Modifying the U-boot

[hochul yoo]

Hi ~

I'm using STM32MP157C MPU with my custom board

and trying to modify u-boot for my board.

https://wiki.st.com/stm32mpu/wiki/How_to_cross-compile_with_the_Distribution_Package#Modifying_the_U-Boot

This wiki article has been describe about "Modifying the U-boot".

Adding simple log like the example works fine.

​But, If I try to change u-boot prompt string using "make menuconfig"

it seems like that changed prompt string didn't apply.

How to solve it?

Thanks.

[Kevin HUBER]

Hello @hochul yoo​ ,

I apologize for the delay in response.

Have you been able to solve your issue?

In your case, is it mandatory to use the Distribution Package?

Otherwise you can make a try with the Developer Package: https://wiki.st.com/stm32mpu/wiki/STM32MP1_Developer_Package#Installing_the_OpenSTLinux_BSP_packages

and

https://wiki.st.com/stm32mpu/wiki/How_to_cross-compile_with_the_Developer_Package#Modifying_the_U-Boot

Best Regards,

Kevin

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[MJahe.1 · Accepted solution]

Hi,

I work with it a few days ago with stm32mp1-openstlinux-5.15-yocto-kirkstone-mp1-v22.11.23 (zip file with kernel, FSBL, u-boot downloaded from ST)

1) Build standard configuration.

# my location of compiler
source /opt/st/OpenSTLinux/openstlinux-5.15-yocto-kirkstone-mp1-v22.11.23/environment-setup-cortexa7t2hf-neon-vfpv4-ostl-linux-gnueabi
 
cd u-boot-stm32mp-v2021.10-stm32mp-r2-r0/u-boot-stm32mp-v2021.10-stm32mp-r2
 
export FIP_DEPLOYDIR_ROOT=$PWD/../../FIP_artifacts
 
make -f $PWD/../Makefile.sdk UBOOT_CONFIG=trusted UBOOT_DEFCONFIG=stm32mp15_defconfig UBOOT_BINARY=u-boot.dtb DEVICETREE=stm32mp157c-dk2 all -j12

In directory build/stm32mp15_defconfig is .config file

2) copy it to main boot directory (../../u-boot-stm32mp-v2021.10-stm32mp-r2)

run

make menuconfig

modify configuration, write it.

3) copy .config to ../u-boot-stm32mp-v2021.10-stm32mp-r2/configs as yourconfiguration_defconfig

end of name _defconfig is important!

after that clean system with

make mrproper

and build your configuration with

make -f $PWD/../Makefile.sdk UBOOT_CONFIG=trusted UBOOT_DEFCONFIG=yourconfiguration_defconfig UBOOT_BINARY=u-boot.dtb DEVICETREE=stm32mp157c-dk2 all -j12

Michal Jahelka

[PatrickD]

Hi, 

To compelete the previous answer, you can also use savedefconfig to simplify your configuration, menuconfig   generate a very long .config.

$> make menuconfig   
$> make savedefconfig
$> cp defconfig to ../u-boot-stm32mp-v2021.10-stm32mp-r2/configs/<yourconfiguration>_defconfig

U-Boot use the Kconfig to configure its configuration,
But .config is overidde at each make command with Makefile.sdk, by using the content of defconfing directoty  (UBOOT_DEFCONFIG=yourconfiguration_defconfig)

https://wiki.st.com/stm32mpu/wiki/Menuconfig_or_how_to_configure_kernel

https://wiki.st.com/stm32mpu/wiki/U-Boot_overview#Kbuild

https://wiki.st.com/stm32mpu/wiki/How_to_configure_U-Boot_for_your_board#Defconfig

Patrick