share/sysbuild: Support single app slot RAM load mode

Adds a new Kconfig to support MCUboot single application slot RAM load
mode.

Signed-off-by: Ederson de Souza <[email protected]>

Author: edersondisouza

scripts/ci/check_compliance.py

@@ -1101,6 +1101,7 @@ def check_no_undef_outside_kconfig(self, kconf):
         "SEL",
         "SHIFT",
         "SINGLE_APPLICATION_SLOT", # Used in sysbuild for MCUboot configuration
+        "SINGLE_APPLICATION_SLOT_RAM_LOAD", # Used in sysbuild for MCUboot configuration
         "SOC_SERIES_", # Used as regex in scripts/utils/board_v1_to_v2.py
         "SOC_WATCH",  # Issue 13749
         "SOME_BOOL",

share/sysbuild/image_configurations/BOOTLOADER_image_default.cmake

@@ -12,7 +12,8 @@ set(bootmodes CONFIG_SINGLE_APPLICATION_SLOT
               CONFIG_BOOT_SWAP_USING_MOVE
               CONFIG_BOOT_DIRECT_XIP
               CONFIG_BOOT_RAM_LOAD
-              CONFIG_BOOT_FIRMWARE_LOADER)
+              CONFIG_BOOT_FIRMWARE_LOADER
+              CONFIG_SINGLE_APPLICATION_SLOT_RAM_LOAD)
 
 if(SB_CONFIG_MCUBOOT_MODE_SINGLE_APP)
   set(bootmode CONFIG_SINGLE_APPLICATION_SLOT)
@@ -30,6 +31,8 @@ elseif(SB_CONFIG_MCUBOOT_MODE_RAM_LOAD)
   set(bootmode CONFIG_BOOT_RAM_LOAD)
 elseif(SB_CONFIG_MCUBOOT_MODE_FIRMWARE_UPDATER)
   set(bootmode CONFIG_BOOT_FIRMWARE_LOADER)
+elseif(SB_CONFIG_MCUBOOT_MODE_SINGLE_APP_RAM_LOAD)
+  set(bootmode CONFIG_SINGLE_APPLICATION_SLOT_RAM_LOAD)
 endif()
 
 foreach(loopbootmode ${bootmodes})

share/sysbuild/image_configurations/MAIN_image_default.cmake

@@ -41,5 +41,7 @@ if(SB_CONFIG_BOOTLOADER_MCUBOOT)
     set_config_int(${ZCMAKE_APPLICATION} CONFIG_FLASH_SIZE 0)
   elseif(SB_CONFIG_MCUBOOT_MODE_FIRMWARE_UPDATER)
     set_config_bool(${ZCMAKE_APPLICATION} CONFIG_MCUBOOT_BOOTLOADER_MODE_FIRMWARE_UPDATER y)
+  elseif(SB_CONFIG_MCUBOOT_MODE_SINGLE_APP_RAM_LOAD)
+    set_config_bool(${ZCMAKE_APPLICATION} CONFIG_MCUBOOT_BOOTLOADER_MODE_SINGLE_APP_RAM_LOAD y)
   endif()
 endif()

share/sysbuild/images/bootloader/Kconfig

@@ -126,6 +126,19 @@ config MCUBOOT_MODE_FIRMWARE_UPDATER
 	  mechanism defined for entering the slot1_partition which is a dedicated firmware updater
 	  application used to update the slot0_partition application.
 
+config MCUBOOT_MODE_SINGLE_APP_RAM_LOAD
+	bool "Single app RAM load mode"
+	help
+	  MCUboot can load the image to RAM from an arbitrary location. In this mode,
+	  MCUboot will copy the image to RAM and begin execution from there. The image
+	  must be linked to execute from RAM, the address that it is copied to is
+	  specified using the load-addr argument when running imgtool.
+	  Note that while not used directly, a slot0_partition must be defined in the
+	  DT, as it is used to get information about size of the image to be loaded.
+	  This option automatically selects MCUBOOT_BOOTLOADER_NO_DOWNGRADE as it is
+	  not possible to swap back to older version of the application. In fact, none
+	  of the swap operations are supported in this mode.
+
 endchoice
 
 config SIGNATURE_TYPE