Author：AP0904225

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    阅读u-boot的README文档，可以获取很多有用的信息，例如从哪里可以获得帮助,帮助；u-boot版本命名规则，目录层次结构；软件配置，开发板初始化流程，配置选项，开发板的初始化设置，配置设置，硬件相关的配置选项；如何编译u-boot，环境变量，Image格式，Linux支持等等有关的信息。

    u-boot README文档信息主干结构不够清晰，各主题埋没在汪汪文字海洋中，因此特意整理了下u-boot EADME文档的主干结构，方便查找所需的信息。这个README是基于u-boot-2016.07版本整理的。

Summary

Status

    Where to get help

    Where to get source code

    Where we come from

    Names and Spelling

    Versioning

    Directory Hierarchy

    Software Configuration

    Selection of Processor Architecture and Board Type

    Sandbox Environment

   Board Initialisation Flow

        lowlevel_init():

         board_init_f():

         board_init_r():

    Configuration Options

Board initialization settings:

   Configuration Settings:

    Low Level (hardware related) configuration options:

    Freescale QE/FMAN Firmware Support:

    Freescale Layerscape Management Complex Firmware Support:

    Freescale Layerscape Debug Server Support:

    Reproducible builds

Building the Software:

    Testing of U-Boot Modifications, Ports to New Hardware, etc.

    Monitor Commands - Overview:

    Monitor Commands - Detailed Description

    Environment Variables

    Callback functions for environment variables

    Command Line Parsing

    Old, simple command line parser

    Hush shell

    General rules

    Note for Redundant Ethernet Interfaces

    Image Formats

    New uImage format (FIT)

    Old uImage format

Linux Support

Linux HOWTO

    Porting Linux to U-Boot based systems

    Configuring the Linux kernel

    Building a Linux Image

    Installing a Linux Image

    Boot Linux

    Boot Linux and pass a flat device tree

    More About U-Boot Image Types

    Booting the Linux zImage

Standalone HOWTO

Minicom warning

NetBSD Notes

Implementation Internals

    Initial Stack, Global Data

    Memory Management

    System Initialization

    U-Boot Porting Guide

    Coding Standards

    Submitting Patches