CubieBoard Forum

I found this manual: http://linux-sunxi.org/Mainline_NAND_Howto but it seems outdated. "NAND detection/initialization patchset" cannot be applied to, say, https://git.kernel.org/cgit/linux/kernel/git/arm/arm-soc.git/ HEAD.
So I tried to fix dts and dtsi files and select  'Support for NAND on Allwinner SoCs' option in menuconfig, then got this:

# mtdinfo
Count of MTD devices:           0
# dmesg | tail
[    1.969324] EXT4-fs (mmcblk0): mounted filesystem with ordered data mode. Opts: (null)
[    1.977328] VFS: Mounted root (ext4 filesystem) readonly on device 179:0.
[    1.990871] devtmpfs: mounted
[    1.995363] Freeing unused kernel memory: 1024K (c0800000 - c0900000)
[    2.753005] systemd-udevd[163]: starting version 215
[    2.798861] random: udevd urandom read with 128 bits of entropy available
[    2.813133] random: nonblocking pool is initialized
[    5.326390] EXT4-fs (mmcblk0): re-mounted. Opts: (null)
[   11.839440] EXT4-fs (mmcblk0): re-mounted. Opts: commit=600,errors=remount-ro
[   13.521374] sunxi_nand 1c03000.nand: could not find pctldev for node /soc@01c00000/nand_base0@0, deferring probe


I just want to get the 4.7 kernel on Cubieboard's NAND.
I have a Cubieboard with installed Debian on Nand, which is mounted read-only.
I read https://linux-sunxi.org/Installing_to_NAND and learned that I should use " special allwinner version of u-boot".
I tried to build it but when I run
sudo make CROSS_COMPILE=arm-linux-gnueabihf-
I got the error:
In file included from /media/disk/progs/cubie/u-boot-sunxi/include/linux/compiler.h:40:0,
                 from cmd_version.c:27:
/media/disk/progs/cubie/u-boot-sunxi/include/linux/compiler-gcc.h:87:30: fatal error: linux/compiler-gcc6.h: No such file or directory
#include gcc_header(__GNUC__)

So I learned that I need gcc-4 but there is only gcc-6-arm-linux-gnueabihf and gcc-6-arm-linux-gnueabihf in the Debian Sid repository and I don't know how to get 4.
Then I tried to use crosstool-ng to build appropriate u-boot but only got another error.
So I decied to give up and use pre-installed stuff. I crosscompiled 4.7 kernel and tried to replace previous one with kexec.
I mounted an SD-card with the kernel and kexec-tools source code on it and build kexec-tools on Cubieboard.
Then I connected cubieboard to the UART and run
# ./kexec -l /home/cubie/Documents/uImage --dtb /home/cubie/Documents/sun4i-a10-cubieboard.dtb
# ./kexec -e
I saw this:
cubie@cubieboard:~$ <6>[sw-ohci2]: shutdown start
[sw-ohci2]: close clock
<6>[sw-ohci2]: shutdown end
<6>[sw-ehci2]: shutdown start
[sw-ehci2]: Set USB Power OFF
[sw-ehci2]: close clock
<6>[sw-ehci2]: shutdown end
<6>[sw-ohci1]: shutdown start
[sw-ohci1]: close clock
<6>[sw-ohci1]: shutdown end
<6>[sw-ehci1]: shutdown start
[sw-ehci1]: Set USB Power OFF
[sw-ehci1]: close clock
<6>[sw-ehci1]: shutdown end
wrn: hcd is disable, need not shutdown
[NAND]shutdown
nand try to shutdown 0 time
Nand flash shutdown ok!
<0>Starting new kernel
[  632.201177] Starting new kernel

Message from syslogd@localhost <6>Bye!
at Sep 26 05:12:59 ...
kernel

But now I have no idea what to do, what commands can I use (if any) and how to check if new kernel loaded successfully.

Please, help me.