add boot2 info to binary info

src/common/pico_binary_info/include/pico/binary_info/structure.h

@@ -54,6 +54,7 @@ typedef struct _binary_info_core binary_info_t;
 #define BINARY_INFO_ID_RP_PROGRAM_BUILD_ATTRIBUTE 0x4275f0d3
 #define BINARY_INFO_ID_RP_SDK_VERSION 0x5360b3ab
 #define BINARY_INFO_ID_RP_PICO_BOARD 0xb63cffbb
+#define BINARY_INFO_ID_RP_BOOT2_NAME 0x7f8882e1
 
 #if PICO_ON_DEVICE
 #define bi_ptr_of(x) x *

src/rp2_common/boot_stage2/CMakeLists.txt

@@ -12,11 +12,12 @@ endif()
 # needed by function below
 set(PICO_BOOT_STAGE2_DIR "${CMAKE_CURRENT_LIST_DIR}" CACHE INTERNAL "")
 
+# by convention the first source file name without extension is used for the binary info name
 function(pico_define_boot_stage2 NAME SOURCES)
     add_executable(${NAME}
             ${SOURCES}
     )
-    
+
     # todo bit of an abstraction failure - revisit for Clang support anyway
     if (CMAKE_C_COMPILER_ID STREQUAL "Clang")
         target_link_options(${NAME} PRIVATE "-nostdlib")
@@ -53,6 +54,12 @@ function(pico_define_boot_stage2 NAME SOURCES)
     add_dependencies(${NAME}_library ${NAME}_padded_checksummed_asm)
     # not strictly (or indeed actually) a link library, but this avoids dependency cycle
     target_link_libraries(${NAME}_library INTERFACE ${PADDED_CHECKSUMMED_ASM})
+
+    list(GET SOURCES 0 FIRST_SOURCE)
+    get_filename_component(BOOT2_BI_NAME ${FIRST_SOURCE} NAME_WE)
+
+    target_compile_definitions(${NAME}_library INTERFACE
+            -DPICO_BOOT2_NAME="${BOOT2_BI_NAME}")
 endfunction()
 
 macro(pico_set_boot_stage2 TARGET NAME)

src/rp2_common/pico_standard_link/binary_info.c

@@ -66,7 +66,13 @@ bi_decl(bi_program_url(PICO_PROGRAM_URL))
 #endif
 #endif
 
-#if !PICO_NO_BUILD_TYPE_FEATURE
+#if !PICO_NO_BI_BOOT2_NAME
+#ifdef PICO_BOOT2_NAME
+bi_decl(bi_string(BINARY_INFO_TAG_RASPBERRY_PI, BINARY_INFO_ID_RP_BOOT2_NAME, PICO_BOOT2_NAME))
+#endif
+#endif
+
+#if !PICO_NO_BI_BUILD_TYPE
 #ifdef PICO_CMAKE_BUILD_TYPE
 bi_decl(bi_program_build_attribute(PICO_CMAKE_BUILD_TYPE))
 #else