Updated build tools.

README.md

@@ -24,6 +24,13 @@ have a 32 bit (single precision) FPU. E.g. ARM Cortex M4 or better.
   * STM32F4Discovery Board (MB997) http://www.st.com/en/evaluation-tools/stm32f4discovery.html
   * MIDI to serial breakout board http://ubld.it/products/midi-breakout-board/
 
+## Build tools:
+* [GNU Make](https://www.gnu.org/software/make/)
+* [GNU Embedded Toolchain for ARM](https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads)
+* [STLink Device Programming Tool](https://github.com/texane/stlink)
+
+The path to the GNU cross compilation tools is set in ./mk/common.mk
+
 ## Source Layout
  * common - common souces (target/SoC independent)
  * drivers - device drivers (non SoC)

mk/common.mk

@@ -3,9 +3,15 @@
 HOST_GCC = gcc
 
 # cross compilation tools
-XTOOLS_DIR = /opt/gcc-arm-none-eabi-5_4-2016q2
+
+# set the path
+XTOOLS_DIR = /opt/gcc-arm-none-eabi-7-2017-q4-major
+
+# set the version
+X_LIBGCC_DIR = $(XTOOLS_DIR)/lib/gcc/arm-none-eabi/7.2.1/armv7e-m/fpu
+
+# should be ok
 X_LIBC_DIR = $(XTOOLS_DIR)/arm-none-eabi/lib/armv7e-m/fpu
-X_LIBGCC_DIR = $(XTOOLS_DIR)/lib/gcc/arm-none-eabi/5.4.1/armv7e-m/fpu
 X_GCC = $(XTOOLS_DIR)/bin/arm-none-eabi-gcc
 X_OBJCOPY = $(XTOOLS_DIR)/bin/arm-none-eabi-objcopy
 X_AR = $(XTOOLS_DIR)/bin/arm-none-eabi-ar