diff --git a/boards/ark/fmu-v6x/nuttx-config/nsh/defconfig b/boards/ark/fmu-v6x/nuttx-config/nsh/defconfig
index dac5f8dc15..17da75424e 100644
--- a/boards/ark/fmu-v6x/nuttx-config/nsh/defconfig
+++ b/boards/ark/fmu-v6x/nuttx-config/nsh/defconfig
@@ -295,12 +295,14 @@ CONFIG_UART5_IFLOWCONTROL=y
 CONFIG_UART5_OFLOWCONTROL=y
 CONFIG_UART5_RXDMA=y
 CONFIG_UART5_TXBUFSIZE=10000
+CONFIG_UART5_TXDMA=y
 CONFIG_UART7_BAUD=57600
 CONFIG_UART7_IFLOWCONTROL=y
 CONFIG_UART7_OFLOWCONTROL=y
 CONFIG_UART7_RXBUFSIZE=600
 CONFIG_UART7_RXDMA=y
 CONFIG_UART7_TXBUFSIZE=3000
+CONFIG_UART7_TXDMA=y
 CONFIG_UART8_BAUD=57600
 CONFIG_UART8_RXBUFSIZE=600
 CONFIG_UART8_TXBUFSIZE=1500
@@ -317,6 +319,7 @@ CONFIG_USART3_RXBUFSIZE=180
 CONFIG_USART3_RXDMA=y
 CONFIG_USART3_SERIAL_CONSOLE=y
 CONFIG_USART3_TXBUFSIZE=1500
+CONFIG_USART3_TXDMA=y
 CONFIG_USART6_BAUD=57600
 CONFIG_USART6_RXBUFSIZE=600
 CONFIG_USART6_TXBUFSIZE=1500