STM32MP151 in USB/UART boot mode after reboot

[Ma_mh1]

Hello,

We are using the STM32MP151 custom board microprocessor with an external flash memory (emmc). At start-up the board and linux boot correctly, but when reboot it, the board keeps in uart/usb boot loader mode and doesn't boot. It happen also when we reboot with a push button in rst pin and with software reboot.

When we reboot in software reboot, the last traces we get are:

Could you help us? Thanks.

Regards.

[PatrickF]

HI @Ma_mh1 

Maybe you are using power discrete (no STPMIC1) and you do not connect correctly the NRST_CORE pin (see AN5031 or ES0438)

If not the root cause, dump and analyze ROM boot traces using STLINK : https://wiki.st.com/stm32mpu/wiki/STM32_MPU_ROM_trace_analyzer ?

Regards.