OK6410A 开发板 (三) 7 u-boot-2021.01 boot 解析 u-boot 与linux配置部分

U-boot配置

make O=output ok6410a_mini_defconfig

// 在配置的时候 不需要指定 ARCH(因为defconfig有写) 与 CROSS_COMPILE(因为现在并不需要,build的时候才需要)

// 如果写了CROSS_COMPILE,会去检查CROSS_COMPILE , 然后build的时候还是需要写

// 第一次用arm-gcc 的时刻, 编译时 的 CC      lib/asm-offsets.s

make[1]: Entering directory '/home/suws/ok6410/system-new/u-boot/output'

  HOSTCC  scripts/basic/fixdep

  cc -Wp,-MD,scripts/basic/.fixdep.d -Iscripts/basic -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu11 -o scripts/basic/fixdep ../scripts/basic/fixdep.c

  GEN     ./Makefile

rm -f .tmp_quiet_recordmcount

ln -fsn .. source

/bin/bash ../scripts/mkmakefile

    .. . 2021 01

  GEN     ./Makefile

  HOSTCC  scripts/kconfig/conf.o

  cc -Wp,-MD,scripts/kconfig/.conf.o.d -Iscripts/kconfig -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu11 -c -o scripts/kconfig/conf.o ../scripts/kconfig/conf.c

  YACC    scripts/kconfig/zconf.tab.c

  bison -oscripts/kconfig/zconf.tab.c -t -l ../scripts/kconfig/zconf.y

  LEX     scripts/kconfig/zconf.lex.c

  flex -oscripts/kconfig/zconf.lex.c -L ../scripts/kconfig/zconf.l

  HOSTCC  scripts/kconfig/zconf.tab.o

  cc -Wp,-MD,scripts/kconfig/.zconf.tab.o.d -Iscripts/kconfig -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu11  -I../scripts/kconfig -c -o scripts/kconfig/zconf.tab.o scripts/kconfig/zconf.tab.c

  HOSTLD  scripts/kconfig/conf

  cc   -o scripts/kconfig/conf scripts/kconfig/conf.o scripts/kconfig/zconf.tab.o

scripts/kconfig/conf  --defconfig=arch/../configs/ok6410a_mini_defconfig Kconfig

#

# configuration written to .config

#

make[1]: Leaving directory '/home/suws/ok6410/system-new/u-boot/output'

linux配置

  HOSTCC  scripts/basic/fixdep

  gcc -Wp,-MMD,scripts/basic/.fixdep.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89         -o scripts/basic/fixdep scripts/basic/fixdep.c 

  HOSTCC  scripts/kconfig/conf.o

  gcc -Wp,-MMD,scripts/kconfig/.conf.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89       -c -o scripts/kconfig/conf.o scripts/kconfig/conf.c

  HOSTCC  scripts/kconfig/confdata.o

  gcc -Wp,-MMD,scripts/kconfig/.confdata.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89       -c -o scripts/kconfig/confdata.o scripts/kconfig/confdata.c

  HOSTCC  scripts/kconfig/expr.o

  gcc -Wp,-MMD,scripts/kconfig/.expr.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89       -c -o scripts/kconfig/expr.o scripts/kconfig/expr.c

  LEX     scripts/kconfig/lexer.lex.c

  flex -oscripts/kconfig/lexer.lex.c -L scripts/kconfig/lexer.l

  YACC    scripts/kconfig/parser.tab.[ch]

  bison -o scripts/kconfig/parser.tab.c --defines=scripts/kconfig/parser.tab.h -t -l scripts/kconfig/parser.y

  HOSTCC  scripts/kconfig/lexer.lex.o

  gcc -Wp,-MMD,scripts/kconfig/.lexer.lex.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89      -I ./scripts/kconfig -c -o scripts/kconfig/lexer.lex.o scripts/kconfig/lexer.lex.c

  HOSTCC  scripts/kconfig/parser.tab.o

  gcc -Wp,-MMD,scripts/kconfig/.parser.tab.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89      -I ./scripts/kconfig -c -o scripts/kconfig/parser.tab.o scripts/kconfig/parser.tab.c

  HOSTCC  scripts/kconfig/preprocess.o

  gcc -Wp,-MMD,scripts/kconfig/.preprocess.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89       -c -o scripts/kconfig/preprocess.o scripts/kconfig/preprocess.c

  HOSTCC  scripts/kconfig/symbol.o

  gcc -Wp,-MMD,scripts/kconfig/.symbol.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89       -c -o scripts/kconfig/symbol.o scripts/kconfig/symbol.c

  HOSTCC  scripts/kconfig/util.o

  gcc -Wp,-MMD,scripts/kconfig/.util.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89       -c -o scripts/kconfig/util.o scripts/kconfig/util.c

  HOSTLD  scripts/kconfig/conf

  gcc   -o scripts/kconfig/conf scripts/kconfig/conf.o scripts/kconfig/confdata.o scripts/kconfig/expr.o scripts/kconfig/lexer.lex.o scripts/kconfig/parser.tab.o scripts/kconfig/preprocess.o scripts/kconfig/symbol.o scripts/kconfig/util.o

scripts/kconfig/conf  --defconfig=arch/arm/configs/ok6410A_sdboot_mini_defconfig Kconfig

#

# configuration written to .config

#

u-boot 和 linux 配置 的区别

配置需要填充的环境变量

u-boot 配置不需要填充 ARCH 与 CROSS_COMPILE 

u-boot 编译需要配置  CROSS_COMPILE

linux 配置需要填充 ARCH(这样才能找到defconfig) 与 CROSS_COMPILE (填充后会改变生成的.config,.config中会填充CROSS_COMPILE 的信息CONFIG_CC_VERSION_TEXT)

linux 编译也需要配置 ARCH 与 CROSS_COMPILE 

配置运行过程

相同点:

都是生成 scripts/kconfig/conf

并用命令 scripts/kconfig/conf  --defconfig=/path_to_defconfig/ok6410a_mini_defconfig Kconfig 生成 .config

不同点

u-boot 的 scripts/kconfig/conf 比较简单 

cc   -o scripts/kconfig/conf scripts/kconfig/conf.o scripts/kconfig/zconf.tab.o

linux的 scripts/kconfig/conf 比较复杂

  gcc   -o scripts/kconfig/conf scripts/kconfig/conf.o scripts/kconfig/confdata.o scripts/kconfig/expr.o scripts/kconfig/lexer.lex.o scripts/kconfig/parser.tab.o scripts/kconfig/preprocess.o scripts/kconfig/symbol.o scripts/kconfig/util.o