diff --git a/m29f400bt.c b/m29f400bt.c
new file mode 100644
index 0000000..2011ceb
--- /dev/null
+++ b/m29f400bt.c
@@ -0,0 +1,180 @@
+/*
+ * m29f400bt.c: driver for programming JEDEC standard flash parts
+ *
+ *
+ * Copyright 2000 Silicon Integrated System Corporation
+ *
+ *	This program is free software; you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License as published by
+ *	the Free Software Foundation; either version 2 of the License, or
+ *	(at your option) any later version.
+ *
+ *	This program is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *	GNU General Public License for more details.
+ *
+ *	You should have received a copy of the GNU General Public License
+ *	along with this program; if not, write to the Free Software
+ *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * Reference:
+ *
+ * $Id$
+ */
+
+#include "flash.h"
+#include "m29f400bt.h"
+
+int probe_m29f400bt (struct flashchip * flash)
+{
+	volatile char * bios = flash->virt_addr;
+	unsigned char  id1, id2;
+
+	*(volatile char *) (bios + 0xAAA) = 0xAA;
+	*(volatile char *) (bios + 0x555) = 0x55;
+	*(volatile char *) (bios + 0xAAA) = 0x90;
+
+	myusec_delay(10);
+
+	id1 = *(volatile unsigned char *) bios;
+	id2 = *(volatile unsigned char *) (bios + 0x02);
+
+	*(volatile char *) (bios + 0xAAA) = 0xAA;
+	*(volatile char *) (bios + 0x555) = 0x55;
+	*(volatile char *) (bios + 0xAAA) = 0xF0;
+
+	myusec_delay(10);
+	
+	printf(__FUNCTION__ " id1 %x, id2 %x\n", id1, id2);
+	if (id1 == flash->manufacture_id && id2 == flash->model_id)
+		return 1;
+
+	return 0;
+}
+
+int erase_m29f400bt (struct flashchip * flash)
+{
+	volatile char * bios = flash->virt_addr;
+
+	*(volatile char *) (bios + 0xAAA) = 0xAA;
+	*(volatile char *) (bios + 0x555) = 0x55;
+	*(volatile char *) (bios + 0xAAA) = 0x80;
+
+	*(volatile char *) (bios + 0xAAA) = 0xAA;
+	*(volatile char *) (bios + 0x555) = 0x55;
+	*(volatile char *) (bios + 0xAAA) = 0x10;
+
+	myusec_delay(10);
+	toggle_ready_m29f400bt(bios);
+}
+
+int block_erase_m29f400bt (volatile char * bios ,volatile char * dst)
+{
+
+	*(volatile char *) (bios + 0xAAA) = 0xAA;
+	*(volatile char *) (bios + 0x555) = 0x55;
+	*(volatile char *) (bios + 0xAAA) = 0x80;
+
+	*(volatile char *) (bios + 0xAAA) = 0xAA;
+	*(volatile char *) (bios + 0x555) = 0x55;
+	//*(volatile char *) (bios + 0xAAA) = 0x10;
+	*dst  = 0x30;
+
+	myusec_delay(10);
+	toggle_ready_m29f400bt(bios);
+}
+
+int write_m29f400bt (struct flashchip * flash, char * buf)
+{
+	int i;
+	int total_size = flash->total_size *1024, page_size = flash->page_size;
+	volatile char * bios = flash->virt_addr;
+
+	//erase_m29f400bt (flash);
+	printf ("Programming Page:\n ");
+	/*********************************
+	*Pages for M29F400BT:
+	* 16	0x7c000		0x7ffff		TOP
+	*  8 	0x7a000		0x7bfff
+	*  8 	0x78000		0x79fff
+	* 32	0x70000		0x77fff
+	* 64	0x60000		0x6ffff
+	* 64	0x50000		0x5ffff
+	* 64	0x40000		0x4ffff
+	*---------------------------------
+	* 64	0x30000		0x3ffff
+	* 64	0x20000		0x2ffff
+	* 64	0x10000		0x1ffff
+	* 64	0x00000		0x0ffff		BOTTOM
+	*********************************/
+	printf("total_size/page_size = %d\n",total_size/page_size);
+	for (i = 0; i < (total_size/page_size)-1; i++) {
+		printf("%04d at address: 0x%08x\n", i, i * page_size);
+		block_erase_m29f400bt(bios, bios + i * page_size);
+		write_page_m29f400bt(bios, buf + i * page_size, bios + i * page_size,
+				 page_size);
+		printf ("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
+	}
+
+	printf("%04d at address: 0x%08x\n",7,0x70000);
+	block_erase_m29f400bt(bios , bios + 0x70000);
+	write_page_m29f400bt(bios,buf + 0x70000, bios + 0x70000, 32*1024);
