NanoPI NEO custom image dead

[KernelPanic]

Dear Sirs and Madams!

I am trying to build custom image (I need very minimal kernel with low latency performance) for NanoPI NEO and therefore I have been following Make Your Own OS section of tutorial. I've succesfully configured and compiled kernel, I've done it many times before for other microprocessors, I've followed Manual Build HOWTO and when I power up NanoPI NEO with inserted micro sd card with new kernel, I get no activity on /dev/ttyUSB0. I am aware blue LED should blink, but only green LED turns on (power). What am I doing wrong?

[lawrence]

If you change the kernel configuration, you'd better recompile the kernel module and update to the rootfs.

[KernelPanic]

I did recompile kernel, moreover, without errors and uImage is created:

developer001@work002:~/Projects/projectMIDI/lichee/out/sun8iw7p1/linux/common$ ls -asl
total 70740
4 drwxrwxr-x 3 developer001 developer001 4096 okt 28 08:39 .
4 drwxrwxr-x 3 developer001 developer001 4096 okt 28 08:31 ..
136 -rw-rw-r-- 1 developer001 developer001 137130 nov 7 20:28 arisc
13500 -rw-r--r-- 1 developer001 developer001 13824000 nov 7 20:28 boot.img
4 drwxrwxr-x 3 developer001 developer001 4096 okt 28 08:31 buildroot
92 -rw-rw-r-- 1 developer001 developer001 1048576 nov 7 20:28 rootfs.ext4
4628 -rw-rw-r-- 1 developer001 developer001 4736624 nov 7 20:28 uImage
47744 -rw-rw-r-- 1 developer001 developer001 48887968 nov 7 20:28 vmlinux.tar.bz2
4628 -rwxrwxr-x 1 developer001 developer001 4736560 nov 7 20:28 zImage

I was looking at the dates of files creation it consists with build process task end.