最简单的bootloader的编写步骤：

1. 初始化硬件：关看门狗、设置时钟、设置SDRAM、初始化NAND FLASH

2. 如果bootloader比较大，要把它重定位到SDRAM

3. 把内核从NAND FLASH读到SDRAM

4. 设置"要传给内核的参数"

5. 跳转执行内核

-The easiest the bootloader preparation steps: 1. Initializes the hardware: Off watchdog, set the clock, set the SDRAM initialization NAND FLASH If the bootloader is relatively large, to have it relocated to the SDRAM the kernel from read the NAND FLASH SDRAM 4. settings " parameters to be passed to the kernel. jumps execution cores