add boot driver option - like the normal driver, but less header?

Makefile

@@ -6,7 +6,7 @@ ASMFLAGS=-case on -l
 LDFLAGS=
 
 
-all : host.driver host.fst boot.sys
+all : host.driver boot.driver host.fst boot.sys
 
 host.fst : host.fst.o
 	$(LD) -t \$$BD -at \$$0000 $< -o $@
@@ -18,7 +18,15 @@ host.fst : host.fst.o
 host.driver : host.driver.o
 	$(LD) -t \$$BB -at \$$0101 $< -o $@
 
+boot.driver : boot.driver.o
+	$(LD) -t \$$BB -at \$$0181 $< -o $@
+
+# -d BootDriver must come after -case on
 host.driver.o : host.driver.aii gsos.equ
+boot.driver.o : host.driver.aii gsos.equ
+	$(ASM) $(ASMFLAGS) -d BootDriver $< -o $@
+
+
 
 host.fst.o : host.fst.aii gsos.equ fst.equ records.equ fst.macros
 
@@ -30,7 +38,7 @@ boot.sys: boot
 
 .PHONY : clean
 clean :
-	$(RM) -- host.fst host.driver boot.sys boot *.o
+	$(RM) -- host.fst host.driver boot.driver boot.sys boot *.o
 
 %.o : %.aii
 	$(ASM) $(ASMFLAGS) $< -o $@

gsos.equ

@@ -10,6 +10,7 @@
 	; ` prevents expansion during macro processing.
 	DEFAULT `DEBUG_S16,0
 	DEFAULT `DebugSymbols,0
+	DEFAULT `BootDriver,0
 
 ****************************************************************
 *

host.driver.aii

@@ -10,10 +10,11 @@
 
 		string asis
 header		proc
+		if not BootDriver then
 		dc.w dib-header
 		dc.w 1				; 1 device
 		dc.w 0				; no config list
-
+		endif
 
 dib		dc.l	0			;Link pointer to next DIB
 		dc.l	entry			;Entry pointer