Error in "Prepare the Linux® kernel source code"

[Sisyphus38]

Hello,

I tried to apply the step by step "Modify, rebuild and reload the Linux® kernel" form wiki.st .

https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP1_boards/STM32MP157x-DK2/Develop_on_Arm%C2%AE_Cortex%C2%AE-A7/Modify,_rebuild_and_reload_the_Linux%C2%AE_kernel

Everything works fine from the first step of the "Getting started " until i uncoutered the error bellow.

Unfortunately i am a complete beginner on these tools and don't understand whats happen.

Thank you by advance for any help.

@PC:~/STM32MPU_workspace/STM32MP15-Ecosystem-v2.0.0/Developer-Package/stm32mp1-openstlinux-5.4-dunfell-mp1-20-06-24/sources/arm-ostl-linux-gnueabi/linux-stm32mp-5.4.31-r0/linux-5.4.31$ make ARCH=arm multi_v7_defconfig "fragment*.config"

 HOSTCC scripts/basic/fixdep

 HOSTCC scripts/kconfig/conf.o

 HOSTCC scripts/kconfig/confdata.o

 HOSTCC scripts/kconfig/expr.o

 LEX    scripts/kconfig/lexer.lex.c

/bin/sh: 1: flex: not found

scripts/Makefile.host:9: recipe for target 'scripts/kconfig/lexer.lex.c' failed

make[2]: *** [scripts/kconfig/lexer.lex.c] Error 127

Makefile:567: recipe for target 'multi_v7_defconfig' failed

make[1]: *** [multi_v7_defconfig] Error 2

Makefile:326: recipe for target '__build_one_by_one' failed

make: *** [__build_one_by_one] Error 2

[AlexandrShipovsky]

Did you manage to solve the problem?

[MSele.1]

This part of modifying the kernel did not work, so I decided to ignore it.

[AlexandrShipovsky]

@MSele.1​ How did you solve the problem with "xargs: unrecognized option --strip-debug"? I just increased the size of the rootfs partition and loaded all the kernel modules without reducing their size. It works, but it doesn't seem to be the best solution.