Palaretri

Hi all,
I'm working with a BPI-P2 board.
I installed the last Armbian version for BPI-M2 as the two boards are basically the same except the RJ45 connector and the eMMC.
 
I installed it on an SD card, and everythig worked perfectly.
 
Now I need to put the OS on the eMMC and then completely remove the SD card, but I'm struggling.
 
The default Armbian for BPI-M2 is not intended to support eMMC, so I'm not surprised that with this version the eMMC dosn't show up.
 
So I tried to modify the dtb and enable the eMMC nodes, and then reboot.
Here the changes I made:
 
mmc@1c10000 {
            reg = < 0x1c10000 0x1000 >;
            pinctrl-names = "default";
            pinctrl-0 = < 0x0d >;
            resets = < 0x03 0x08 >;
            reset-names = "ahb";
            interrupts = < 0x00 0x3d 0x04 >;
            status = "okay";
            #address-cells = < 0x01 >;
            #size-cells = < 0x00 >;
            compatible = "allwinner,sun7i-a20-mmc";
            clocks = < 0x03 0x17 0x03 0x4a 0x03 0x4c 0x03 0x4b >;
            clock-names = "ahb\0mmc\0output\0sample";
            vmmc-supply = < 0x0b >;
            vqmmc-supply = < 0x0b >;
            mmc-pwrseq = < 0x0e >;
            bus-width = < 0x04 >;
            non-removable;
            phandle = < 0x44 >;
 
            mmc2-8bit-pins {
                pins = "PC5\0PC6\0PC8\0PC9\0PC10\0PC11\0PC12\0PC13\0PC14\0PC15\0PC16";
                function = "mmc2";
                drive-strength = < 0x1e >;
                bias-pull-up;
                allwinner,drive = < 0x03 >;
                phandle = < 0x54 >;
            };
 
 
Sadly this wasn't enought, and I still can't see the eMMC.
 
I read a lot of threads, but I've not been able to find a solution.
I guess that I have some problems with the uBoot or with the drivers not present in the kernel.
 
I'm quite new to Linux, and I've never recompiled a kernel or a uBoot.
 
Please, can someone help me?
 
Thank you!