This PR sets the DMA configuration for the UART peripherals on the stm32f4 boards to the undef value to disable the DMA. This to prevent from accidentally configuring the DMA to stream 0 channel 0 when enabling DMA.
This PR sets the DMA configuration for the UART peripherals on the stm32f4 boards to the undef value to disable the DMA. This to prevent from accidentally configuring the DMA to stream 0 channel 0 when enabling DMA.