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STM32L4 bootloader port filtering ?

Question asked by Noyb on Sep 11, 2017
Latest reply on Sep 11, 2017 by Clive One

STM32L4, using internal bootloader, I can start it yet I need it not to open all available ports (usart, spi, usb) but limit it to only one dedicated uart port to avoid waking up chips linked to the other ports. Is there a way to filter ports before entering bootloader, like setting a register with bitfield to allow/disable certain ports ?