Target and makefile cleanup

Makefile

@@ -52,16 +52,14 @@ $(BUILD)/tetros.elf: $(BUILD)/tetros.lib $(BIOS_LD)
 # Wrap tetros in three-stage BIOS loader
 # Parameters:
 # - BIOS_SRC: source directory of bios assembly
-# - STAGE3: path to linked stage 3 binary
 # - STAGE2_SECTOR: the index of the first sector of the stage 2 binary on the disk
 BIOS_SRC = ./bios
-STAGE2_SECTOR = 5
-STAGE3 = $(BUILD)/tetros.elf 
-$(BUILD)/bios.bin: $(wildcard $(BIOS_SRC)/*.asm) $(STAGE3)
+STAGE2_SECTOR = 1
+$(BUILD)/bios.bin: $(wildcard $(BIOS_SRC)/*.asm) $(BUILD)/tetros.elf 
 	@mkdir -p "$(BUILD)"
 	nasm \
 		-f bin \
-		-D STAGE3=$(STAGE3) \
+		-D STAGE3=$(BUILD)/tetros.elf \
 		-D STAGE2_SECTOR=$(STAGE2_SECTOR) \
 		-o "$@" \
 		-l "$@.lst" \
@@ -92,8 +90,9 @@ $(BUILD)/disk.img: $(BUILD)/mbr.bin $(BUILD)/stage2.bin
 	@echo ""
 	dd if=/dev/zero of=$@ bs=512 count=32
 	dd if="$(BUILD)/mbr.bin" of=$@ conv=notrunc bs=512
-	dd if="$(BUILD)/stage2.bin" of=$@ conv=notrunc seek=5 bs=512
+	dd if="$(BUILD)/stage2.bin" of=$@ conv=notrunc seek=$(STAGE2_SECTOR) bs=512
 
+.PHONY: qemu
 qemu: $(BUILD)/disk.img
 	qemu-system-i386 \
 		-d cpu_reset \
@@ -103,6 +102,20 @@ qemu: $(BUILD)/disk.img
 		-net none \
 		-serial stdio \
 		-fda "$<"
+
+# Same as qemu, but with no dependency.
+# Used for remote dev, where build box != run box.
+.PHONY: qemu-remote
+qemu-remote:
+	qemu-system-i386 \
+		-d cpu_reset \
+		-no-reboot \
+		-smp 1 -m 2048 \
+		-machine q35 \
+		-net none \
+		-serial stdio \
+		-fda "$(BUILD)/disk.img"
+
 # -gdb tcp::26000 \
 # -S
 # -enable-kvm \