--- /dev/null
+choice
+ prompt "select usart type "
+ help
+ select usart type
+config USART_DW
+ bool "designware usart"
+ help
+ select the dw usart driver
+
+config USART_CK
+ bool "csky usart"
+ help
+ select the ck usart driver
+
+config USART_SILAN
+ bool "silan usart"
+ help
+ select the silan usart driver
+
+config USART_ZX29
+ bool "zx29 usart"
+ help
+ select the zx29 usart driver
+endchoice
+