Merge pull request micropython#1087 from dhalbert/increase-dyn-stack-size

increase new dynamic stack size to a comfortable value for now

Author: tannewt

ports/atmel-samd/mpconfigport.h

@@ -340,6 +340,6 @@ void run_background_tasks(void);
 
 // TODO(tannewt): Make this 6k+ for any non-express M4 boards because they cache sectors on the
 // stack.
-#define CIRCUITPY_DEFAULT_STACK_SIZE 2048
+#define CIRCUITPY_DEFAULT_STACK_SIZE 4096
 
 #endif  // __INCLUDED_MPCONFIGPORT_H

ports/nrf/mpconfigport.h

@@ -242,6 +242,6 @@ void run_background_tasks(void);
 #define MICROPY_VM_HOOK_RETURN  run_background_tasks();
 
 //#define CIRCUITPY_BOOT_OUTPUT_FILE "/boot_out.txt"
-#define CIRCUITPY_DEFAULT_STACK_SIZE 2048
+#define CIRCUITPY_DEFAULT_STACK_SIZE 4096
 
 #endif