OK6410A development board (three) 7 u-boot-2021.01 boot analysis u-boot and linux configuration part

U-boot configuration

make O=output ok6410a_mini_defconfig

// You don't need to specify ARCH (because it's written in defconfig) and CROSS_COMPILE (because it's not needed now, it's needed when building) when configuring

// If CROSS_COMPILE is written, CROSS_COMPILE will be checked, and then it still needs to be written when building

// The first time using arm-gcc, CC lib/asm-offsets.s during compilation

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 configuration

  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

#

Differences between u-boot and linux configuration

Configure the environment variables that need to be filled

u-boot configuration does not need to fill ARCH and CROSS_COMPILE 

u-boot compilation requires configuration of CROSS_COMPILE

The linux configuration needs to fill in ARCH (so that defconfig can be found) and CROSS_COMPILE (filling will change the generated .config, and the .config will be filled with the CROSS_COMPILE information CONFIG_CC_VERSION_TEXT)

Linux compilation also requires configuration of ARCH and CROSS_COMPILE 

Configuration run process

Same point:

All generate scripts/kconfig/conf

And use the command scripts/kconfig/conf --defconfig=/path_to_defconfig/ok6410a_mini_defconfig Kconfig to generate .config

difference

u-boot scripts/kconfig/conf is relatively simple 

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

Linux scripts/kconfig/conf is more complicated

  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