Upgrade CM5's miniloader and uboot using the dd command

[george]

• When the coolpi-kernel is synchronized to the latest compiled and updated kernel, the system will display a device node of /dev/mtdblock0.
  

• Synchronize the coolpi-loader code to the latest version, switch to the develop branch, compile and generate cm5-notebook-nor-upgrade. img
  

• Use the following command to update:

  sudo dd if=/**/cm5-notebook-nor-upgrade.img of=/dev/mtdblock0 bs=1k count=8192

• You can also directly use the Disk Image Writer built-in in the Ubuntu system to update
  

[berkaroad]

在x86机器上的docker环境 ubuntu:20.04 下可以构建成功。arm 笔记本上发现最后一步不形，估计是使用的工具有x86下的二进制文件.

apt install build-essential device-tree-compiler bc python2

./build-loader.sh cm5-notebook