zephyr: Remove deprecated .mdef file.

zephyr/Makefile.zephyr

@@ -18,7 +18,6 @@ KERNEL_TYPE = micro
 # BOARD must be passed on command line from main Makefile
 #BOARD =
 CONF_FILE = prj.conf
-MDEF_FILE = prj.mdef
 
 #export SOURCE_DIR = $(ZEPHYR_BASE)/samples/static_lib/hello_world
 export LDFLAGS_zephyr += -L$(CURDIR)

zephyr/main.c

@@ -64,8 +64,8 @@ int real_main(void) {
     int stack_dummy;
     stack_top = (char*)&stack_dummy;
     mp_stack_set_top(stack_top);
-    // Should be set to stack size in prj.mdef minus fuzz factor
-    mp_stack_set_limit(3584);
+    // Make MicroPython's stack limit somewhat smaller than full stack available
+    mp_stack_set_limit(CONFIG_MAIN_STACK_SIZE - 512);
 
 soft_reset:
     #if MICROPY_ENABLE_GC

zephyr/prj.conf

@@ -3,3 +3,4 @@ CONFIG_CONSOLE_HANDLER=y
 CONFIG_UART_CONSOLE_DEBUG_SERVER_HOOKS=y
 CONFIG_NEWLIB_LIBC=y
 CONFIG_FLOAT=y
+CONFIG_MAIN_STACK_SIZE=4096

zephyr/prj.mdef

@@ -1,5 +0,0 @@
-% Application       : MicroPython
-
-% TASK NAME  PRIO ENTRY STACK GROUPS
-% ==================================
-  TASK MAIN  7    main  4096 [EXE]