diff --git a/flash.h b/flash.h
index 0e62b89..ace46a4 100644
--- a/flash.h
+++ b/flash.h
@@ -37,6 +37,9 @@
 #define SST_39SF020       0xB6    /* SST 39SF020  device        */
 #define SST_39VF020       0xD6    /* SST 39SF020  device        */
 
+#define PMC_ID            0x9D  /* PMC Manufacturer ID[B code   */
+#define PMC_49FL004       0x6E  /* PMC 49FL004 device code      */
+
 #define WINBOND_ID        0xDA	/* Winbond Manufacture ID code	*/
 #define W_29C011          0xC1	/* Winbond w29c011 device code*/
 #define W_29C020C         0x45	/* Winbond w29c020c device code*/
diff --git a/flash_rom.c b/flash_rom.c
index a13d48b..b063b3c 100644
--- a/flash_rom.c
+++ b/flash_rom.c
@@ -46,10 +46,12 @@
 #include "sst28sf040.h"
 #include "w49f002u.h"
 #include "sst39sf020.h"
+#include "pm49fl004.h"
 #include "mx29f002.h"
 
 struct flashchip flashchips[] = {
-    {"Am29F040B",   AMD_ID,     AM_29F040B,   NULL, 512, 64*1024,
+#if  1
+   {"Am29F040B",   AMD_ID,     AM_29F040B,   NULL, 512, 64*1024,
      probe_29f040b, erase_29f040b, write_29f040b, NULL},
     {"At29C040A",   ATMEL_ID,   AT_29C040A,   NULL, 512, 256,
      probe_jedec,   erase_jedec,   write_jedec, NULL},
@@ -63,6 +65,12 @@
      probe_39sf020, erase_39sf020, write_39sf020, NULL},
     {"SST39VF020",  SST_ID,     SST_39VF020,  NULL, 256, 4096,
      probe_39sf020, erase_39sf020, write_39sf020, NULL},
+#endif
+//By LYH begin
+    {"Pm49FL004",  PMC_ID,     PMC_49FL004,  NULL, 512, 64*1024,
+     probe_49fl004, erase_49fl004, write_49fl004, NULL},
+//END
+#if 1
     {"W29C011",    WINBOND_ID, W_29C011,    NULL, 128, 128,
      probe_jedec,   erase_jedec,   write_jedec, NULL},
     {"W29C020C",    WINBOND_ID, W_29C020C,    NULL, 256, 128,
@@ -80,10 +88,11 @@
      NULL, 8, 8*1024,
      probe_md2802, erase_md2802, write_md2802, read_md2802},
     {NULL,}
+#endif
 };
 
 char *chip_to_probe = NULL;
-
+#if 1
 int enable_flash_sis630 (struct pci_dev *dev, char *name)
 {
     char b;
@@ -271,6 +280,71 @@
   }
   return 0;
 }
+#endif
+//BY LYH
+#if 0
+static void dump_pci_device(struct pci_dev *dev)
+{
+        int i;
+
+	printf("\n");
+        for(i = 0; i <= 255; i++) {
+                unsigned char val;
+                if ((i & 0x0f) == 0) {
+                        printf("0x%02x:",i);
+                }
+                val = pci_read_byte(dev, i);
+		printf(" 0x%02x",val);
+                if ((i & 0x0f) == 0x0f) {
+                        printf("\r\n");
+                }
+        }
+}
+
+#endif
+
+int
+enable_flash_amd8111(struct pci_dev *dev, char *name) {
+  /* register 4e.b gets or'ed with one */
+  unsigned char old, new;
+  /* if it fails, it fails. There are so many variations of broken mobos
+   * that it is hard to argue that we should quit at this point. 
+   */
+
+//  dump_pci_device(dev); 
+ 
+  old = pci_read_byte(dev, 0x43);
+
+  new = old | 0x80;
+
+  if (new != old) {
+
+  	pci_write_byte(dev, 0x43, new);
+
+  	if (pci_read_byte(dev, 0x43) != new) {
+    		printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n",
+          	 0x43, new, name);
+  	}
+  }
+
+	
+  old = pci_read_byte(dev, 0x40);
+  
+  new = old | 0x01;
+  
+  if (new == old)
+      return 0;
+      
+  pci_write_byte(dev, 0x40, new);
+  
+  if (pci_read_byte(dev, 0x40) != new) {
+    printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n",
+           0x40, new, name);
+    return -1;
+  }
+  return 0;
+}
+//By LYH END
 
 struct flashchip * probe_flash(struct flashchip * flash)
 {
@@ -299,7 +373,7 @@
 	 		flash->total_size * 1024, (unsigned long)size);
 	}
 	bios = mmap (0, size, PROT_WRITE | PROT_READ, MAP_SHARED,
-		     fd_mem, (off_t) (0 - size));
+		     fd_mem, (off_t) (0-size));
 	if (bios == MAP_FAILED) {
 	    perror("Error MMAP /dev/mem");
 	    exit(1);
@@ -393,7 +467,7 @@
 } FLASH_ENABLE;
 
