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:
Built linux kernel 4.4.8 for bbb
placed “zImage_new” into /boot/uboot of my bbb(while keeping original zImage also)
edited uEnv.txt “Kernel_image=zImage” to “Kernel_image=zImage_new”
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…