diff --git a/Makefile b/Makefile
index 360952d..debbe9b 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,8 @@
 
 OBJS  = flash_enable.o udelay.o jedec.o sst28sf040.o am29f040b.o mx29f002.o  \
 	sst39sf020.o m29f400bt.o w49f002u.o 82802ab.o msys_doc.o pm49fl004.o \
-	sst49lf040.o sst_fwhub.o layout.o lbtable.o flashchips.o flash_rom.o sharplhf00l04.o
+	sst49lf040.o sst49lfxxxc.o sst_fwhub.o layout.o lbtable.o \
+	flashchips.o flash_rom.o sharplhf00l04.o
 
 all: pciutils dep $(PROGRAM)
 
diff --git a/README b/README
index 18e595b..f296834 100644
--- a/README
+++ b/README
@@ -114,6 +114,9 @@
 SST SST-49LF003A/B
 SST SST-49LF004A/B
 SST SST-49LF008A
+SST SST-49LF004C
+SST SST-49LF008C
+SST SST-49LF016C
 ST ST-M29F400BT
 ST ST-M29F040B
 SyncMOS S29C51001T/B
@@ -140,6 +143,7 @@
 Intel PIIX4/PIIX4E/PIIX4M
 NVIDIA CK804
 NVIDIA MCP51
+NVIDIA MCP55
 SiS 630
 SiS 5595
 VIA VT8231
diff --git a/flash.h b/flash.h
index 205cb60..6807f75 100644
--- a/flash.h
+++ b/flash.h
@@ -56,6 +56,9 @@
 #define SST_49LF003A	  0x1B	/* SST 49LF003A device */
 #define SST_49LF004A	  0x60	/* SST 49LF004A device */
 #define SST_49LF008A	  0x5A	/* SST 49LF008A device */
+#define SST_49LF004C	  0x54	/* SST 49LF004C device */
+#define SST_49LF008C	  0x59	/* SST 49LF008C device */
+#define SST_49LF016C	  0x5C	/* SST 49LF016C device */
 
 #define PMC_ID            0x9D	/* PMC Manufacturer ID code   */
 #define PMC_49FL002       0x6D	/* PMC 49FL002 device code      */
diff --git a/flash_enable.c b/flash_enable.c
index 901144c..652fbcd 100644
--- a/flash_enable.c
+++ b/flash_enable.c
@@ -391,6 +391,46 @@
 	return 0;
 }
 
+//By yhlu
+static int enable_flash_mcp55(struct pci_dev *dev, char *name)
+{
+        /* register 4e.b gets or'ed with one */
+        unsigned char old, new, byte;
+        unsigned short word;
+	
+        /* 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); 
+
+        /* Set the 4MB enable bit bit */
+        byte = pci_read_byte(dev, 0x88);
+        byte |= 0xff; //256K
+        pci_write_byte(dev, 0x88, byte);
+        byte = pci_read_byte(dev, 0x8c);
+        byte |= 0xff; //1M
+        pci_write_byte(dev, 0x8c, byte);
+        word = pci_read_word(dev, 0x90);
+        word |= 0x7fff; //15M
+        pci_write_word(dev, 0x90, word);
+        
+        old = pci_read_byte(dev, 0x6d);
+        new = old | 0x01;
+        if (new == old)
+                return 0;
+        pci_write_byte(dev, 0x6d, new);
+
+        if (pci_read_byte(dev, 0x6d) != new) {
+                printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n",
+                       0x6d, new, name);
+                return -1;
+        }
+
+	return 0;
+
+}
+
 typedef struct penable {
 	unsigned short vendor, device;
 	char *name;
@@ -432,9 +472,13 @@
 
         {0x10de, 0x0260, "NVidia MCP51", enable_flash_ck804},
         {0x10de, 0x0261, "NVidia MCP51", enable_flash_ck804},
+	// {0x10de, 0x0261, "NVIDIA C51",   enable_flash_ck804}, // YHLU
         {0x10de, 0x0262, "NVidia MCP51", enable_flash_ck804},
         {0x10de, 0x0263, "NVidia MCP51", enable_flash_ck804},
 
