Added experimental Maple RET6 board for @skyng22003

Author: rogerclarkmelbourne

STM32F1/boards.txt

@@ -94,6 +94,35 @@ maple.build.error_led_pin=5
 maple.build.gcc_ver=gcc-arm-none-eabi-4.8.3-2014q1
 
 
+##############################################################
+mapleRET6.name=LeafLabs Maple RET6 to Flash
+
+mapleRET6.upload.tool=maple_upload
+mapleRET6.upload.protocol=maple_dfu
+mapleRET6.upload.maximum_size=492000
+mapleRET6.upload.use_1200bps_touch=false
+mapleRET6.upload.file_type=bin
+mapleRET6.upload.ram.maximum_size=61000
+mapleRET6.upload.flash.maximum_size=492000
+mapleRET6.upload.usbID=1EAF:0003
+mapleRET6.upload.altID=1
+mapleRET6.upload.auto_reset=true
+
+mapleRET6.build.mcu=cortex-m3
+mapleRET6.build.f_cpu=72000000L
+mapleRET6.build.board=MAPLE_RET6
+mapleRET6.build.core=maple
+mapleRET6.build.extra_flags=-DMCU_STM32F103RE -mthumb -DBOOTLOADER_maple -march=armv7-m -D__STM32F1__
+
+mapleRET6.build.ldscript=ld/flashRET6.ld
+mapleRET6.build.variant=maple
+mapleRET6.build.variant_system_lib=libmapleRET6.a
+mapleRET6.build.vect=VECT_TAB_FLASH
+mapleRET6.build.density=STM32_HIGH_DENSITY
+mapleRET6.build.error_led_port=GPIOA
+mapleRET6.build.error_led_pin=5
+mapleRET6.build.gcc_ver=gcc-arm-none-eabi-4.8.3-2014q1
+
 ##############################################################
 genericSTM32.name=STM32 to Flash - No bootloader
 

STM32F1/variants/maple/ld/flashRET6.ld

@@ -0,0 +1,30 @@
+/*
+ * libmaple linker script for "Flash" builds.
+ *
+ * A Flash build puts .text (and .rodata) in Flash, and
+ * .data/.bss/heap (of course) in SRAM, but offsets the sections by
+ * enough space to store the Maple bootloader, which lives in low
+ * Flash and uses low memory.
+ */
+
+/*
+ * This pulls in the appropriate MEMORY declaration from the right
+ * subdirectory of stm32/mem/ (the environment must call ld with the
+ * right include directory flags to make this happen). Boards can also
+ * use this file to use any of libmaple's memory-related hooks (like
+ * where the heap should live).
+ */
+MEMORY
+{
+ram (rwx) : ORIGIN = 0x20000C00, LENGTH = 61K
+rom (rx) : ORIGIN = 0x08005000, LENGTH = 492K
+}
+
+/* Provide memory region aliases for common.inc */
+REGION_ALIAS("REGION_TEXT", rom);
+REGION_ALIAS("REGION_DATA", ram);
+REGION_ALIAS("REGION_BSS", ram);
+REGION_ALIAS("REGION_RODATA", rom);
+
+/* Let common.inc handle the real work. */
+INCLUDE common.inc