diff --git a/bsp/abstract-machine/extra.ld b/bsp/abstract-machine/extra.ld
index 38e4e13..abc2d15 100644
--- a/bsp/abstract-machine/extra.ld
+++ b/bsp/abstract-machine/extra.ld
@@ -2,6 +2,17 @@ SECTIONS {
   . = ALIGN(8);
 
   .myextra : {
+    /* section information for finsh shell */
+    . = ALIGN(8);
+    __fsymtab_start = .;
+    KEEP(*(FSymTab))
+    __fsymtab_end = .;
+    . = ALIGN(8);
+    __vsymtab_start = .;
+    KEEP(*(VSymTab))
+    __vsymtab_end = .;
+    . = ALIGN(8);
+
     /* section information for initial. */
     . = ALIGN(8);
     __rt_init_start = .;
diff --git a/bsp/abstract-machine/src/init.c b/bsp/abstract-machine/src/init.c
index 3121a5c..26fa5b9 100644
--- a/bsp/abstract-machine/src/init.c
+++ b/bsp/abstract-machine/src/init.c
@@ -1,9 +1,6 @@
 #include <am.h>
 #include <rtthread.h>
 
-void *__fsymtab_start = NULL;
-void *__fsymtab_end = NULL;
-
 #define RT_HW_HEAP_BEGIN heap.start
 #define RT_HW_HEAP_END heap.end