Actions
Forum Thread Details
  • Replies 4 replies
  • Subscribers 105 subscribers
  • Views 3335 views
  • Users 0 members are here
Related

Beaglebone Black (rev. C) booting from Ethernet (RJ45)

elem2018

Hello,

 

I have a BBB rev. C, trying to boot it from ethernet (RJ45) in the sequence of MLO ---> u-boot.img  ---> zImage.bin.  MLO, u-boot.img and zImage.bin are located in the same folder /tftpboot

Following configurations are done in /etc/dhcp/dhcpd.conf

------------------------------------------------------

subnet 192.168.0.0 netmask 255.255.255.0 {

  range 192.168.0.2 192.168.0.100;

  if substring (option vendor-class-identifier, 0, 10) = "AM335x ROM"

  {

    filename "MLO";

  }

  elsif substring (option vendor-class-identifier, 0, 10) = "DM814x ROM"

  {

    filename "MLO";

  }

  elsif substring (option vendor-class-identifier, 0, 17) = "AM335x U-Boot SPL"

  {

    filename "u-boot.img";

  }

  else

  {

    filename "zImage.bin";

  }

}

------------------------------------------------------

I confirm that either tftp and dhcp server works fine, because I tested them in u-boot from a bootable SD card.

Then I removed the SD card, cleaned emmc (writing zeros into emmc) and reset BBB.  I expected that the rom loader in BBB

will read the configration from the dhcpd.conf via ethernet and boot first MLO, then u-boot.img and finally the zImage.bin.

 

But what I see are only CCCCCCC...

Am I missing something in configuration? Would you please help me to make the BBB bootable (MLO, u-boot.img and zImag.bin) from Ethernet?

 

Thanks

Xi

Parents

  • Thanks for your answer. After lots of google I believe you are right, on BBB direct ethernet boot from RJ45 is impossible. But could you please give me some hints how to write the SD card image (at least MLO and u-boot) into emmc? I unfrotunately wrote zeros into emmc. I tried to hold the S2 swtich during SD boot for 10 seconds, but no emmc flashing happened.  What is the right way to falsh the emmc?

    Regards

    Xi

Reply

  • Thanks for your answer. After lots of google I believe you are right, on BBB direct ethernet boot from RJ45 is impossible. But could you please give me some hints how to write the SD card image (at least MLO and u-boot) into emmc? I unfrotunately wrote zeros into emmc. I tried to hold the S2 swtich during SD boot for 10 seconds, but no emmc flashing happened.  What is the right way to falsh the emmc?

    Regards

    Xi

Children
  • in reply to elem2018

    If you have already downloaded and burnt the last BB image to an SD card,

     

    1. Take the SD card and place it back into the system used to burn the image

     

    2. Navigate to '/boot' the  folder and edit the uEnv.txt file and uncomment (remove the '#' symbol) for the following line:

     

    #cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v2.sh

     

    3. Place the SD card back into the BBB and power it on.  The emmc should start flashing at this point; no need to push the boot button.

     

    4. Once the flash is complete, power off the BBB again, remove the SD card.

     

    5. Place it back into another system and comment out the line mentioned previously again.

     

    6. Place the card back into the BBB, and power it on.  

     

    If all went well, the board should boot normally  and emmc should be updated.

     

    Hopefully I did not miss anything