What should I do to make a uImage of the kernel?

What should I do to make a uImage of the kernel?

I made following a uImage and I wrote it to a nand, but Redaynas don't start up.

[Summary of the ReadyNAS]

model: RN212
kernel: 4.4.190.alpine.1
firmware: 6.10.3

1) To install packages for compile.
sudo apt install gcc build-essential libncurses5-dev libncursesw5-dev bc

2) To download kernel source.
wget https://www.downloads.netgear.com/files/GPL/ReadyNASOS_V6.10.3_WW_src.zip

3) To unzip kernel source.
mkdir $HOME/ReadyNASOS_V6.10.3_WW_src
unzip ReadyNASOS_V6.10.3_WW_src.zip -d $HOME/ReadyNASOS_V6.10.3_WW_src

4) To make copy of the configuration file.
cd $HOME/ReadyNASOS_V6.10.3_WW_src/linux-4.4.190-alpine/
cp $HOME/ReadyNASOS_V6.10.3_WW_src/linux-4.4.190-arm/arch/arm/configs/readynas_defconfig .config

5) To edit following the configuration file.
[Before]
CONFIG_CROSS_COMPILE="arm-marvell-linux-gnueabi-"
CONFIG_LOCALVERSION=".armada.1"

[After]
CONFIG_CROSS_COMPILE=""
CONFIG_LOCALVERSION=".alpine.1"

6) To compile
make clean
make menuconfig ARCH=arm
make -j4 ARCH=arm
make -j4 uImage LOADADDR=0x200000 ARCH=arm
make -j4 modules ARCH=arm
make modules_install ARCH=arm

7) To write uImage
apt-get install mtd-utils
flash_erase /dev/mtd2 0 0
nandwrite -p /dev/mtd2 arch/arm/boot/uImage

I think the load address of a value is bad. What should I want the calculated value ?　It would be greatly appreciated if you could explain the details.