U-boot root directory mkconfig File learning notes

In compiling the Zedboard u-boot.elf (SSBL), you know the steps to compile U-boot, and U-boot, which uses version 2014.4. Since the zc702 Development Board is now in use, you should compile the u-boot using the following command:

1. Make Zynq_zc70x_config

2. Make

The 1th and 2nd commands will execute the makefile file in the root directory, but the makefile file will determine if the make command is followed by a _config parameter. If you bring it, you will execute the mkconfig-a zynq_zc70x command. Otherwise, the large command that generates the U-boot.bin is executed.

Here Mkconfig did a few things:

1. Get the target board parameters from Boards.cfg and pass the parameters to 8 variables.

2. Do some folder links under/arch/arm/include/asm.

3. Generate Config.mk and Config.h files under the./include/directory.

#!/bin/sh-e

# Script to CreateHeader files and links to configure

# U-boot for aspecific board.

#

# parameters:target Architecture CPU Board [VENDOR] [SOC]

#

# (C) 2002-2013denx software Engineering, Wolfgang Denk <[email protected]>

#

#SPDX-license-identifier:gpl-2.0+

#

Append=no # default:create new config file

Board_name= "" # NAME to print on make output

Targets= ""

Arch= ""

Cpu= ""

Board= ""

Vendor= ""

Soc= ""

Options= ""

# The order we execute is Mkconfig–a zynq_zc70x, so $ #值为2, value is-A, the following conditions meet

if [\ ($#-eq 2\)-a \ ("$" = "-a" \)]; Then

# Automatic Mode

Line= ' awk ' ($!~/^#/&& $7 ~/^ ' "$ $" ' $/') {print $, $ $, $ $, $4, $ $, $6, $7, $8} ' $srctree/boards.cfg ' # Find the zynq_zc70x corresponding line in the board.cfg and pay the entire line value .

If [-Z "$line"]; Then #line variable to null indicates that the Target Board information was not found in the Boards.cfg

echo "MAKE: * * * No rule tomake target \ ' $2_config '. Stop. " >&2

Exit 1

Fi

Set ${line} #set用于在脚本内部给出其运行参数, so this time the script run parameter becomes the value of line: Active arm armv7 zynq Xilinx zynq Zy nq_zc70x-

# Add default board name if needed

[$# = 3] && set ${line} ${1}

Fi

# because we didn't pass it on to Mkconfig . any of the options, so while the code in the loop does not work.

While [$#-gt0]; Do

Case "$" in

--) shift; break;;

-a) shift; Append=yes;;

-N) Shift; Board_name= "${7%_config}"; shift;

-T) shift; Targets= "' Echo $ | Sed ' s:_:: G ' ${targets} '; shift;

*) break;;

Esac

Done

# The number of parameters is less 7 or greater than 8 exit, now the parameter is 8 , do not exit

[$#-lt 7]&& exit 1

[$#-gt 8]&& exit 1

#${7%_config} means to remove the _config suffix if $7 ends with the _config suffix. Because now $7=zynq_zc70x, so Config_name is waiting for zynq_zc70x

# Strip alloptions and/or _config suffixes

Config_name= "${7%_config}"

["${board_name}"] | | Board_name= "${7%_config}" #BOARD_NAME为 empty, so at this time board_name is also equal to zynq_zc70x .

Arch= "$" #arch =arm

Cpu= ' echo $ | awk ' BEGIN {FS = ': '}; {print '} ' #cpu =armv7

Spl_cpu= ' echo $ |awk ' BEGIN {FS = ': '}; {print $} ' #spl_cpu =armv7

If ["$cpu" = "-"]; Then

cpu=

Fi

["$6"! = "-"] && board= "$6" #board =zynq

["$ $" = "-"] && vendor= "$" #vendor =xilinx

["$4"! = "-"] && soc= "$4" #soc =zynq

#$8 to be "-" , do not execute code

[$#-gt 7]&& ["$8"! = "-"] && {

# Check if we have a board config name inthe options field

# The Options Field Mave has a boardconfig name and a list

# of options, both separated by a colon (': '); The options are

# Separated by commas (', ').

#

# Check for Board name

tmp= "${8%:*}"

If ["$tmp"]; Then

Config_name= "$tmp"

Fi

# Check If we have a colon ...

if ["${tmp}"! = "$8"]; Then

options=${8#*:}

Targets= "' Echo ${options} |sed ' s:,:: G ' ${targets}"

Fi

}

#如果ARCH已经有值了, then test whether arch and arch match. (Arch is now arch)

if ["${arch}"-A "${arch}"! = "${arch}"; Then

echo "Failed: \ $ARCH =${arch}, shouldbe ' ${arch} ' for ${board_name}" 1>&2

Exit 1

Fi

#

# Test aboveneeded aarch64, now we need arm

#

if ["${arch}" = "aarch64"]; Then

Arch= "Arm"

Fi

# at this Options is empty, so the output configuringfor zynq_zc70x Board ...

If ["$options"]; Then

echo "Configuring for ${board_name}-BOARD: ${config_name}, Options: ${options}"

Else

echo "Configuring for ${board_name}board ..."

