Add the possibility to create .o files from arbitrary binary blobs.

src/Makefile.housekeeping

@@ -409,6 +409,15 @@ allpxes allisos alldsks : all%s : $(foreach DRIVER,$(DRIVERS),$(BIN)/$(DRIVER).%
 $(BIN)/etherboot.% : $(BIN)/gpxe.%
 	ln -sf $(notdir $<) $@
 
+# Wrap up binary blobs
+#
+$(BIN)/%.o : payload/%.img
+	$(QM)echo "  [WRAP] $@"
+	$(Q)$(LD) -b binary -r -o $@ $< --undefined obj_payload \
+		--defsym obj_$*=0
+
+BOBJS += $(patsubst payload/%.img,$(BIN)/%.o,$(wildcard payload/*.img))
+
 # The compression utilities
 #
 $(NRV2B) : util/nrv2b.c $(MAKEDEPS)

src/payload/hello.img

@@ -0,0 +1 @@
+hello world!