Index: coreboot/util/nvramtool/nvramtool.c
===================================================================
--- coreboot.orig/util/nvramtool/nvramtool.c
+++ coreboot/util/nvramtool/nvramtool.c
@@ -28,6 +28,10 @@
  *  51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 \*****************************************************************************/
 
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
 #include "common.h"
 #include "opts.h"
 #include "lbtable.h"
@@ -93,6 +97,7 @@ static const hexdump_format_t cmos_dump_
  ****************************************************************************/
 int main(int argc, char *argv[])
 {
+	void *cmos_default = NULL;
 	cmos_layout_get_fn_t fn = get_layout_from_cmos_table;
 
 	parse_nvramtool_args(argc, argv);
@@ -105,12 +110,38 @@ int main(int argc, char *argv[])
 		fn = get_layout_from_cmos_table;
 	} else if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CBFS_FILE].found) {
 		open_cbfs(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CBFS_FILE].param);
-		void *cmosdefault = cbfs_find_file("cmos.default", CBFS_COMPONENT_CMOS_DEFAULT, NULL);
-		if (cmosdefault == NULL) {
-			printf("Need a cmos.default in the CBFS image for now.\n");
+		if (!nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].found) {
+			cmos_default = cbfs_find_file("cmos.default", CBFS_COMPONENT_CMOS_DEFAULT, NULL);
+			if (cmos_default == NULL) {
+				fprintf(stderr, "Need a cmos.default in the CBFS image or separate cmos file (-D).\n");
+				exit(1);
+			}
+		}
+	}
+	if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].found) {
+		int fd;
+		struct stat fd_stat;
+	       	if ((fd = open(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param, O_RDWR | O_CREAT, 0666)) < 0) {
+			fprintf(stderr, "Couldn't open '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
+			exit(1);
+		}
+		if (fstat(fd, &fd_stat) == -1) {
+			fprintf(stderr, "Couldn't stat '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
 			exit(1);
 		}
-		select_hal(HAL_MEMORY, cmosdefault);
+		if (fd_stat.st_size < 128) {
+			lseek(fd, 127, SEEK_SET);
+			write(fd, "\0", 1);
+			fsync(fd);
+		}
+		cmos_default = mmap(NULL, 128, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+		if (cmos_default == MAP_FAILED) {
+			fprintf(stderr, "Couldn't map '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
+			exit(1);
+		}
+	}
+	if (cmos_default) {
+		select_hal(HAL_MEMORY, cmos_default);
 		fn = get_layout_from_cbfs_file;
 	}
 
Index: coreboot/util/nvramtool/opts.c
===================================================================
--- coreboot.orig/util/nvramtool/opts.c
+++ coreboot/util/nvramtool/opts.c
@@ -41,7 +41,7 @@ static void register_op_modifier(nvramto
 static void resolve_op_modifiers(void);
 static void sanity_check_args(void);
 
-static const char getopt_string[] = "-ab:B:c::C:de:hil::np:r:tvw:xX:y:Y";
+static const char getopt_string[] = "-ab:B:c::C:dD:e:hil::np:r:tvw:xX:y:Y";
 
 /****************************************************************************
  * parse_nvramtool_args
@@ -89,6 +89,10 @@ void parse_nvramtool_args(int argc, char
 		case 'd':
 			register_op(&op_found, NVRAMTOOL_OP_LBTABLE_DUMP, NULL);
 			break;
+		case 'D':
+			register_op_modifier(NVRAMTOOL_MOD_USE_CMOS_FILE,
+					     optarg);
+			break;
 		case 'e':
 			register_op(&op_found, NVRAMTOOL_OP_SHOW_PARAM_VALUES,
 				    optarg);
Index: coreboot/util/nvramtool/opts.h
===================================================================
--- coreboot.orig/util/nvramtool/opts.h
+++ coreboot/util/nvramtool/opts.h
@@ -59,6 +59,7 @@ typedef struct {
 typedef enum { NVRAMTOOL_MOD_SHOW_VALUE_ONLY = 0,
 	NVRAMTOOL_MOD_USE_CMOS_LAYOUT_FILE,
 	NVRAMTOOL_MOD_USE_CBFS_FILE,
+	NVRAMTOOL_MOD_USE_CMOS_FILE,
 	NVRAMTOOL_MOD_USE_CMOS_OPT_TABLE,
 	NVRAMTOOL_NUM_OP_MODIFIERS	/* must always be last */
 } nvramtool_op_modifier_t;
Index: coreboot/util/nvramtool/common.c
===================================================================
--- coreboot.orig/util/nvramtool/common.c
+++ coreboot/util/nvramtool/common.c
@@ -82,7 +82,8 @@ void usage(FILE * outfile)
 		"LAYOUT_FILE.\n"
 		"       -t:             Use CMOS layout specified by CMOS option "
 		"table.\n"
-		"       -C CBFS_FILE:   Use CBFS file for layout and CMOS defaults.\n"
+		"       -C CBFS_FILE:   Use CBFS file for layout and CMOS data.\n"
+		"       -D CMOS_FILE:   Use CMOS file for CMOS data (overrides CMOS of -C).\n"
 		"       [-n] -r NAME:   Show parameter NAME.  If -n is given, "
 		"show value only.\n"
 		"       -e NAME:        Show all possible values for parameter "
