boot/zephyr: Add CONFIG_SINGLE_APPLICATION_SLOT_RAM_LOAD

This option basically enables MCUBOOT_RAM_LOAD in a single
slot configuration, meaning the image on slot0 will be loaded into RAM.

Signed-off-by: Ederson de Souza <ederson.desouza@intel.com>

Author: edersondisouza

boot/zephyr/CMakeLists.txt

@@ -127,7 +127,7 @@ zephyr_library_sources(
   )
 endif()
 
-if(CONFIG_SINGLE_APPLICATION_SLOT)
+if(CONFIG_SINGLE_APPLICATION_SLOT OR CONFIG_SINGLE_APPLICATION_SLOT_RAM_LOAD)
 zephyr_library_sources(
   ${BOOT_DIR}/zephyr/single_loader.c
   )
@@ -147,7 +147,7 @@ zephyr_library_sources(
   )
 endif()
 
-if(CONFIG_BOOT_RAM_LOAD)
+if(CONFIG_BOOT_RAM_LOAD OR CONFIG_SINGLE_APPLICATION_SLOT_RAM_LOAD)
   zephyr_library_sources(
     ${BOOT_DIR}/bootutil/src/ram_load.c
     )
@@ -400,7 +400,7 @@ if(CONFIG_BOOT_MAX_IMG_SECTORS_AUTO)
     math(EXPR slot_min_sectors "${slot0_size} / ${erase_size_slot0}")
   endif()
 
-  if(NOT CONFIG_SINGLE_APPLICATION_SLOT)
+  if(NOT CONFIG_SINGLE_APPLICATION_SLOT AND NOT CONFIG_SINGLE_APPLICATION_SLOT_RAM_LOAD)
     dt_nodelabel(slot1_flash NODELABEL "slot1_partition")
     dt_prop(slot1_size PATH "${slot1_flash}" PROPERTY "reg" INDEX 1)
     dt_get_parent(slot1_flash)

boot/zephyr/Kconfig

@@ -271,19 +271,6 @@ config BOOT_FIRMWARE_LOADER
 
 endchoice
 
-# Workaround for not being able to have commas in macro arguments
-DT_CHOSEN_Z_SRAM := zephyr,sram
-
-if BOOT_RAM_LOAD
-config BOOT_IMAGE_EXECUTABLE_RAM_START
-	hex "Boot image executable ram start"
-	default $(dt_chosen_reg_addr_hex,$(DT_CHOSEN_Z_SRAM))
-
-config BOOT_IMAGE_EXECUTABLE_RAM_SIZE
-	int "Boot image executable base size"
-	default $(dt_chosen_reg_size_int,$(DT_CHOSEN_Z_SRAM),0)
-endif
-
 config BOOT_DIRECT_XIP_REVERT
 	bool "Enable the revert mechanism in direct-xip mode"
 	depends on BOOT_DIRECT_XIP
@@ -320,6 +307,27 @@ config BOOT_SWAP_SAVE_ENCTLV
 
 endif # !SINGLE_APPLICATION_SLOT
 
+config SINGLE_APPLICATION_SLOT_RAM_LOAD
+	bool "RAM load for single application slot"
+	help
+	  If y, the image is loaded to RAM and executed from there. For this reason,
+	  the image has to be linked to be executed from RAM. The address that the
+	  image is copied to is specified using the load-addr argument to the
+	  imgtool.py script which writes it to the image header.
+
+# Workaround for not being able to have commas in macro arguments
+DT_CHOSEN_Z_SRAM := zephyr,sram
+
+if BOOT_RAM_LOAD || SINGLE_APPLICATION_SLOT_RAM_LOAD
+config BOOT_IMAGE_EXECUTABLE_RAM_START
+	hex "Boot image executable ram start"
+	default $(dt_chosen_reg_addr_hex,$(DT_CHOSEN_Z_SRAM))
+
+config BOOT_IMAGE_EXECUTABLE_RAM_SIZE
+	int "Boot image executable base size"
+	default $(dt_chosen_reg_size_int,$(DT_CHOSEN_Z_SRAM),0)
+endif
+
 config BOOT_ENCRYPTION_SUPPORT
 	bool
 	help
@@ -622,7 +630,7 @@ config BOOT_INTR_VEC_RELOC
 config UPDATEABLE_IMAGE_NUMBER
 	int "Number of updateable images"
 	default 1
-	range 1 1 if SINGLE_APPLICATION_SLOT
+	range 1 1 if SINGLE_APPLICATION_SLOT || SINGLE_APPLICATION_SLOT_RAM_LOAD
 	help
 	  Enables support of multi image update.
 

boot/zephyr/include/mcuboot_config/mcuboot_config.h

@@ -108,6 +108,14 @@
 
 #endif /* CONFIG_SINGLE_APPLICATION_SLOT */
 
+#ifdef CONFIG_SINGLE_APPLICATION_SLOT_RAM_LOAD
+#define MCUBOOT_RAM_LOAD    1
+#define MCUBOOT_IMAGE_NUMBER    1
+#define MCUBOOT_SINGLE_APPLICATION_SLOT_RAM_LOAD    1
+#define IMAGE_EXECUTABLE_RAM_START CONFIG_BOOT_IMAGE_EXECUTABLE_RAM_START
+#define IMAGE_EXECUTABLE_RAM_SIZE CONFIG_BOOT_IMAGE_EXECUTABLE_RAM_SIZE
+#endif
+
 #ifdef CONFIG_LOG
 #define MCUBOOT_HAVE_LOGGING 1
 #endif