trusted-firmware-m: Define header and trailer options

The current behaviour when signing an image is to set always --pad and
--pad-header for all images unless TFM_USE_NS_APP is set. This does not
allow easy creation of a signed image for FOTA applications. Rewrite
the PAD parameter into HEADER and TRAILER to easy setup more signing
options.

Signed-off-by: BUDKE Gerson Fernando <[email protected]>

Author: nandojve

modules/trusted-firmware-m/CMakeLists.txt

@@ -472,9 +472,13 @@ if (CONFIG_BUILD_WITH_TFM)
   math(EXPR S_MAX_SECTORS "${s_partition_size} / ${flash_erase_block_size}")
   math(EXPR NS_MAX_SECTORS "${ns_partition_size} / ${flash_erase_block_size}")
 
-  function(tfm_sign OUT_ARG SUFFIX PAD MAX_SECTORS INPUT_FILE OUTPUT_FILE)
-    if(PAD)
+  function(tfm_sign OUT_ARG SUFFIX HEADER TRAILER MAX_SECTORS INPUT_FILE OUTPUT_FILE)
+    if(HEADER AND TRAILER)
       set(pad_args --pad --pad-header)
+    elseif(HEADER)
+      set(pad_args --pad-header)
+    elseif(TRAILER)
+      set(pad_args --pad)
     endif()
     # Secure + Non-secure images are signed the same way as a secure only
     # build, but with a different layout file.
@@ -533,7 +537,7 @@ if (CONFIG_BUILD_WITH_TFM)
     )
 
   elseif(CONFIG_TFM_MCUBOOT_IMAGE_NUMBER STREQUAL "1")
-    tfm_sign(sign_cmd S_NS TRUE ${S_MAX_SECTORS} ${S_NS_FILE} ${S_NS_SIGNED_FILE})
+    tfm_sign(sign_cmd S_NS TRUE TRUE ${S_MAX_SECTORS} ${S_NS_FILE} ${S_NS_SIGNED_FILE})
 
     set_property(GLOBAL APPEND PROPERTY extra_post_build_commands
       COMMAND ${PYTHON_EXECUTABLE} ${ZEPHYR_BASE}/scripts/build/mergehex.py
@@ -558,12 +562,12 @@ if (CONFIG_BUILD_WITH_TFM)
 
   else()
     if (CONFIG_TFM_USE_NS_APP)
-      tfm_sign(sign_cmd_ns NS TRUE ${NS_MAX_SECTORS} ${NS_APP_FILE} ${NS_SIGNED_FILE})
+      tfm_sign(sign_cmd_ns NS TRUE TRUE ${NS_MAX_SECTORS} ${NS_APP_FILE} ${NS_SIGNED_FILE})
     else()
-      tfm_sign(sign_cmd_ns NS FALSE ${NS_MAX_SECTORS} ${NS_APP_FILE} ${NS_SIGNED_FILE})
+      tfm_sign(sign_cmd_ns NS FALSE TRUE ${NS_MAX_SECTORS} ${NS_APP_FILE} ${NS_SIGNED_FILE})
     endif()
 
-    tfm_sign(sign_cmd_s S TRUE ${S_MAX_SECTORS} $<TARGET_PROPERTY:tfm,TFM_S_HEX_FILE> ${S_SIGNED_FILE})
+    tfm_sign(sign_cmd_s S TRUE TRUE ${S_MAX_SECTORS} $<TARGET_PROPERTY:tfm,TFM_S_HEX_FILE> ${S_SIGNED_FILE})
 
     #Create and sign for concatenated binary image, should align with the TF-M BL2
     set_property(GLOBAL APPEND PROPERTY extra_post_build_commands