 FLASH_ENABLE enables[] = {
-
+#if 1
   {0x1, 0x1, "sis630 -- what's the ID?", enable_flash_sis630},
   {0x8086, 0x2480, "E7500", enable_flash_e7500},
   {0x1106, 0x8231, "VT8231", enable_flash_vt8231},
@@ -401,6 +475,8 @@
   {0x1078, 0x0100, "CS5530", enable_flash_cs5530},
   {0x100b, 0x0510, "SC1100", enable_flash_sc1100},
   {0x1039, 0x8, "SIS5595", enable_flash_sis5595},
+#endif
+  {0x1022, 0x7468, "AMD8111", enable_flash_amd8111},
 };
   
 int
diff --git a/pm49fl004.c b/pm49fl004.c
new file mode 100644
index 0000000..7fcb3ee
--- /dev/null
+++ b/pm49fl004.c
@@ -0,0 +1,210 @@
+/*
+ * pm49fl004.c: driver for Pm49FL004 flash models.
+ *
+ *
+ * Copyright 2004 Tyan 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.
+ *
+ *
+ */
+
+#include <stdio.h>
+#include "flash.h"
+#include "jedec.h"
+#include "pm49fl004.h"
+
+#define AUTO_PGRM		0x10
+#define CHIP_ERASE		0x30
+#define RESET			0xFF
+#define READ_ID			0x90
+
+static __inline__ void protect_49fl004 (volatile char * bios)
+{
+	/* ask compiler not to optimize this */
+	volatile unsigned char tmp;
+
+	tmp = *(volatile unsigned char *) (bios + 0x1823);
+	tmp = *(volatile unsigned char *) (bios + 0x1820);
+	tmp = *(volatile unsigned char *) (bios + 0x1822);
+	tmp = *(volatile unsigned char *) (bios + 0x0418);
+	tmp = *(volatile unsigned char *) (bios + 0x041B);
+	tmp = *(volatile unsigned char *) (bios + 0x0419);
+	tmp = *(volatile unsigned char *) (bios + 0x040A);
+}
+
+static __inline__ void unprotect_49fl004 (volatile char * bios)
+{
+	/* ask compiler not to optimize this */
+	volatile unsigned char tmp;
+
+	tmp = *(volatile unsigned char *) (bios + 0x1823);
+	tmp = *(volatile unsigned char *) (bios + 0x1820);
+	tmp = *(volatile unsigned char *) (bios + 0x1822);
+	tmp = *(volatile unsigned char *) (bios + 0x0418);
+	tmp = *(volatile unsigned char *) (bios + 0x041B);
+	tmp = *(volatile unsigned char *) (bios + 0x0419);
+	tmp = *(volatile unsigned char *) (bios + 0x041A);
+}
+
+static __inline__ int erase_block_49fl004 ( volatile unsigned char * bios ,unsigned long address) 
+{
+        volatile unsigned char *Temp;
+
+        Temp  = bios + 0x5555; /* set up address to be C000:5555h      */
+        *Temp = 0xAA;            /* write data 0xAA to the address       */
+        myusec_delay(10);
+        Temp  = bios + 0x2AAA; /* set up address to be C000:2AAAh      */
+        *Temp = 0x55;         /* write data 0x55 to the address       */
+        myusec_delay(10);
+        Temp  = bios + 0x5555; /* set up address to be C000:5555h      */
+        *Temp = 0x80;            /* write data 0x80 to the address       */
+        myusec_delay(10);
+        Temp  = bios + 0x5555; /* set up address to be C000:5555h      */
+        *Temp = 0xAA;         /* write data 0xAA to the address       */
+        myusec_delay(10);
+        Temp  = bios + 0x2AAA; /* set up address to be C000:2AAAh      */
+        *Temp = 0x55;          /* write data 0x55 to the address       */
+        myusec_delay(10);
+        Temp  = bios + address; /* set up address to be C000:5555h      */
+        *Temp = 0x50;       /* write data 0x55 to the address       */
+
+	/* wait for Toggle bit ready         */
+        toggle_ready_jedec(bios);
+
+        return(0);
+}
+static __inline__ int write_block_49fl004(volatile char * bios, 
+				       unsigned char * src,
+				       volatile unsigned char * dst, 
+				       unsigned int page_size)
+{
+	int i;
+	volatile char *Temp;
+
+	for (i = 0; i < page_size; i++) {
+		if (*dst != 0xff) {
+			printf("FATAL: dst %p not erased (val 0x%x\n", dst, *dst);
+			return(-1);
+		}
+		/* transfer data from source to destination */