+	
+	printf("%04d at address: 0x%08x\n",8,0x78000);
+	block_erase_m29f400bt(bios , bios + 0x78000);
+	write_page_m29f400bt(bios,buf + 0x78000, bios + 0x78000, 8*1024);
+	
+	printf("%04d at address: 0x%08x\n",9,0x7a000);
+	block_erase_m29f400bt(bios , bios + 0x7a000);
+	write_page_m29f400bt(bios,buf + 0x7a000, bios + 0x7a000, 8*1024);
+	
+	printf("%04d at address: 0x%08x\n",10,0x7c000);
+	block_erase_m29f400bt(bios , bios + 0x7c000);
+	write_page_m29f400bt(bios,buf + 0x7c000, bios + 0x7c000, 16*1024);
+	
+	printf("\n");
+	//protect_m29f400bt (bios);
+}
+
+int write_linuxbios_m29f400bt (struct flashchip * flash, char * buf)
+{
+	int i;
+	volatile char * bios = flash->virt_addr;
+
+	printf ("Programming Page:\n ");
+	/*********************************
+	*Pages for M29F400BT:
+	* 16	0x7c000		0x7ffff		TOP
+	*  8 	0x7a000		0x7bfff
+	*  8 	0x78000		0x79fff
+	* 32	0x70000		0x77fff
+	* 64	0x60000		0x6ffff
+	* 64	0x50000		0x5ffff
+	* 64	0x40000		0x4ffff
+	*---------------------------------
+	* 64	0x30000		0x3ffff
+	* 64	0x20000		0x2ffff
+	* 64	0x10000		0x1ffff
+	* 64	0x00000		0x0ffff		BOTTOM
+	*********************************/
+	printf("%04d at address: 0x%08x\n",7,0x00000);
+	block_erase_m29f400bt(bios , bios + 0x00000);
+	write_page_m29f400bt(bios,buf + 0x00000, bios + 0x00000, 64*1024);
+	
+	printf("%04d at address: 0x%08x\n",7,0x10000);
+	block_erase_m29f400bt(bios , bios + 0x10000);
+	write_page_m29f400bt(bios,buf + 0x10000, bios + 0x10000, 64*1024);
+	
+	printf("%04d at address: 0x%08x\n",7,0x20000);
+	block_erase_m29f400bt(bios , bios + 0x20000);
+	write_page_m29f400bt(bios,buf + 0x20000, bios + 0x20000, 64*1024);
+	
+	printf("%04d at address: 0x%08x\n",7,0x30000);
+	block_erase_m29f400bt(bios , bios + 0x30000);
+	write_page_m29f400bt(bios,buf + 0x30000, bios + 0x30000, 64*1024);
+	
+	printf("\n");
+	//protect_m29f400bt (bios);
+}
diff --git a/m29f400bt.h b/m29f400bt.h
new file mode 100644
index 0000000..a645870
--- /dev/null
+++ b/m29f400bt.h
@@ -0,0 +1,67 @@
+extern int probe_m29f400bt (struct flashchip * flash);
+extern int erase_m29f400bt (struct flashchip * flash);
+extern int block_erase_m29f400bt (volatile char * bios, volatile char * dst);
+extern int write_m29f400bt (struct flashchip * flash, char * buf);
+extern int write_linuxbios_m29f400bt (struct flashchip * flash, char * buf);
+
+extern __inline__ void toggle_ready_m29f400bt (volatile char * dst)
+{
+	unsigned int i = 0;
+	char tmp1, tmp2;
+
+	tmp1 = *dst & 0x40;
+
+	while (i++ < 0xFFFFFF) {
+		tmp2 = *dst & 0x40;
+		if (tmp1 == tmp2) {
+			break;
+		}
+		tmp1 = tmp2;
+	}
+}
+
+extern __inline__ void data_polling_m29f400bt (volatile char * dst, char data)
+{
+	unsigned int i = 0;
+	char tmp;
+
+	data &= 0x80;
+
+	while (i++ < 0xFFFFFF) {
+		tmp = *dst & 0x80;
+		if (tmp == data) {
+			break;
+		}
+	}
+}
+
+extern __inline__ void protect_m29f400bt (volatile char * bios)
+{
+	*(volatile char *) (bios + 0xAAA) = 0xAA;
+	*(volatile char *) (bios + 0x555) = 0x55;
+	*(volatile char *) (bios + 0xAAA) = 0xA0;
+
+	usleep(200);
+}
+
+extern __inline__ void write_page_m29f400bt (volatile char * bios, char * src, volatile char * dst,
+					 int page_size)
+{
+	int i;
+	
+	for (i = 0; i < page_size; i++) {
+		*(volatile char *) (bios + 0xAAA) = 0xAA;
+		*(volatile char *) (bios + 0x555) = 0x55;
+		*(volatile char *) (bios + 0xAAA) = 0xA0;
+
+		/* transfer data from source to destination */
+		*dst = *src;
+		//*(volatile char *) (bios) = 0xF0;
+		//usleep(5);
+		toggle_ready_m29f400bt(dst);
+		printf("Value in the flash at address %p = %#x, want %#x\n",dst-bios, *dst, *src);
+		dst++;
+		src++;
+	}
+
+}