stm32loader.py: Improve error message on failed init.

Signed-off-by: Marti Bolivar <[email protected]>

Author: Marti Bolivar

support/stm32loader.py

@@ -448,7 +448,7 @@ def read(filename):
         try:
             cmd.initChip()
         except CmdException:
-            print("Can't init. Ensure that BOOT0 is enabled and reset device")
+            print("Can't init. Ensure BOOT0=1, BOOT1=0, and reset device")
 
         bootversion = cmd.cmdGet()