build: uf2: set offset when building RAM images

Follow ROMABLE_REGION from include/.../arm/cortex_m/scripts/linker.ld

This enables UF2 images to be created for RAM-only apps on RP2350.

Signed-off-by: Dmitrii Sharshakov <d3dx12.xx@gmail.com>

CMakeLists.txt

@@ -1872,26 +1872,39 @@ endif()
 
 if(CONFIG_BUILD_OUTPUT_BIN AND CONFIG_BUILD_OUTPUT_UF2)
   if(CONFIG_BUILD_OUTPUT_UF2_USE_FLASH_BASE)
-    set(flash_addr "${CONFIG_FLASH_BASE_ADDRESS}")
+    set(code_address "${CONFIG_FLASH_BASE_ADDRESS}")
   else()
-    set(flash_addr "${CONFIG_FLASH_LOAD_OFFSET}")
+    set(code_address "${CONFIG_FLASH_LOAD_OFFSET}")
   endif()
 
   if(CONFIG_BUILD_OUTPUT_UF2_USE_FLASH_OFFSET)
     # Note, the `+ 0` in formula below avoids errors in cases where a Kconfig
     #       variable is undefined and thus expands to nothing.
-    math(EXPR flash_addr
-        "${flash_addr} + ${CONFIG_FLASH_LOAD_OFFSET} + 0"
+    math(EXPR code_address
+        "${code_address} + ${CONFIG_FLASH_LOAD_OFFSET} + 0"
          OUTPUT_FORMAT HEXADECIMAL
     )
   endif()
 
+  # No-XIP images (such as ones for RP2350 with CONFIG_XIP=n)
+  # are typically loaded to RAM
+  if(NOT CONFIG_XIP)
+    if(CONFIG_BUILD_OUTPUT_ADJUST_LMA)
+      math(EXPR code_address
+          "${CONFIG_SRAM_BASE_ADDRESS} + ${CONFIG_BUILD_OUTPUT_ADJUST_LMA} + 0"
+          OUTPUT_FORMAT HEXADECIMAL
+      )
+    else()
+      set(code_address "${CONFIG_SRAM_BASE_ADDRESS}")
+    endif()
+  endif()
+
   list(APPEND
     post_build_commands
     COMMAND ${PYTHON_EXECUTABLE} ${ZEPHYR_BASE}/scripts/build/uf2conv.py
             -c
             -f ${CONFIG_BUILD_OUTPUT_UF2_FAMILY_ID}
-            -b ${flash_addr}
+            -b ${code_address}
             -o ${KERNEL_UF2_NAME}
             ${KERNEL_BIN_NAME}
   )