Fix bug when calling directly recovery Makefile

common_arm/Makefile.hal

@@ -16,11 +16,11 @@
 # Default platform if no platform specified
 PLATFORM?=PM3RDV4
 
-# Standalone Mode info (path depends if make is called at top or from armsrc)
+# Standalone Mode info (path depends if make is called at top, from armsrc, or from a sibling dir like recovery/bootrom)
 # Guard Makefile.hal against implicit rules: (with % to avoid being first goal)
 %/Makefile.hal: ;
 -include armsrc/Standalone/Makefile.hal
--include Standalone/Makefile.hal
+-include ../armsrc/Standalone/Makefile.hal
 ifndef DEFAULT_STANDALONE
 $(error Could not find armsrc/Standalone/Makefile.hal)
 endif

recovery/Makefile

@@ -1,3 +1,15 @@
+
+# This Makefile might have been called directly, not via the root Makefile, so:
+ifeq ($(PLTNAME),)
+    PLATFORM_FILE ?= ../Makefile.platform
+    -include $(PLATFORM_FILE)
+    -include ../.Makefile.options.cache
+    include ../common_arm/Makefile.hal
+    ifeq ($(PLATFORM_CHANGED), true)
+        $(error platform definitions have been changed, please "make clean" at the root of the project)
+    endif
+endif
+
 include ../common_arm/Makefile.common
 
 INSTALLFW = recovery.bin