+	{0x10de, 0x0364, "NVIDIA MCP55", enable_flash_mcp55}, // LPC
+	{0x10de, 0x0367, "NVIDIA MCP55", enable_flash_mcp55}, // Pro
+
 	{0x1002, 0x4377, "ATI SB400", enable_flash_sb400}, // ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80)
 };
 
diff --git a/flashchips.c b/flashchips.c
index e2a9173..541da09 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -31,6 +31,7 @@
 #endif
 #include "am29f040b.h"
 #include "sst28sf040.h"
+#include "sst49lfxxxc.h"
 #include "w49f002u.h"
 #include "sst39sf020.h"
 #include "sst49lf040.h"
@@ -82,6 +83,12 @@
 	 probe_sst_fwhub, erase_sst_fwhub, write_sst_fwhub, NULL},
 	{"Pm49FL002",	PMC_ID,		PMC_49FL002,	NULL, 256, 16 * 1024,
 	 probe_jedec,	erase_chip_jedec, write_49fl004,NULL},
+	{"SST49LF004C", SST_ID,	SST_49LF004C,	NULL, 512, 4 * 1024,
+	 probe_49lfxxxc, erase_49lfxxxc, write_49lfxxxc,NULL},
+	{"SST49LF008C", SST_ID,		SST_49LF008C, 	NULL, 1024, 4 * 1024 ,
+	 probe_49lfxxxc, erase_49lfxxxc, write_49lfxxxc, NULL},
+	{"SST49LF016C", SST_ID,		SST_49LF016C, 	NULL, 2048, 4 * 1024 ,
+	 probe_49lfxxxc, erase_49lfxxxc, write_49lfxxxc, NULL},
 	{"Pm49FL004",	PMC_ID,		PMC_49FL004,	NULL, 512, 64 * 1024,
 	 probe_jedec,	erase_chip_jedec, write_49fl004,NULL},
 	{"W29C011",	WINBOND_ID,	W_29C011,	NULL, 128, 128,
diff --git a/sst49lfxxxc.c b/sst49lfxxxc.c
new file mode 100644
index 0000000..cd29d0b
--- /dev/null
+++ b/sst49lfxxxc.c
@@ -0,0 +1,204 @@
+/*
+ * 49lfxxxc.c: driver for SST49LFXXXC flash models.
+ *
+ *
+ * Copyright 2000 Silicon Integrated System Corporation
+ * Copyright 2005 coresystems GmbH <stepan@openbios.org>
+ *
+ *	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:
+ *	SST49LFxxxC data sheets
+ *
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/io.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include "flash.h"
+#include "jedec.h"
+#include "debug.h"
+
+#define SECTOR_ERASE		0x30
+#define BLOCK_ERASE		0x20
+#define ERASE			0xD0
+#define AUTO_PGRM		0x10
+#define RESET			0xFF
+#define READ_ID			0x90
+#define READ_STATUS		0x70
+#define CLEAR_STATUS		0x50
+
+#define STATUS_BPS		(1 << 1)
+#define	STATUS_ESS		(1 << 6)
+#define	STATUS_WSMS		(1 << 7)
+
+
+static __inline__ int write_lockbits_49lfxxxc(volatile uint8_t *bios, int size,
+					    unsigned char bits)
+{
+	int i, left = size;
+	unsigned long address;
+
+	//printf("bios=0x%08lx\n", (unsigned long)bios);
+	for (i = 0; left > 65536; i++, left -= 65536) {
+		//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFC00000 - size + (i * 65536) + 2, *(bios + (i * 65536) + 2) );
+		*(bios + (i * 65536) + 2) = bits;
+	}
+	address = i * 65536;
+		//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFc00000 - size + address + 2, *(bios + address + 2) );
+	*(bios + address + 2) = bits;
+	address += 32768;
+		//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFc00000 - size + address + 2, *(bios + address + 2) );
+	*(bios + address + 2) = bits;
+	address += 8192;
+		//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFc00000 - size + address + 2, *(bios + address + 2) );
+	*(bios + address + 2) = bits;
+	address += 8192;
+		//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFc00000 - size + address + 2, *(bios + address + 2) );
+	*(bios + address + 2) = bits;
+
+
+	return (0);
+}
+
+static __inline__ int erase_sector_49lfxxxc(volatile uint8_t *bios,
+					   unsigned long address)
