diff --git a/Targets/LS2K/dev/spi_w.c b/Targets/LS2K/dev/spi_w.c
index 58ae0a50..e7ee938a 100644
--- a/Targets/LS2K/dev/spi_w.c
+++ b/Targets/LS2K/dev/spi_w.c
@@ -459,7 +459,7 @@ int spi_erase_area(unsigned int saddr,unsigned int eaddr,unsigned sectorsize)
          * 0x52 erase 32kbyte of memory array
          * 0xd8 erase 64kbyte of memory array                                                                                                           
          */
-	SET_SPI(TXFIFO,0x20);
+	SET_SPI(TXFIFO,(sectorsize==0x1000?0x20:((sectorsize==0x8000)?0x52:0xd8)));
        	while((GET_SPI(SPSR))&RFEMPTY);
 	GET_SPI(RXFIFO);
 	SET_SPI(TXFIFO,addr >> 16);
@@ -544,7 +544,7 @@ int spi_read_area(int flashaddr,char *buffer,int size)
 struct fl_device myflash = {
 	.fl_name="spiflash",
 	.fl_size=0x100000,
-	.fl_secsize=0x10000,
+	.fl_secsize=FLASH_SECTOR_SIZE,
 };
 
 struct fl_device *fl_devident(void *base, struct fl_map **m)
@@ -572,7 +572,7 @@ int fl_erase_device(void *fl_base, int size, int verbose)
 	int off;
 	map = fl_find_map(fl_base);
 	off = (int)(fl_base - map->fl_map_base) + map->fl_map_offset;
-	spi_erase_area(off,off+size,0x1000);
+	spi_erase_area(off,off+size, myflash.fl_secsize);
 	spi_initr();
 return 0;
 }
diff --git a/Targets/LS2K/include/bonito.h b/Targets/LS2K/include/bonito.h
index 046273dc..a1f288db 100644
--- a/Targets/LS2K/include/bonito.h
+++ b/Targets/LS2K/include/bonito.h
@@ -69,6 +69,10 @@ struct pci_config_data {
 /*********************************************************************/
 /*nvram define                                                       */
 /*********************************************************************/
+#ifndef FLASH_SECTOR_SIZE
+#define FLASH_SECTOR_SIZE 0x1000
+#endif
+
 #ifdef NVRAM_IN_FLASH
 #	define	NVRAM_SIZE		492    /*modified by tangyt*/
 #	define	NVRAM_SECSIZE		500
@@ -77,7 +81,7 @@ struct pci_config_data {
 #ifdef BOOT_FROM_NAND
 #       define NVRAM_OFFS             0x000ffc00/*number 4 block*/
 #else
-#	define	NVRAM_OFFS		0x000ff000
+#	define	NVRAM_OFFS		(0x100000 - FLASH_SECTOR_SIZE)
 #endif
 #	define ETHER_OFFS		494 	/* Ethernet address base */
 #else	/* Use clock ram, 256 bytes only */
diff --git a/Targets/LS2K/include/load_dtb.h b/Targets/LS2K/include/load_dtb.h
index df3b9f81..b8e050e9 100644
--- a/Targets/LS2K/include/load_dtb.h
+++ b/Targets/LS2K/include/load_dtb.h
@@ -25,7 +25,7 @@ normal:	|-----bfc00000---|	dtb:	|-----bfc00000---|
 #include <ctype.h>
 
 #define	DTB_SIZE 0x4000		/* 16K dtb size*/
-#define	DTB_OFFS		(NVRAM_OFFS - DTB_SIZE)
+#define	DTB_OFFS		((NVRAM_OFFS - DTB_SIZE) & ~(FLASH_SECTOR_SIZE - 1))
 
 #define MAX_LEVEL	32		/* how deeply nested we will go */
 #define SCRATCHPAD      1024            /* bytes of scratchpad memory */