Re-organize C sources and build process

Author: dalnefre

Makefile

@@ -2,26 +2,33 @@
 # Makefile for pijFORTHos -- Raspberry Pi JonesFORTH Operating System
 #
 
-COPTS = -g -Wall -O2 -nostdlib -nostartfiles -ffreestanding
+AS=	as
+CC=	gcc -g -Wall -O2 -nostdlib -nostartfiles -ffreestanding
+LD=	ld
+
+KOBJS=	start.o jonesforth.o raspberry.o timer.o serial.o xmodem.o
 
 all: kernel.img
 
 start.o: start.s
-	as start.s -o start.o
+	$(AS) start.s -o start.o
 
 jonesforth.o: jonesforth.s
-	as jonesforth.s -o jonesforth.o
+	$(AS) jonesforth.s -o jonesforth.o
 
-raspberry.o: raspberry.c
-	gcc $(COPTS) -c raspberry.c -o raspberry.o
+#raspberry.o: raspberry.c
+#	$(CC) -c raspberry.c -o raspberry.o
 
-kernel.img: loadmap start.o jonesforth.o raspberry.o 
-	ld start.o jonesforth.o raspberry.o -T loadmap -o pijFORTHos.elf
+kernel.img: loadmap $(KOBJS)
+	$(LD) $(KOBJS) -T loadmap -o pijFORTHos.elf
 	objdump -D pijFORTHos.elf > pijFORTHos.list
 	objcopy pijFORTHos.elf -O ihex pijFORTHos.hex
 	objcopy --only-keep-debug pijFORTHos.elf kernel.sym
 	objcopy pijFORTHos.elf -O binary kernel.img
 
+.c.o:
+	$(CC) -c $<
+
 clean:
 	rm -f *.o
 	rm -f *.bin