feat: store wolfboot version in named section

Author: vhdirk

arch.mk

@@ -3361,5 +3361,9 @@ ifeq ($(BIG_ENDIAN),1)
   CFLAGS+=-D"BIG_ENDIAN_ORDER"
 endif
 
+ifeq ($(WOLFBOOT_VERSION_SECTION),)
+  CFLAGS+=-DWOLFBOOT_VERSION_SECTION=$(WOLFBOOT_VERSION_SECTION)
+endif
+
 CFLAGS+=-DWOLFBOOT_ARCH_$(ARCH)
 CFLAGS+=-DTARGET_$(TARGET)

include/wolfboot/wolfboot.h

@@ -113,6 +113,10 @@ extern "C" {
 #  endif
 #endif
 
+#ifndef WB_STRINGIFY
+#define _WB_STRINGIFY_L2(str) #str
+#define WB_STRINGIFY(str) _WB_STRINGIFY_L2(str)
+#endif
 
 /* Helpers for memory alignment */
 #ifndef XALIGNED

src/loader.c

@@ -51,7 +51,13 @@ extern unsigned int _start_text;
 /**
  * @brief wolfBoot version number (used in RAM code).
  */
-static volatile const uint32_t __attribute__((used)) wolfboot_version = WOLFBOOT_VERSION;
+#if defined(VERSION_SECTION)
+#define WOLFBOOT_VERSION_SECTION __attribute__((section(WB_STRINGIFY(VERSION_SECTION))))
+#else
+#define WOLFBOOT_VERSION_SECTION
+#endif
+
+static volatile const uint32_t __attribute__((used)) WOLFBOOT_VERSION_SECTION wolfboot_version = WOLFBOOT_VERSION;
 /**
  * @brief RAM Interrupt Vector table.
  */

src/update_flash.c

@@ -126,7 +126,8 @@ extern unsigned int _start_text;
 extern unsigned int __logical_binary_start;
 unsigned int _start_text = (unsigned int)&__logical_binary_start;
 #endif
-static volatile const uint32_t __attribute__((used)) wolfboot_version = WOLFBOOT_VERSION;
+
+static volatile const uint32_t __attribute__((used)) WOLFBOOT_VERSION_SECTION wolfboot_version = WOLFBOOT_VERSION;
 
 #ifdef EXT_FLASH
 #  ifndef BUFFER_DECLARED