# Prepare all needed software:
apt update
apt upgrade
apt install build-essential u-boot-tools libncurses5-dev git
# Note: For build kernel on regular PC - install cross-tools (for build kernel on device itself its not needed):
apt install gcc-5-cross-base

# Download latest Linux kernel sources (Stable branch for example):
git clone --depth 1 git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-stable

# Downoad kernel config
wget http://fox-exe.ru/WDMyCloud/Other/Official_linux_kernel/kernel.config -o linux-stable/.config

# Download DTS file for your device:
# WD MyCloud Mirror Gen1
wget http://fox-exe.ru/WDMyCloud/Other/Official_linux_kernel/armada-370-wdmc-mirror-gen1.dts -o linux-stable/arch/arm/boot/dts/
# WD MyCloud Mirror Gen2
wget http://fox-exe.ru/WDMyCloud/Other/Official_linux_kernel/armada-385-wdmc-mirror-gen2.dts -o linux-stable/arch/arm/boot/dts/
# WD MyCloud Gen2 (One disk, FW v2.xx)
wgethttp://fox-exe.ru/WDMyCloud/Other/Official_linux_kernel/armada-375-wdmc-gen2.dts -o linux-stable/arch/arm/boot/dts/
# WD MyCloud Ex2 Ultra
wgethttp://fox-exe.ru/WDMyCloud/Other/Official_linux_kernel/armada-385-wdmc-Ex2-Ultra.dts -o linux-stable/arch/arm/boot/dts/

# Lets start!
# Note: Do not set ARCH and CROSS_COMPILE vars if you build kernel on device itself.
# Note: Replace DTS_FILE to your device config (dts name w/o extension)
# Note: $DIR_RESULT - output path, where stored result (modules and kernel)
# Note: Replace "-j 4" to you processos core's count or remove for auto-detect.
export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabi-
export DIR_RESULT=../output
export DTS_FILE=armada-375-wdmc-gen2
mkdir -p $DIR_RESULT
cd linux-stable

# Check config for new/outdated/removed entries:
make -j 4 oldconfig

# Make changes in config via GUI, if you want yo add/remove something:
make -j 4 menuconfig

# Build kernel, modules and all other dependencies:
make -j 4 zImage
make -j 4 $DTS_FILE.dtb
make -j 4 modules
make -j 4 INSTALL_MOD_PATH=$DIR_RESULT modules_install
cat arch/arm/boot/zImage arch/arm/boot/dts/$DTS_FILE.dtb > zImage_and_dtb
mkimage -A arm -O linux -T kernel -C none -a 0x00008000 -e 0x00008000 -n $DTS_FILE -d zImage_and_dtb $DIR_RESULT/uImage
rm zImage_and_dtb

# Done! See result in $DIR_RESULT folder ("Output" by default)