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

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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/fixdepcc -Wp,-MD,scripts/basic/.fixdep.d -Iscripts/basic -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu11 -o scripts/basic/fixdep ../scripts/basic/fixdep.cGEN     ./Makefilerm -f .tmp_quiet_recordmcountln -fsn .. source/bin/bash ../scripts/mkmakefile \.. . 2021 01GEN     ./MakefileHOSTCC  scripts/kconfig/conf.occ -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.cYACC    scripts/kconfig/zconf.tab.cbison -oscripts/kconfig/zconf.tab.c -t -l ../scripts/kconfig/zconf.yLEX     scripts/kconfig/zconf.lex.cflex -oscripts/kconfig/zconf.lex.c -L ../scripts/kconfig/zconf.lHOSTCC  scripts/kconfig/zconf.tab.occ -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.cHOSTLD  scripts/kconfig/confcc   -o scripts/kconfig/conf scripts/kconfig/conf.o scripts/kconfig/zconf.tab.oscripts/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/fixdepgcc -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.ogcc -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.cHOSTCC  scripts/kconfig/confdata.ogcc -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.cHOSTCC  scripts/kconfig/expr.ogcc -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.cLEX     scripts/kconfig/lexer.lex.cflex -oscripts/kconfig/lexer.lex.c -L scripts/kconfig/lexer.lYACC    scripts/kconfig/parser.tab.[ch]bison -o scripts/kconfig/parser.tab.c --defines=scripts/kconfig/parser.tab.h -t -l scripts/kconfig/parser.yHOSTCC  scripts/kconfig/lexer.lex.ogcc -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.cHOSTCC  scripts/kconfig/parser.tab.ogcc -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.cHOSTCC  scripts/kconfig/preprocess.ogcc -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.cHOSTCC  scripts/kconfig/symbol.ogcc -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.cHOSTCC  scripts/kconfig/util.ogcc -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.cHOSTLD  scripts/kconfig/confgcc   -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.oscripts/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.olinux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