add arm m55 build tools

Author: zhangjipeng

tools/arm-cortex-m55/linker.ld

@@ -0,0 +1,58 @@
+MEMORY
+{
+  FLASH (rx)  : ORIGIN = 0x08000000, LENGTH = 2M
+  RAM (xrw)   : ORIGIN = 0x20000000, LENGTH = 128K
+}
+
+ENTRY(main)
+SECTIONS
+{
+  .text :
+  {
+    *(.vectors)
+    *(.text*)
+    *(.rodata*)
+  } > FLASH
+  .ARM.exidx :
+  {
+    . = ALIGN(4);
+    __exidx_start = .;
+    *(.ARM.exidx* .gnu.linkonce.armexidx.*)
+    . = ALIGN(4);
+    __exidx_end = .;
+  } > FLASH
+  .data :
+  {
+    . = ALIGN(4);
+    __data_start__ = .;
+    *(.data*)
+    . = ALIGN(4);
+    __data_end__ = .;
+  } > RAM AT > FLASH
+  .bss :
+  {
+    . = ALIGN(4);
+    __bss_start__ = .;
+    *(.bss*)
+    *(COMMON)
+    . = ALIGN(4);
+    __bss_end__ = .;
+  } > RAM
+  PROVIDE(end = __bss_end__);
+
+  .stack :
+  {
+    . = ALIGN(4);
+    . = . + 8K;
+    . = ALIGN(4);
+    _estack = .;
+  } > RAM
+  .heap :
+  {
+    . = ALIGN(4);
+    _sheap = .;
+    . = . + 32K;
+    . = ALIGN(4);
+    _eheap = .;
+  } > RAM
+}

tools/arm-cortex-m55/toolchain.cmake

@@ -0,0 +1,19 @@
+set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+set(CMAKE_C_COMPILER arm-none-eabi-gcc)
+set(CMAKE_CXX_COMPILER arm-none-eabi-g++)
+set(CMAKE_ASM_COMPILER arm-none-eabi-gcc)
+set(CPU_FLAGS "-mcpu=cortex-m55 -mfloat-abi=hard -mfpu=fpv5-sp-d16")
+set(CMAKE_C_FLAGS_INIT "${CPU_FLAGS}")
+set(CMAKE_CXX_FLAGS_INIT "${CPU_FLAGS}")
+set(CMAKE_ASM_FLAGS_INIT "${CPU_FLAGS}")
+set(LINKER_SCRIPT "linker.ld")
+set(THREADS_PTHREAD_ARG OFF)
+set(CMAKE_EXE_LINKER_FLAGS_INIT "-T ${LINKER_SCRIPT} --specs=nosys.specs")
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+set(BUILD_SHARED_LIBS OFF)
+set(gtest_disable_pthreads ON CACHE INTERNAL "")
+add_compile_options(-fno-exceptions -fno-rtti -fno-unwind-tables -g0 -ffunction-sections -fdata-sections)
+add_link_options(-Wl,--gc-sections)
+add_definitions(-D_POSIX_PATH_MAX=256 -D_POSIX_C_SOURCE=200809L -DGTEST_HAS_POSIX_RE=0 -DGTEST_HAS_STREAM_REDIRECTION=0 -DGTEST_OS_ESP8266=1)
+