+		if (*src == 0xFF) {
+			dst++, src++;
+			/* If the data is 0xFF, don't program it */
+			continue;
+		}
+		Temp =   (bios + 0x5555); 
+		*Temp = 0xAA;                   
+		Temp =  bios + 0x2AAA; 
+		*Temp = 0x55; 
+		Temp =  bios + 0x5555; 
+		*Temp = 0xA0;                   
+		*dst = *src;
+		toggle_ready_jedec(bios);
+		if (*dst != *src)
+			printf("BAD! dst 0x%lx val 0x%x src 0x%x\n",
+			       (unsigned long)dst, *dst, *src);
+		dst++, src++;
+	}
+
+	return(0);
+}
+
+int probe_49fl004 (struct flashchip * flash)
+{
+        volatile char * bios = flash->virt_addr;
+        unsigned char  id1, id2;
+
+        *(volatile char *) (bios + 0x5555) = 0xAA;
+        myusec_delay(10);
+        *(volatile char *) (bios + 0x2AAA) = 0x55;
+        myusec_delay(10);
+        *(volatile char *) (bios + 0x5555) = 0x90;
+
+        myusec_delay(10);
+
+        id1 = *(volatile unsigned char *) bios;
+        id2 = *(volatile unsigned char *) (bios + 0x01);
+
+        *(volatile char *) (bios + 0x5555) = 0xAA;
+        *(volatile char *) (bios + 0x2AAA) = 0x55;
+        *(volatile char *) (bios + 0x5555) = 0xF0;
+
+        myusec_delay(10);
+
+	printf("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
+
+        if (id1 == flash->manufacture_id && id2 == flash->model_id)
+                return 1;
+
+        return 0;
+}
+
+int erase_49fl004 (struct flashchip * flash)
+{
+	volatile unsigned char * bios = flash->virt_addr;
+	volatile unsigned char *Temp;
+
+        Temp  = bios + 0x5555; /* set up address to be C000:5555h      */
+        *Temp = 0xAA;            /* write data 0xAA to the address       */
+	myusec_delay(10);
+        Temp  = bios + 0x2AAA; /* set up address to be C000:2AAAh      */
+        *Temp = 0x55;         /* write data 0x55 to the address       */
+	myusec_delay(10);
+        Temp  = bios + 0x5555; /* set up address to be C000:5555h      */
+        *Temp = 0x80;            /* write data 0x80 to the address       */
+	myusec_delay(10);
+        Temp  = bios + 0x5555; /* set up address to be C000:5555h      */
+        *Temp = 0xAA;         /* write data 0xAA to the address       */
+	myusec_delay(10);
+        Temp  = bios + 0x2AAA; /* set up address to be C000:2AAAh      */
+        *Temp = 0x55;          /* write data 0x55 to the address       */
+	myusec_delay(10);
+        Temp  = bios + 0x5555; /* set up address to be C000:5555h      */
+        *Temp = 0x10;       /* write data 0x10  to the address       */
+
+
+        /* wait for Toggle bit ready         */
+        toggle_ready_jedec(bios);
+
+	return(0);
+}
+
+int write_49fl004 (struct flashchip * flash, unsigned char * buf)
+{
+	int i;
+	int total_size = flash->total_size * 1024, page_size = flash->page_size;
+	volatile char * bios = flash->virt_addr;
+
+//	unprotect_49fl004 (bios);
+//	erase_49fl004(flash);
+	printf ("Programming Page: ");
+	for (i = 0; i < total_size/page_size; i++) {
+		/* erase the page before programming */
+		erase_block_49fl004(bios, i * page_size);
+
+		/* write to the sector */
+		printf ("%04d at address: 0x%08x", i, i * page_size);
+		write_block_49fl004(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");
+                fflush(stdout);
+	}
+	printf("\n");
+
+//	protect_49fl004 (bios);
+
+	return(0);
+}
diff --git a/pm49fl004.h b/pm49fl004.h
new file mode 100644
index 0000000..4a75da1
--- /dev/null
+++ b/pm49fl004.h
@@ -0,0 +1,8 @@
+#ifndef __PM49FL004_H__
+#define __PM49FL004_H__ 1
+
+extern int probe_49fl004 (struct flashchip * flash);
+extern int erase_49fl004 (struct flashchip * flash);
+extern int write_49fl004 (struct flashchip * flash, unsigned char * buf);
+
+#endif