修复kconfig保存错误的问题

kconfig.cmake

@@ -8,7 +8,7 @@ message(
   ${CMAKE_SOURCE_DIR}/build/auto.conf "\n"
   ${CMAKE_SOURCE_DIR}/build/autoconf.h "\n"
   ${CMAKE_SOURCE_DIR}/build/log.txt "\n"
-  ${CMAKE_SOURCE_DIR}/build/.config "\n"
+  ${CMAKE_SOURCE_DIR}/.config "\n"
   )
 
 execute_process(
@@ -19,7 +19,7 @@ execute_process(
   ${CMAKE_SOURCE_DIR}/build/auto.conf 
   ${CMAKE_SOURCE_DIR}/build/autoconf.h 
   ${CMAKE_SOURCE_DIR}/build/log.txt 
-  ${CMAKE_SOURCE_DIR}/build/.config 
+  ${CMAKE_SOURCE_DIR}/.config 
   
   WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
   # The working directory is set to the app dir such that the user

mkrtos_user/server/drv/rtthread_drv/src/dfs_test.c

@@ -5,8 +5,10 @@
 #include <assert.h>
 void dfs_test(void)
 {
+    char data[5];
     int fd = open("/dev/uart2", O_RDWR, 0x777);
     assert(fd >= 0);
     write(fd, "1234\n", 5);
+    read(fd, data, 5);
     close(fd);
 }