rpi3 and rpi4 native build

• Build rpi4 in native

  $ uname -r
  6.1.21-v8+
  mkdir rpi61_src/
  git clone  --depth=1 --branch rpi-6.1.y 
  (不能光sudo apt install raspberrypi-kernel-headers 在/usr/src下编译，会出错）
  cd linux
  >KERNEL=kernel8
  1）>make bcm2711_defconfig 
  	make -j4 Image.gz modules dtbs
  	
  sudo make modules_install
  (自动安装在/lib/modules，小心覆盖，这里我的为/lib/modules/6.1.53-v8+/，不会覆盖6.1.21-v8+)
  	
  
  覆盖，升级
  	sudo cp arch/arm64/boot/dts/broadcom/*.dtb /boot/
  	sudo cp arch/arm64/boot/dts/overlays/*.dtb* /boot/overlays/
  	sudo cp arch/arm64/boot/dts/overlays/README /boot/overlays/
  	sudo cp arch/arm64/boot/Image.gz /boot/$KERNEL.img
  
  修改安装目录：
  make ARCH=arm64 INSTALL_MOD_PATH=../ modules_install
  

• Build rpi3 in native

  ​
  apt install git bc bison flex libssl-dev make libc6-dev libncurses5-dev
  
  git clone --depth=1 --branch rpi-5.9.y https://github.com/raspberrypi/linux
  
  git clone git://github.com/raspberrypi/tools.git
  
  /home/pi/myrasp/linux>make bcm2709_defconfig（3B） (bcmrpi_defconfig 为早期版）
  
  /home/pi/myrasp/linux>make -j4 &
  
  ​
  KERNEL=kernel7
  make -j4 zImage modules dtbs
  sudo make modules_install
  (自动安装在/lib/modules，小心覆盖)
  
  sudo cp arch/arm/boot/dts/*.dtb /boot/
  sudo cp arch/arm/boot/dts/overlays/*.dtb* /boot/overlays/
  sudo cp arch/arm/boot/dts/overlays/README /boot/overlays/
  sudo cp arch/arm/boot/zImage /boot/$KERNEL.img