software: use a single crt0 (deprecate crt0-ctr/crt0-xip) and avoid unnecessary defines.

Since https://github.com/enjoy-digital/litex/issues/566, crt0-ctr and crt0-xip are now similiar
so we can get back to a single crt0 and remove the defines that were generated to distinguish
the different cases.

Since LiteX/MiSoC have diverged and are no longer compatible, we also no longer need to generate
the LiteX flag.

litex/soc/integration/builder.py

@@ -91,20 +91,6 @@ class Builder:
 
             for k, v in export.get_cpu_mak(self.soc.cpu, self.compile_software):
                 define(k, v)
-            # Distinguish between LiteX and MiSoC.
-            define("LITEX", "1")
-            # Distinguish between applications running from main RAM and
-            # flash for user-provided software packages.
-            exec_profiles = {
-                "COPY_TO_MAIN_RAM" : "0",
-                "EXECUTE_IN_PLACE" : "0"
-            }
-            if "main_ram" in self.soc.mem_regions.keys():
-                exec_profiles["COPY_TO_MAIN_RAM"] = "1"
-            else:
-                exec_profiles["EXECUTE_IN_PLACE"] = "1"
-            for k, v in exec_profiles.items():
-                define(k, v)
             define(
                 "COMPILER_RT_DIRECTORY",
                 get_data_mod("software", "compiler_rt").data_location)

litex/soc/software/bios/Makefile

@@ -58,7 +58,7 @@ endif
 bios.elf: $(BIOS_DIRECTORY)/linker.ld $(OBJECTS)
 
 
-%.elf: ../libbase/crt0-ctr.o \
+%.elf: ../libbase/crt0.o \
 	../libcompiler_rt/libcompiler_rt.a \
 	../libbase/libbase-nofloat.a \
 	../liblitedram/liblitedram.a \
@@ -66,7 +66,7 @@ bios.elf: $(BIOS_DIRECTORY)/linker.ld $(OBJECTS)
 	../liblitespi/liblitespi.a \
 	../liblitesdcard/liblitesdcard.a
 	$(LD) $(LDFLAGS) -T $(BIOS_DIRECTORY)/linker.ld -N -o $@ \
-		../libbase/crt0-ctr.o \
+		../libbase/crt0.o \
 		$(OBJECTS) \
 		-L../libcompiler_rt \
 		-L../libbase \

litex/soc/software/libbase/Makefile

@@ -1,11 +1,25 @@
 include ../include/generated/variables.mak
 include $(SOC_DIRECTORY)/software/common.mak
 
-OBJECTS = exception.o libc.o errno.o crc16.o crc32.o console.o \
-	system.o id.o uart.o time.o qsort.o strtod.o spiflash.o strcasecmp.o i2c.o \
-	div64.o progress.o
+OBJECTS = exception.o \
+	libc.o            \
+	errno.o           \
+	crc16.o           \
+	crc32.o           \
+	console.o         \
+	system.o          \
+	id.o              \
+	uart.o            \
+	time.o            \
+	qsort.o           \
+	strtod.o          \
+	spiflash.o        \
+	strcasecmp.o      \
+	i2c.o             \
+	div64.o           \
+	progress.o
 
-all: crt0-ctr.o crt0-xip.o libbase.a libbase-nofloat.a
+all: crt0.o libbase.a libbase-nofloat.a
 
 libbase.a: $(OBJECTS) vsnprintf.o
 	$(AR) crs libbase.a $(OBJECTS) vsnprintf.o
@@ -25,14 +39,11 @@ vsnprintf-nofloat.o: $(LIBBASE_DIRECTORY)/vsnprintf.c
 %.o: $(LIBBASE_DIRECTORY)/%.S
 	$(assemble)
 
-crt0-ctr.o: $(CPU_DIRECTORY)/crt0.S
+crt0.o: $(CPU_DIRECTORY)/crt0.S
 	$(assemble)
 
-crt0-xip.o: $(CPU_DIRECTORY)/crt0.S
-	$(CC) -c -DEXECUTE_IN_PLACE $(CFLAGS) -o $@ $<
-
 .PHONY: all clean
 
 clean:
-	$(RM) $(OBJECTS) crt0-$(CPU).o crt0-$(CPU)-flash.o vsnprintf.o vsnprintf-nofloat.o
+	$(RM) $(OBJECTS) crt0.o vsnprintf.o vsnprintf-nofloat.o
 	$(RM) libbase.a libbase-nofloat.a .*~ *~