Fi

#以下操作主要是创建一些文件夹链接

#KBUILD_SRC, the path values for Objtree and Srctree are performed in Makefile mkconfig-a zynq_zc70x Command was set before.

#kbuild_src is empty,Objtree, Srctree is the root directory path

#

# Create link Toarchitecture Specific headers

#

If [-N "$KBUILD _src"]; Then #KBUILd_src is empty, so go to the Else statement

Mkdir-p ${objtree}/include

lnprefix=${srctree}/arch/${arch}/include/asm/

CD ${objtree}/include

Mkdir-p ASM

Else

CD arch/${arch}/include #进入./arch/arm/include directory

Fi

Rm-f asm/arch #直接删除当前目录下asm/arch directory

if ["${soc}"]; Then #soc为zynq, enter the IF branch

Ln-s ${lnprefix}arch-${soc} asm/arch #将asm/arch link to arch-zynq directory, lnprefix= ""

elif ["${cpu}"]; Then

Ln-s ${LNPREFIX}ARCH-${CPU} asm/arch

Fi

If [-Z "$KBUILD _src"]; Then #KBUILD_SRC Empty, go to the root directory under the include directory

CD ${srctree}/include

Fi

#

# Create Includefile for Make

###################################################

After executing the following code, create the Config.mk file in the root include directory and write:

ARCH = Arm

CPU = ARMv7

BOARD = Zynq

VENDOR =xilinx

SOC = Zynq

###################################################

(echo "ARCH = ${arch}"

if [!-Z "$SPL _cpu"]; Then

Echo ' Ifeq ($ (config_spl_build), y) '

echo "CPU = ${spl_cpu}"

echo "Else"

echo "CPU = ${cpu}"

echo "EndIf"

Else

echo "CPU = ${cpu}"

Fi

echo "BOARD = ${board}"

["${vendor}"] && echo "vendor = ${vendor}"

["${soc}"] && echo "SOC = ${soc}"

Exit 0) >config.mk

# Assign boarddirectory to Boardir variable

If [-Z "${vendor}"]; Then #vendor不为空, go to the Else branch

Boarddir=${board}

Else

Boarddir=${vendor}/${board} #BOARDDIR =xilinx/zynq

Fi

#

# Create boardspecific Header file

#####################################################

after executing the following code, in the root directory include created under directory config.h file and write:

/*automatically generated-do not edit */

#defineCONFIG_SYS_ARCH "Arm"

#define CONFIG_SYS_CPU "ARMv7"

#defineCONFIG_SYS_BOARD "Zynq"

#defineCONFIG_SYS_VENDOR "Xilinx"

#defineCONFIG_SYS_SOC "Zynq"

#defineCONFIG_BOARDDIR Board/xilinx/zynq

#include <config_cmd_defaults.h>

#include <config_defaults.h>

#include <configs/zynq_zc70x.h>

#include <asm/config.h>

#include <config_fallbacks.h>

#include <config_uncmd_spl.h>

#####################################################

If ["$APPEND" = "yes"] #Append to existing config file

Then

Echo >> config.h

Else

> config.h # Create new config file

Fi

echo "/*automatically generated-do not edit */" >>config.h

For I in${targets}; Do

I= "' Echo ${i} | Sed '/=/{s/=//;q;}; {s/$/1/;} ' `"

echo "#define CONFIG_${I}" >>CONFIG.H;

Done

echo "#defineCONFIG_SYS_ARCH \" ${arch}\ "" >> config.h

echo "#defineCONFIG_SYS_CPU \" ${cpu}\ "" >> config.h

echo "#defineCONFIG_SYS_BOARD \" ${board}\ "" >> config.h

["${vendor}"] && echo "#define config_sys_vendor\" ${vendor}\ ">> config.h

["${soc}"] && echo "#define CONFIG_SYS_SOC \" ${soc}\ ">> config.h

["${board}"] && echo "#define CONFIG_BOARDDIR board/$BOARDDIR" >> config.h

#将输入的内容追加到config. h until an identity such as "EOF" appears.

Cat << eof>> Config.h

#include <config_cmd_defaults.h>

#include <config_defaults.h>

#include <configs/${CONFIG_NAME}.h>

#include <asm/config.h>

#include <config_fallbacks.h>

#include <config_uncmd_spl.h>

Eof

Exit 0

U-boot root directory mkconfig File learning notes