S32G Uboot customization application doc

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目录 1 S32G Linux文档说明 .................................................. 3 2 创建S32G RDB2 Linux板级开发包编译环境 .............. 4 2.1 创建yocto编译环境: ................................................. 4 2.2 独立编译 ................................................................. 9 3 FSL Uboot 定制 ........................................................ 14 3.1 FDT支持 ............................................................... 14 3.2 DM(driver model)支持 ........................................... 20 3.3 Uboot目录结构 ...................................................... 31 3.4 Uboot编译 ............................................................. 34 3.5 Uboot初始化流程 .................................................. 35 3.6 使能了ATF后对Uboot初始化流程的影响 ............... 40 4 Uboot 定制 ............................................................... 41 4.1 修改 DDR大小 ....................................................... 41 4.2 修改调试串口与IOMUX说明 .................................. 44 4.3 DM I2C与PMIC初始化 .......................................... 53 4.4 通用GPIO ............................................................. 59 4.5 启动eMMC定制 ..................................................... 69 4.6 Ethernet定制 ......................................................... 78 5 Uboot debug信息 ..................................................... 89 5.1 Print env ............................................................... 89 5.2 dm - Driver model low level access ...................... 92 5.3 fdt .......................................................................... 95 5.4 I2C测试 ................................................................. 95 5.5 芯片寄存器访问 ..................................................... 98 updated to V5