[feat] prepare for boot2

example/boot2/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.10)
+
+include(proj.conf)
+
+project(${EXAMPLE_NAME} VERSION 0.1)
+add_executable(${EXAMPLE_NAME}.elf main.c)
+
+enable_language(ASM)
+target_sources(${EXAMPLE_NAME}.elf PUBLIC boot2_pre.S)
+
+add_subdirectory(${SDK_BASE_DIR} sdk)
+target_link_libraries(${EXAMPLE_NAME}.elf sdk)
+
+

example/boot2/Makefile

@@ -0,0 +1,20 @@
+EXAMPLE_BASE_DIR ?= $(shell realpath .)
+EXAMPLE_NAME := $(notdir $(patsubst %/,%,$(CURDIR)))
+SDK_BASE_DIR ?= $(shell realpath ./../..)
+
+export SDK_BASE_DIR
+export EXAMPLE_NAME
+export EXAMPLE_BASE_DIR
+
+GCC_PATH := $(shell which arm-none-eabi-gcc)
+CROSS_COMPILE := $(patsubst %gcc,%,$(GCC_PATH))
+ifeq ($(GCC_PATH),)
+$(error arm-none-eabi-gcc not found in PATH. Please install the ARM toolchain.)
+endif
+
+# add custom cmake definition
+#cmake_definition+=-Dxxx=sss
+
+LDFLAGS += -T$(EXAMPLE_BASE_DIR)/flash.ld
+
+include $(SDK_BASE_DIR)/project.build

example/boot2/boot2_pre.S

@@ -0,0 +1,21 @@
+.syntax unified
+.cpu cortex-m0plus
+.thumb
+
+.global  boot2_pre
+
+.section  .text.boot2_pre
+.type  boot2_pre, %function
+boot2_pre:
+    b boot2_copy_self
+    .word 0x11223344
+    .word 0xabcdef58
+
+
+
+boot2_copy_self:
+
+
+    bl main
+
+.size  .boot2_pre, .-boot2_pre

example/boot2/flash.ld

@@ -0,0 +1,62 @@
+_start = ORIGIN(FLASH);
+ENTRY(_start)
+
+MEMORY
+{
+    FLASH (xrx)      :ORIGIN = 0x10000000, LENGTH = 256K
+    RAM (xrw)        :ORIGIN = 0x20000000, LENGTH = 256K
+    STACK (rw)       :ORIGIN = 0x20040000, LENGTH = 8K - 256
+    AUTO(xrx)        :ORIGIN = 0x20041F00, LENGTH = 256
+}
+
+_stack_top = ORIGIN(STACK) + LENGTH(STACK);
+
+PHDRS
+{
+    boot2_pre PT_LOAD FLAGS(5); /* R + X */
+    text PT_LOAD FLAGS(5);      /* R + X */
+    rodata PT_LOAD FLAGS(5);    /* R + W */
+    data PT_LOAD FLAGS(6);      /* R + W */
+    bss PT_LOAD FLAGS(6);       /* R + W */
+}
+
+SECTIONS
+{
+    .boot2_pre :
+    {
+        KEEP(*(.text.boot2_pre))
+        _boot2_pre_size = . - ADDR(.boot2_pre);
+        ASSERT(_boot2_pre_size <= 252, "Error: .boot2_pre size exceeds 252 bytes!");
+        . += 256 - _boot2_pre_size;
+    } >AUTO AT > FLASH :boot2_pre
+
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)
+        . = ALIGN(4);
+    } >RAM AT > FLASH :text
+
+    .rodata :
+    {
+        . = ALIGN(4);
+        *(.rodata*)
+        . = ALIGN(4);
+    } >RAM AT > FLASH :rodata
+
+    .data :
+    {
+        . = ALIGN(4);
+        *(.data*)
+        . = ALIGN(4);
+    } >RAM AT > FLASH :data
+
+    .bss (NOLOAD) :
+    {
+        . = ALIGN(4);
+        _bss_start = .;
+        *(.bss*)
+        . = ALIGN(4);
+        _bss_end = .;
+    } >RAM :bss
+}

example/boot2/main.c

@@ -0,0 +1,4 @@
+int main(void)
+{
+    return 0;
+}

example/boot2/proj.conf

@@ -0,0 +1 @@
+# set(CONFIG_COMPONENT1 1)

project.build

@@ -11,6 +11,9 @@ CFLAGS += -ffunction-sections
 CFLAGS += -fdata-sections
 CFLAGS += -Wpointer-arith
 
+ifneq ($(findstring -T, $(LDFLAGS)), -T)
+LDFLAGS += -T$(SDK_BASE_DIR)/ram.ld
+endif
 LDFLAGS += -mcpu=cortex-m0plus
 LDFLAGS += -mthumb
 LDFLAGS += -g3
@@ -18,11 +21,11 @@ LDFLAGS += -O2
 LDFLAGS += -Wall
 LDFLAGS += -Wl,--gc-sections
 LDFLAGS += -nostartfiles
-LDFLAGS += -T$(SDK_BASE_DIR)/ram.ld
 LDFLAGS += -Wl,-Map=$(EXAMPLE_NAME).map
 LDFLAGS += -Wl,--print-memory-usage
 
 CMAKE := cmake
+ELF2UF2 := $(SDK_BASE_DIR)/tools/elf2uf2
 
 # The command to remove a file.
 RM = $(CMAKE) -E remove_directory
@@ -55,8 +58,10 @@ build:Makefile
 	$(MAKE) -C build -j
 	$(CROSS_COMPILE)objcopy -O binary $(FINAL_NAME_PRE).elf $(FINAL_NAME_PRE).bin
 	$(CROSS_COMPILE)objdump -d -S $(FINAL_NAME_PRE).elf > $(FINAL_NAME_PRE).asm
+	$(CROSS_COMPILE)nm $(FINAL_NAME_PRE).elf > $(FINAL_NAME_PRE).nm
+	$(ELF2UF2) $(FINAL_NAME_PRE).elf $(FINAL_NAME_PRE).uf2
 	size $(FINAL_NAME_PRE).elf
-	sha256sum $(FINAL_NAME_PRE).elf
+	sha256sum $(FINAL_NAME_PRE).bin
 
 clean::
 	$(RM) build