These are the current changes required for running flashrom on Windows.
You will need DirectIO for Windows (To be released soon)

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>

Index: flash.h
===================================================================
--- flash.h	(revision 671)
+++ flash.h	(working copy)
@@ -30,7 +30,11 @@
 #include <unistd.h>
 #include <stdint.h>
 #include <stdio.h>
+#ifdef __MINGW32_VERSION
+#include "directio.h"
+#else
 #include <pci/pci.h>
+#endif
 
 /* for iopl and outb under Solaris */
 #if defined (__sun) && (defined(__i386) || defined(__amd64))
Index: serprog.c
===================================================================
--- serprog.c	(revision 671)
+++ serprog.c	(working copy)
@@ -23,18 +23,21 @@
 #include <stdlib.h>
 #include <ctype.h>
 #include <fcntl.h>
+
+#if SERPROG_SUPPORT == 1
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <netdb.h>
+#include <termios.h>
+#endif
 #include <sys/stat.h>
 #include <errno.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <inttypes.h>
-#include <termios.h>
 #include "flash.h"
 
 char *serprog_param = NULL;
Index: physmap.c
===================================================================
--- physmap.c	(revision 671)
+++ physmap.c	(working copy)
@@ -24,6 +24,21 @@
 #include <errno.h>
 #include "flash.h"
 
+#ifdef __MINGW32_VERSION
+#define MEM_DEV "DirectIO"
+
+void *sys_physmap(unsigned long phys_addr, size_t len)
+{
+	return map_physical_addr_range(phys_addr, len);
+}
+
+void physunmap(void *virt_addr, size_t len)
+{
+	unmap_physical_addr_range(virt_addr, len);
+}
+
+
+#else
 #ifdef __DARWIN__
 #include <DirectIO/darwinio.h>
 
@@ -77,6 +92,7 @@
 	munmap(virt_addr, len);
 }
 #endif
+#endif
 
 void *physmap(const char *descr, unsigned long phys_addr, size_t len)
 {
Index: Makefile
===================================================================
--- Makefile	(revision 671)
+++ Makefile	(working copy)
@@ -19,7 +19,7 @@
 
 PROGRAM = flashrom
 
-CC      ?= gcc
+CC      = gcc
 STRIP   = strip
 INSTALL = install
 DIFF    = diff
@@ -41,7 +41,11 @@
 LDFLAGS += -L/usr/local/lib
 endif
 
+ifeq ($(OS), Windows_NT)
+LIBS += -L. -ldirectio
+else
 LIBS += -lpci -lz
+endif
 
 OBJS = chipset_enable.o board_enable.o udelay.o jedec.o stm50flw0x0x.o \
 	sst28sf040.o am29f040b.o mx29f002.o m29f400bt.o pm29f002.o \
@@ -68,8 +72,10 @@
 	$(CC) $(LDFLAGS) -o $(PROGRAM) $(OBJS) $(LIBS) $(FEATURE_LIBS)
 
 FEATURE_CFLAGS = $(shell LC_ALL=C grep -q "FTDISUPPORT := yes" .features && printf "%s" "-D'FT2232_SPI_SUPPORT=1'")
-# Always enable serprog for now. Needs to be disabled on Windows.
+
+ifneq ($(OS), Windows_NT)
 FEATURE_CFLAGS += -D'SERPROG_SUPPORT=1'
+endif
 
 FEATURE_LIBS = $(shell LC_ALL=C grep -q "FTDISUPPORT := yes" .features && printf "%s" "-lftdi")
 
@@ -102,6 +108,7 @@
 		rm -f .test.c .test; exit 1)
 	@rm -f .test.c .test
 
+ifneq ($(OS), Windows_NT)
 pciutils: compiler
 	@printf "Checking for pciutils and zlib... "
 	@$(shell ( echo "#include <pci/pci.h>";		   \
@@ -114,6 +121,7 @@
 		echo "See README for more information."; echo;		\
 		rm -f .test.c .test; exit 1)
 	@rm -f .test.c .test
+endif
 
 .features: features
 
Index: cbtable.c
===================================================================
--- cbtable.c	(revision 671)
+++ cbtable.c	(working copy)
@@ -205,8 +205,15 @@
 			start = forward->forward;
 			start &= ~(getpagesize() - 1);
 			physunmap(table_area, BYTES_TO_MAP);
+#if defined(__MINGW32_VERSION)
+			/* For some reason MINGW/directio does not like
+			 * mapping the high table area yet
+			 */
+			lb_table=NULL;
+#else
 			table_area = physmap("high tables", start, BYTES_TO_MAP);
 			lb_table = find_lb_table(table_area, 0x00000, 0x1000);
+#endif
 		}
 	}