Serge

added &mmc2 section into ****nanopi-neo.dts
from folder /usr/src/build/cache/sources/u-boot/v2019.04 run
"git diff arch/arm/dts/sun8i-h3-nanopi-neo.dts > /usr/src/build/patch/kernel/sunxi-dev/my-neo-emmc.patch"
from /usr/src/buid run ./compile.sh
...
"dd if=/tmp/u-boot-sunxi-with-spl.bin of=/dev/mmcblk1 bs=1024 seek=8"
reboot without SD - fault
 
BTW. ***nanopi-neo.dts hasn't &mmc2 section again. Looks like patch wasn't applied. 
 
I've copied .diff file to the same folder as Igor's destination: ./patch/u-boot/u-boot-sunxi
from /usr/src/buid run ./compile.sh
...
"dd if=/tmp/u-boot-sunxi-with-spl.bin of=/dev/mmcblk1 bs=1024 seek=8"
and 
"dd if=/tmp/u-boot-sunxi-with-spl.bin of=/dev/mmcblk1p1 bs=1024 seek=8" (I'm not sure but I did it)
 
reboot without SD - SUCCESS!!!
 
Thank you martinayotte&Igor for your support
 
P.S.
last (I hope) doubt....
"dd if=/tmp/u-boot-sunxi-with-spl.bin of=/dev/mmcblk1 bs=1024 seek=8"
this command will copy a .bin file into the root folder on eMMC... how it will be read by system during the load?
no .bin files in SD-card's nor "/boot" folder nor "/ "folder
current configuration: ls /dev | grep mmcblk
mmcblk0
mmcblk0p1
mmcblk1
mmcblk1boot0
mmcblk1boot1
mmcblk1p1