diff --git a/src/drivers/smmstore/smi.c b/src/drivers/smmstore/smi.c
index 6ea447ffe6e..e1721067335 100644
--- a/src/drivers/smmstore/smi.c
+++ b/src/drivers/smmstore/smi.c
@@ -79,6 +79,10 @@ static uint32_t smmstorev2_exec(uint8_t command, void *param)
 {
 	uint32_t ret = SMMSTORE_RET_FAILURE;
 
+#if CONFIG(DRIVERS_EFI_UPDATE_CAPSULES)
+	smmstore_should_use_full_flash(&command);
+#endif
+
 	switch (command) {
 	case SMMSTORE_CMD_INIT: {
 		printk(BIOS_DEBUG, "Init SMM store\n");
diff --git a/src/drivers/smmstore/store.c b/src/drivers/smmstore/store.c
index 270384c3c6d..1e64a909cd8 100644
--- a/src/drivers/smmstore/store.c
+++ b/src/drivers/smmstore/store.c
@@ -47,8 +47,36 @@ _Static_assert(SMM_BLOCK_SIZE <= FMAP_SECTION_SMMSTORE_SIZE,
  * crash/reboot could clear out all variables.
  */
 
+#if CONFIG(DRIVERS_EFI_UPDATE_CAPSULES)
+#define SMMSTORE_CMD_USE_FULL_FLASH 0x80
+
+static int use_full_flash;
+
+void smmstore_should_use_full_flash(uint8_t *cmd)
+{
+	if ((*cmd & SMMSTORE_CMD_USE_FULL_FLASH) == SMMSTORE_CMD_USE_FULL_FLASH) {
+		use_full_flash = 1;
+		*cmd &= ~SMMSTORE_CMD_USE_FULL_FLASH;
+	} else {
+		use_full_flash = 0;
+	}
+
+}
+#endif
+
 static enum cb_err lookup_store_region(struct region *region)
 {
+#if CONFIG(DRIVERS_EFI_UPDATE_CAPSULES)
+	if (use_full_flash) {
+		const struct region_device *rdev = boot_device_rw();
+		if (rdev == NULL)
+			return CB_ERR;
+
+		*region = *region_device_region(rdev);
+		return CB_SUCCESS;
+	}
+#endif
+
 	if (fmap_locate_area(SMMSTORE_REGION, region)) {
 		printk(BIOS_WARNING,
 		       "smm store: Unable to find SMM store FMAP region '%s'\n",
diff --git a/src/include/smmstore.h b/src/include/smmstore.h
index d3940abc3f2..27cf7dc4826 100644
--- a/src/include/smmstore.h
+++ b/src/include/smmstore.h
@@ -117,6 +117,9 @@ int smmstore_get_info(struct smmstore_params_info *info);
 #endif
 struct region_device;
 int smmstore_lookup_region(struct region_device *rstore);
+#if CONFIG(DRIVERS_EFI_UPDATE_CAPSULES)
+void smmstore_should_use_full_flash(uint8_t *cmd);
+#endif
 
 /* Advertise SMMSTORE v2 support */
 struct lb_header;