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System boot mode hardware considerations

Question asked by Charles Miller on Aug 2, 2016
Latest reply on Aug 2, 2016 by Clive One
(This is a resend--the original didn't seem to get posted).

Is it advisable to pull-up pins participating in the system bootloader interfaces (USART1  & 2 for the F3)?  If floating, is it possible for the bootloader to "see" a spurious 0x7F, enable the wrong interface, and lock out the desired interface?