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What USARTs can be used for boot on 64-pin STM32F401RCT6 / STM32F401xB(C)

Question asked by Baxsie on Aug 10, 2016
Latest reply on Feb 17, 2017 by mret
On the 64-pin STM32F401RCT6 there are two USARTs:
  • USART1 on ports PA9 and PA10, pins 42 and 43
  • USART2 on ports PA2 and PA3, pins 16 and 17
I would think that either of these could be used by the bootloader, since the bootloader generally talks about USART1 and USART2.

However, AN2606 specifies that USART2 is on PD5/PD6 (correct for 100-pin package, there is no port D on 64-pin package).

So can USART2 be used for the serial bootloader in a 64-pin STM32F401RCT6 / STM32F401xB(C)  ?