+{
+	unsigned char status;
+
+	*bios = SECTOR_ERASE;
+	*(bios + address) = ERASE;
+
+	do {
+    		status = *bios;
+		if (status & (STATUS_ESS | STATUS_BPS)) {
+			printf("sector erase FAILED at address=0x%08lx status=0x%01x\n", (unsigned long)bios + address, status); 
+			*bios = CLEAR_STATUS;
+			return(-1);
+		}
+        } while (!(status & STATUS_WSMS));
+
+	return (0);
+}
+
+static __inline__ int write_sector_49lfxxxc(volatile uint8_t *bios,
+					   uint8_t *src,
+					   volatile uint8_t *dst,
+					   unsigned int page_size)
+{
+	int i;
+	unsigned char status;
+
+	*bios = CLEAR_STATUS;
+	for (i = 0; i < page_size; i++) {
+		/* transfer data from source to destination */
+		if (*src == 0xFF) {
+			dst++, src++;
+			/* If the data is 0xFF, don't program it */
+			continue;
+		}
+		/*issue AUTO PROGRAM command */
+		*bios = AUTO_PGRM;
+		*dst++ = *src++;
+
+		do {
+			status = *bios;
+			if (status & (STATUS_ESS | STATUS_BPS)) {
+				printf("sector write FAILED at address=0x%08lx status=0x%01x\n", (unsigned long)dst, status); 
+				*bios = CLEAR_STATUS;
+				return(-1);
+			}
+		} while (!(status & STATUS_WSMS));
+	}
+
+	return (0);
+}
+
+int probe_49lfxxxc(struct flashchip *flash)
+{
+	volatile uint8_t *bios = flash->virt_addr;
+	uint8_t id1, id2;
+	size_t size = flash->total_size * 1024;
+
+	*bios = RESET;
+
+	*bios = READ_ID;
+	id1 = *(volatile uint8_t *) bios;
+	id2 = *(volatile uint8_t *) (bios + 0x01);
+
+	*bios = RESET;
+
+	printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
+	if (!(id1 == flash->manufacture_id && id2 == flash->model_id))
+		return 0;
+
+	bios = mmap(0, size, PROT_WRITE | PROT_READ, MAP_SHARED,
+		    flash->fd_mem, (off_t) (0xFFFFFFFF - 0x400000 - size + 1));
+	if (bios == MAP_FAILED) {
+		// it's this part but we can't map it ...
+		perror("Error MMAP /dev/mem");
+		exit(1);
+	}
+	flash->virt_addr_2 = bios;
+	return 1;
+}
+
+int erase_49lfxxxc(struct flashchip *flash)
+{
+	volatile uint8_t *bios = flash->virt_addr;
+	volatile uint8_t *bios2 = flash->virt_addr_2;
+	int i;
+	unsigned int total_size = flash->total_size * 1024;
+
+	write_lockbits_49lfxxxc(bios2, total_size, 0);
+	for (i = 0; i < total_size; i += flash->page_size)
+		if (erase_sector_49lfxxxc(bios, i) != 0 )
+		    return (-1);
+
+	*bios = RESET;
+	return (0);
+}
+
+int write_49lfxxxc(struct flashchip *flash, uint8_t *buf)
+{
+	int i;
+	int total_size = flash->total_size * 1024, page_size =
+	    flash->page_size;
+	volatile uint8_t *bios = flash->virt_addr;
+
+
+	write_lockbits_49lfxxxc(flash->virt_addr_2, total_size, 0);
+	printf("Programming Page: ");
+	for (i = 0; i < total_size / page_size; i++) {
+		/* erase the page before programming */
+		erase_sector_49lfxxxc(bios, i * page_size);
+
+		/* write to the sector */
+		printf("%04d at address: 0x%08x", i, i * page_size);
+		write_sector_49lfxxxc(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("\n");
+
+	*bios = RESET;
+	return (0);
+}
diff --git a/sst49lfxxxc.h b/sst49lfxxxc.h
new file mode 100644
index 0000000..8768b1f
--- /dev/null
+++ b/sst49lfxxxc.h
@@ -0,0 +1,8 @@
+#ifndef __SST49LFXXXC_H__
+#define __SST49LFXXXC_H__
+
+extern int probe_49lfxxxc(struct flashchip *flash);
+extern int erase_49lfxxxc(struct flashchip *flash);
+extern int write_49lfxxxc(struct flashchip *flash, uint8_t *buf);
+
+#endif				/* !__SST49LFXXXC_H__ */