Marius Petcu 3e7efe5ef1 stm32: Add support for USART6 on STM32F401
STM32F401 has USART6 on PA12/PA11 and PC7/PC6 with alternate
function mapping AF08. This can be used, for example, to connect
to the Elegoo Neptune 3, where PA12/PA11 are wired to an RJ10 plug
going to the stock screen.

Signed-off-by: Marius Petcu <marius@petcu.me>
2025-03-07 17:52:46 -05:00
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