Add simulation info for SimulAVR.

This shouldn't change the running binary at all, so it shouldn't
harm. However, it allows to run Teacup inside SimulAVR and accessing
Teacups' serial line through the console/terminal.

For detailed instructions, see http://reprap.org/wiki/SimulAVR .

Makefile-AVR

@@ -127,7 +127,14 @@ CFLAGS += -finline-functions-called-once
 CFLAGS += -mcall-prologues
 
 LDFLAGS  = -Wl,--as-needed
-LDFLAGS += -Wl,--gc-sections
+# Doesn't work for simulavr, can't allow dead code removal.
+#LDFLAGS += -Wl,--gc-sections
+
+ifneq ($(realpath ../simulavr/src/simulavr_info.h),)
+  # Neccessary for simulavr support, doesn't hurt others.
+  CFLAGS += -DSIMINFO
+  LDFLAGS += -Wl,--section-start=.siminfo=0x900000
+endif
 
 LIBS  = -lm
 

mendel.c

@@ -50,6 +50,14 @@
 #include	"intercom.h"
 #include "simulator.h"
 
+#ifdef SIMINFO
+  #include "../simulavr/src/simulavr_info.h"
+  SIMINFO_DEVICE("atmega644");
+  SIMINFO_CPUFREQUENCY(F_CPU);
+  SIMINFO_SERIAL_IN("D0", "-", BAUD);
+  SIMINFO_SERIAL_OUT("D1", "-", BAUD);
+#endif
+
 /// initialise all I/O - set pins as input or output, turn off unused subsystems, etc
 void io_init(void) {
 	// disable modules we don't use