Kinsey Moore started a new discussion on bsps/arm/stm32f4/console/usart.c: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1141#note_146290

 >      /* Wait */
 >    }
 >  
 > -  usart->dr = STM32F4_USART_DR(c);
 > +  usart->dr = STM32F4_USART_DR(c & 0xFF);

This is 8-bit into 9-bit, so the mask here is unnecessary.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1141#note_146290
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