按照蜗窝科技的步骤执行
一、有关硬件描述的填空题
1）CPU上电后，从哪种设备（ BOOTROM ）的哪个地址（ 0x0000_0000 ）开始执行。
2）用（ ）方式，可以让CPU进入USB download（或者UART download）模式。 no
3）进入USB download之后，设备使用哪个USB接口（ ）和主机通信。no
4）进入download模式后，哪一段地址范围（通常为SRAM）可以用来执行程序：（ ）~（ ），size有多大（ ）。
5）用什么协议（ ）可以通过USB将bin文件上传到指定的地址。no
6）用什么协议（ ）可以让CPU跳转到到指定地址继续执行。no
二、基本符号的定义
Board -> ql10_demo
Vendor -> fmxx
Machine(SoC) -> fmql10
Arch -> arm
CPU -> armv7
三、目录结构及K从Kconfig的确定
1）在board/目录中创建“fmxx/ql10_demo” 目录，并提供Kconfig和Makefile文件
mkdir -p board/fmxx/ql10_demo
touch board/fmxx/ql10_demo/Kconfig
touch board/fmxx/ql10_demo/Makefile
2）在arch/arm/Kconfig中，添加配置菜单
config TARGET_QL10_DEMO
bool "Support fmxx ql10 demo board"
select CPU_V7A
select SUPPORT_SPL
select SPL
help
Support for ql10 demo board platform based on fmxx ql10 Psoc,
with 4xA7 CPU, 1GB DDR.
endchoice
source "board/fmxx/ql10_demo/Kconfig"
3）根据符号定义，在board/fmxx/ql10_demo/Kconfig中，添加如下配置项：
if TARGET_QL10_DEMO
config SYS_BOARD
default "ql10_demo"
config SYS_VENDOR
default "fmxx"
config SYS_SOC
default "fmql10"
config SYS_CONFIG_NAME
default "ql10_demo"
endif
vi doc/README.kconfig
以上README中有大致的流程
Conversion from boards.cfg to Kconfig
-------------------------------------
Prior to Kconfig, boards.cfg was a primary database that contained Arch, CPU,
SoC, etc. of all the supported boards. It was deleted when switching to
Kconfig. Each field of boards.cfg was converted as follows:
Status -> "S:" entry of MAINTAINERS
Arch -> CONFIG_SYS_ARCH defined by Kconfig
CPU -> CONFIG_SYS_CPU defined by Kconfig
SoC -> CONFIG_SYS_SOC defined by Kconfig
Vendor -> CONFIG_SYS_VENDOR defined by Kconfig
Board -> CONFIG_SYS_BOARD defined by Kconfig
Target -> File name of defconfig (configs/<target>_defconfig)
Options -> CONFIG_SYS_EXTRA_OPTIONS defined by Kconfig
Maintainers -> "M:" entry of MAINTAINERS
################# tips ####################
1.Arch arm
arch/arm/Kconfig中
config SYS_ARCH
default "arm"
2.CPU armv7
arch/arm/Kconfig
config SYS_CPU
default "armv7" if CPU_V7A
3.SoC fmql10
Define CONFIG_SYS_SOC="soc" to compile arch/<arch>/cpu/<cpu>/<soc> 其实并没有这个目录
4.Vendor fmxx
Define CONFIG_SYS_VENDOR="vendor" to compile board/<vendor>/common/*
and board/<vendor>/<board>/*
5.Board ql10_demo
Define CONFIG_SYS_BOARD="board" to compile board/<board>/*
(or board/<vendor>/<board>/* if CONFIG_SYS_VENDOR is defined)
6.Target ql10_demo
Define CONFIG_SYS_CONFIG_NAME="target" to include
include/configs/<target>.h
Add configs/<target>_defconfig
Tips to add/remove boards
-------------------------
When adding a new board, the following steps are generally needed:
[1] Add a header file include/configs/<target>.h
[2] Make sure to define necessary CONFIG_SYS_* in Kconfig:
Define CONFIG_SYS_CPU="cpu" to compile arch/<arch>/cpu/<cpu>
Define CONFIG_SYS_SOC="soc" to compile arch/<arch>/cpu/<cpu>/<soc>
Define CONFIG_SYS_VENDOR="vendor" to compile board/<vendor>/common/*
and board/<vendor>/<board>/*
Define CONFIG_SYS_BOARD="board" to compile board/<board>/*
(or board/<vendor>/<board>/* if CONFIG_SYS_VENDOR is defined)
Define CONFIG_SYS_CONFIG_NAME="target" to include
include/configs/<target>.h
[3] Add a new entry to the board select menu in Kconfig.
The board select menu is located in arch/<arch>/Kconfig or
arch/<arch>/*/Kconfig.
[4] Add a MAINTAINERS file
It is generally placed at board/<board>/MAINTAINERS or
board/<vendor>/<board>/MAINTAINERS
[5] Add configs/<target>_defconfig
When removing an obsolete board, the following steps are generally needed:
[1] Remove configs/<target>_defconfig
[2] Remove include/configs/<target>.h if it is not used by any other boards
[3] Remove board/<vendor>/<board>/* or board/<board>/* if it is not used
by any other boards
[4] Update MAINTAINERS if necessary
[5] Remove the unused entry from the board select menu in Kconfig
[6] Add an entry to doc/README.scrapyard
根据README的描述，定义上述配置项之后，u-boot会编译如下的目录：
Define CONFIG_SYS_CPU="cpu" to compile arch//cpu/
arch/arm/cpu/armv8
Q：并没有看到CONFIG_SYS_CPU的定义？
A：在“arm/Kconfig”中定义，“default "armv8" if ARM64”，这就是为什么在上面Target定义中“select ARM64”的原因。
Define CONFIG_SYS_SOC="soc" to compile arch//cpu//
arch/arm/cpu/armv8/s900
Q：如果该目录不存在，是否还会编译？
A：应该不会。
Define CONFIG_SYS_VENDOR="vendor" to compile board//common/* and board///*
board/actions/common/*
board/actions/bubblegum/*Define CONFIG_SYS_CONFIG_NAME="target" to include include/configs/.h
include/configs/bubblegum.h
4）创建该板子有关的配置头文件
include/configs/ql10_demo.h
#ifndef __QL10_DEMO_H
#define __QL10_DEMO_H
#endif
5）使用menuconfig，生成.config，并保存为ql10_demo_defconfig
cd ~/work/x_project/u-boot
make menuconfig
配置Architecture和Target：
Architecture select (ARM architecture) --->
ARM architecture --->
Target select (Support Bubblegum 96Board) --->
关闭Command line interface配置项下面所有的内容：
Command line interface --->
其它暂时用默认值，保存退出，得到.config文件，然后另存为ql10_demo_defconfig
cp .config configs/ql10_demo_defconfig