STM32MP157f-DK2 How to use external power supply?

[Sharan]

On DK2,  ADC is used to measure the voltage on cc lines, how to skip

can u give me the yocto steps to follow on commenting the following line in uBoot Device Tree:

do u have to create a new layer or can we edit the patch file in the uboot device tree and build it.

[Sharan]

https://wiki.st.com/stm32mpu/wiki/How_to_cross-compile_with_the_Distribution_Package                                              1)Go to the build directory

cd /home/sharan/STM32MPU/Distribution-Package/build-openstlinuxweston-stm32mp15-disco/tmp-glibc/work-shared/stm32mp15-disco/uboot-source/board/st/stm32mp1/

2)Start to work with u-boot

devtool modify u-boot-stm32mp

3)Edit the ./board/st/stm32mp1/stm32mp1.c source file
Add a log information in the checkboard function

 

4)Cross-compile the U-Boot

devtool build u-boot-stm32mp
bitbake u-boot-stm32mp -c deploy

5)if u want to modify again and the first modification                                                                                                           devtool reset u-boot-stm32mp # Wipe previous work if needed and repeat step 2 to 4                                                    

6)U-Boot are put on FIP image via TF-a fip generation

bitbake fip-stm32mp

7)Go to the directory in which the compilation results are stored

cd <build dir>/tmp-glibc/deploy/images/<machine name>/fip

8)Reboot the board, and hit any key to stop in the U-boot shell

reboot
[...]
Hit any key to stop autoboot: 0
STM32MP>

9)Connect a USB cable between the host machine and the board via the USB OTG ports

In the U-Boot shell, call the USB mass storage function

STM32MP> ums 0 mmc 0

10)Copy the binary (fip-<board name>-optee-<storage>.bin) to the dedicated partition

dd if=fip-<board name>-optee-<storage>.bin of=/dev/sdc5 bs=1M conv=fdatasync

(here fip-stm32mp157f-dk2-optee.bin for stm32mp15-disco machine)

11)Reset the U-Boot shell

STM32MP> reset

Have a look at the new U-Boot log information when the board reboots

[...]
U-Boot <U-Boot version>

CPU: STM32MP157FAC Rev.Z
Model: STMicroelectronics STM32MP157F-DK2 Discovery Board
Board: stm32mp1 in trusted mode (st,stm32mp157f-dk2)
U-Boot simple example
[...]