diff --git a/boards/px4/fmu-v4/nuttx-config/include/board_dma_map.h b/boards/px4/fmu-v4/nuttx-config/include/board_dma_map.h
index a5fec3cdb3..19437b769e 100644
--- a/boards/px4/fmu-v4/nuttx-config/include/board_dma_map.h
+++ b/boards/px4/fmu-v4/nuttx-config/include/board_dma_map.h
@@ -48,7 +48,7 @@
 |            |   TIM5_UP_1      |   TIM5_TRIG_1    |                  |   TIM5_TRIG_2    |                  |                  |                  |                  |
 | Channel 7  | -                | TIM6_UP          | I2C2_RX          | I2C2_RX_1        | USART3_TX_2      | DAC1             | DAC2             | I2C2_TX          |
 |            |                  |                  |                  |                  |                  |                  |                  |                  |
-| Usage      |                  | USART3_RX        | UART4_RX         | UART7_RX         |                  | USART2_RX        | TIM4_UP          |                  |
+| Usage      |                  | USART3_RX        | UART4_RX         | UART7_RX         | USART3_TX_2      | USART2_RX        | TIM4_UP          |                  |
 
 
 |    DMA2    | Stream 0         | Stream 1         | Stream 2         | Stream 3         | Stream 4         | Stream 5         | Stream 6         | Stream 7         |
@@ -76,6 +76,7 @@
 //      DMAMAP_USART3_RX                      // DMA1, Stream 1, Channel 4
 //      DMAMAP_UART4_RX                       // DMA1, Stream 2, Channel 4
 //      DMAMAP_UART7_RX                       // DMA1, Stream 3, Channel 5
+#define DMAMAP_USART3_TX  DMAMAP_USART3_TX_2  // DMA1, Stream 4, Channel 7    (TELEM2 TX)
 //      DMAMAP_USART2_RX                      // DMA1, Stream 5, Channel 4
 //      DMAMAP_TIM4_UP                        // DMA1, Stream 6, Channel 2    (DSHOT)
 
diff --git a/boards/px4/fmu-v4/nuttx-config/nsh/defconfig b/boards/px4/fmu-v4/nuttx-config/nsh/defconfig
index d49f0ab26e..1302c06297 100644
--- a/boards/px4/fmu-v4/nuttx-config/nsh/defconfig
+++ b/boards/px4/fmu-v4/nuttx-config/nsh/defconfig
@@ -237,6 +237,7 @@ CONFIG_USART3_OFLOWCONTROL=y
 CONFIG_USART3_RXBUFSIZE=1200
 CONFIG_USART3_RXDMA=y
 CONFIG_USART3_TXBUFSIZE=900
+CONFIG_USART3_TXDMA=y
 CONFIG_USART6_BAUD=57600
 CONFIG_USART6_RXBUFSIZE=300
 CONFIG_USART6_RXDMA=y
diff --git a/boards/px4/fmu-v4/nuttx-config/optimized/defconfig b/boards/px4/fmu-v4/nuttx-config/optimized/defconfig
index f72295e9bd..68cfd53c5c 100644
--- a/boards/px4/fmu-v4/nuttx-config/optimized/defconfig
+++ b/boards/px4/fmu-v4/nuttx-config/optimized/defconfig
@@ -238,6 +238,7 @@ CONFIG_USART3_OFLOWCONTROL=y
 CONFIG_USART3_RXBUFSIZE=1200
 CONFIG_USART3_RXDMA=y
 CONFIG_USART3_TXBUFSIZE=900
+CONFIG_USART3_TXDMA=y
 CONFIG_USART6_BAUD=57600
 CONFIG_USART6_RXBUFSIZE=300
 CONFIG_USART6_RXDMA=y
diff --git a/boards/px4/fmu-v4/nuttx-config/stackcheck/defconfig b/boards/px4/fmu-v4/nuttx-config/stackcheck/defconfig
index 19f1033a88..885f5674bb 100644
--- a/boards/px4/fmu-v4/nuttx-config/stackcheck/defconfig
+++ b/boards/px4/fmu-v4/nuttx-config/stackcheck/defconfig
@@ -238,6 +238,7 @@ CONFIG_USART3_OFLOWCONTROL=y
 CONFIG_USART3_RXBUFSIZE=1200
 CONFIG_USART3_RXDMA=y
 CONFIG_USART3_TXBUFSIZE=900
+CONFIG_USART3_TXDMA=y
 CONFIG_USART6_BAUD=57600
 CONFIG_USART6_RXBUFSIZE=300
 CONFIG_USART6_RXDMA=y