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In Engineering mode (BOOT0 off and BOOT2 on), only the Cortex-M4 core is running. It means that all clocks have to be setup by the Cortex-M4 core. In other modes, the clocks are setup by the Cortex-A7 and then should not be setup by Cortex-M4. stm32mp1_eng_mode pseudomodule have to be used in Engineering mode to ensure clocks configuration with IS_USED(MODULE_STM32MP1_ENG_MODE) macro. This macro can also be used in periph_conf.h to define clock source for each peripheral. Signed-off-by: Gilles DOFFE <gilles.doffe@savoirfairelinux.com>