[更新]：更新kconfig,去除不必要的配置项。

bsp/stm32f429-apollo/KConfig

+mainmenu "RT-Thread Configuration"
+
+config $BSP_DIR
+    string
+    option env="BSP_ROOT"
+    default "."
+
+config $RTT_DIR
+    string
+    option env="RTT_ROOT"
+    default "../.."
+
+config $PKGS_DIR
+    string
+    option env="PKGS_ROOT"
+    default "packages"
+
+source "$RTT_DIR/KConfig"
+source "$PKGS_DIR/KConfig"
+
+menu "BSP_SPECIAL CONFIG"
+  
+config RT_RTC_NAME
+    string "RT_RTC_NAME"
+    default rtc
+    
+config RT_USING_EXT_SDRAM
+    bool "Using RT_USING_EXT_SDRAM"
+    default y
+ 
+config RT_USING_UART1
+    bool "Using RT_USING_UART1"
+    default y    
+    
+config RT_USING_UART2
+    bool "Using RT_USING_UART2"
+    default y    
+    
+config RT_USING_UART3
+    bool "Using RT_USING_UART3"
+    default y  
+    
+config RT_USING_SPI5
+    bool "Using RT_USING_SPI5"
+    default y     
+          
+endmenu
+
+
+
+    
+    
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