Index: boot/arch/ia64/Makefile.inc
===================================================================
--- boot/arch/ia64/Makefile.inc	(revision c631734dadf94732aebdff5d84a80b87e470fee1)
+++ boot/arch/ia64/Makefile.inc	(revision 7b884e55f09afb9c7f129313061ffae725d7e03b)
@@ -66,4 +66,5 @@
 endif
 
+ifeq ($(MACHINE),i460GX)
 RD_DRVS_ESSENTIAL += \
 	platform/pc \
@@ -88,4 +89,11 @@
 RD_DRV_CFG += \
 	bus/isa
+endif
+
+ifeq ($(MACHINE),ski)
+RD_DRVS_ESSENTIAL += \
+	char/ski-con \
+	platform/ski
+endif
 
 PRE_DEPEND = $(COMPS).s $(COMPS).h $(COMPS)_desc.c $(COMPONENTS_DEFLATE)