how to boot from emmc on stm32mp157

[asadullah4571]

Hi 
i am struggling in how to boot from the EMMC not from the SD card , i used the custom board where my emmc is connected to SDMMC2 port , i did changes into the device tree i enable the sdmmc2, but i do not know how to boot from the emmc ?,
actually my custom board based on the (STM32MP157D -Dk1), there is no EMMC but in custom board i added the emmc with SDMMC2 channel, so please help me out this situation how to boot ,

please Ignor my basic question i am the frasher and doing own self, i need your support for learn.

[PatrickF]

Hi @asadullah4571 

did you set the BOOT pins to eMMC (b010)? Boot_device_selection_on_STM32MP1_series

see also Boot_from_e-MMC

Regards.

 

[asadullah4571]

hi @PatrickF ,

Actually, my boot1 pin is connected to the ground, it is always present as 0 as like (stm32mp157f-dk2),
i am attaching the custom board of bootpin, connection

 

 

 

[PatrickF]

Hi,

until you fix your PCB to have correct BOOT pins allowing to select the memory you implemented (there is no eMMC on STM32MP157x-DK board), you might have a solution using OTP3 primary_boot_source field to the value 3.

 

Regards,