diff --git a/arch/nds32/include/asm/u-boot-nds32.h b/arch/nds32/include/asm/u-boot-nds32.h
index f3c7b27..d22eb5b 100644
--- a/arch/nds32/include/asm/u-boot-nds32.h
+++ b/arch/nds32/include/asm/u-boot-nds32.h
@@ -30,11 +30,6 @@
 #define _U_BOOT_NDS32_H_	1
 
 /* for the following variables, see start.S */
-extern char __bss_start[];	/* BSS start relative to _start */
-extern ulong __bss_end;		/* BSS end relative to _start */
-extern char _end[];		/* end of image relative to _start */
-extern void _start(void);	/* start of image relative to _start */
-extern ulong _TEXT_BASE;	/* code start */
 extern ulong IRQ_STACK_START;	/* top of IRQ stack */
 extern ulong FIQ_STACK_START;	/* top of FIQ stack */
 
diff --git a/arch/nds32/lib/board.c b/arch/nds32/lib/board.c
index 57af1be..1157d8c 100644
--- a/arch/nds32/lib/board.c
+++ b/arch/nds32/lib/board.c
@@ -36,6 +36,7 @@
 #include <nand.h>
 #include <onenand_uboot.h>
 #include <mmc.h>
+#include <asm/sections.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -300,7 +301,7 @@ void board_init_r(gd_t *id, ulong dest_addr)
 
 	gd->flags |= GD_FLG_RELOC;	/* tell others: relocation done */
 
-	monitor_flash_len = &_end - &_start;
+	monitor_flash_len = (ulong)&_end - (ulong)&_start;
 	debug("monitor flash len: %08lX\n", monitor_flash_len);
 
 	board_init();	/* Setup chipselects */