use blue pill as devboard and stlinkv2 as flasher

Rakefile

@@ -15,7 +15,7 @@ FIRMWARES = [BOOTLOADER, APPLICATION]
 
 # which development board is used
 # supported are: SYSTEM_BOARD, MAPLE_MINI, BLUE_PILL, CORE_BOARD, BUSVOODOO
-BOARD = ENV["BOARD"] || "CORE_BOARD"
+BOARD = ENV["BOARD"] || "BLUE_PILL"
 
 # libopencm3 definitions
 LIBOPENCM3_DIR = "libopencm3"
@@ -183,7 +183,7 @@ end
 
 # SWD/JTAG adapter used
 # supported are : STLINKV2 (ST-Link V2), BMP (Black Magic Probe)
-SWD_ADAPTER = ENV["SWD_ADAPTER"] || "BMP"
+SWD_ADAPTER = ENV["SWD_ADAPTER"] || "STLINKV2"
 # openOCD path to control the adapter
 OOCD = ENV["OOCD"] || "openocd"
 # openOCD adapted name