUD

  3/16/23, 7:53 PM

  @Kothandaraman Kannadasan 

  It is weird because after each reboot the mac address starts with 00:30:64 which os a reserved range for ADLINK. 

  I try to change the U-boot environnement from userspace with fw_printenv and fw_setenv  command  from libubootenv-bin. i tried to configue /etc/fw_env.config file with  this content : 

  /dev/mmcblk2 0x400000 0x1000

  but i have this output with fw_printenv command :

  Cannot read environment, using default
  Cannot read default environment from file

  Do you know how to solve ? 

   

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