BBB not booting up, Need Help!!

Hi all,

I am a newbie hobbyist(pardon me for silly questions due to lack of knowledge) and ran into a problem when i was trying to update my Linux kernel on BBB for which i did following:

  1. Built linux kernel 4.4.8 for bbb

  2. placed “zImage_new” into /boot/uboot of my bbb(while keeping original zImage also)

  3. edited uEnv.txt “Kernel_image=zImage” to “Kernel_image=zImage_new”

  4. rebooted

after this, whenever I am trying to boot my BBB, I am just getting all four LED’s constantly ON for some 30 sec or so then a small break and then again ON. I came to know that I was supposed to do many more things before rebooting only after doing it. Now I just want to get access to uEnv.txt so as to replace back my changes to “Kernel_image=zImage”. I tried to look for the boot log for which I connected J1 serial debug header to USB-Serial-Converter cable and again booted up in “Minicom”. Here all I can see is unrecognizable symbols,which I thought may be coz of Baud rate mismatch,for which I tried all baud rates possible but there was no success. Is there something I am doing wrong??

I referred to BBB_SRM and https://elinux.org/Beagleboard:BeagleBone_Black_Serial

Thanks in advance for any sort of help or clue…

Regards,
Gaurav

"Kernel_image=zImage". I tried to look for the boot log for which I
connected J1 serial debug header to USB-Serial-Converter cable and again
booted up in "Minicom". Here all I can see is unrecognizable symbols,which
I thought may be coz of Baud rate mismatch,for which I tried all baud rates
possible but there was no success. Is there something I am doing wrong??

Don't use minicom if you don't know what your doing..

Use gtkterm/cutecom/tio instead..

Regards,

On Wed, 30 May 2018 21:53:00 -0700 (PDT),
djoygaurav@gmail.com declaimed the following:

ON. I came to know that I was supposed to do many more things before
rebooting only after doing it. Now I just want to get access to uEnv.txt so
as to replace back my changes to "Kernel_image=zImage". I tried to look for

  Will the device boot from a stock image on SD card? If it will, you
could then mount the eMMC and do your edits to the file contents. Shutdown,
remove SD card, reboot...