Let's rename board_driver_initialize() to board_early_initialize() to emphasize its relationship to board_late_initialize().

sched/init/nx_start.c

@@ -45,6 +45,7 @@
 #include <debug.h>
 
 #include <nuttx/arch.h>
+#include <nuttx/board.h>
 #include <nuttx/compiler.h>
 #include <nuttx/sched.h>
 #include <nuttx/fs/fs.h>
@@ -718,16 +719,16 @@ void nx_start(void)
 
   up_initialize();
 
-#ifdef CONFIG_BOARD_DRIVER_INITIALIZE
+#ifdef CONFIG_BOARD_EARLY_INITIALIZE
   /* Call the board-specific up_initialize() extension to support
    * early initialization of board-specific drivers and resources
    * that cannot wait until board_late_initialize.
    */
 
-  board_driver_initialize();
+  board_early_initialize();
 #endif
 
-  /* Hardware resources are available */
+  /* Hardware resources are now available */
 
   g_nx_initstate = OSINIT_HARDWARE;