core-$(CONFIG_IA64_DIG) += arch/ia64/dig/
core-$(CONFIG_IA64_GENERIC) += arch/ia64/dig/
core-$(CONFIG_IA64_HP_ZX1) += arch/ia64/dig/
-core-$(CONFIG_IA64_SGI_SN2) += arch/ia64/sn/
-
+ifeq ($(CONFIG_DISCONTIGMEM),y)
+ core-$(CONFIG_IA64_SGI_SN2) += arch/ia64/sn/
+endif
drivers-$(CONFIG_PCI) += arch/ia64/pci/
drivers-$(CONFIG_IA64_HP_SIM) += arch/ia64/hp/sim/
drivers-$(CONFIG_IA64_HP_ZX1) += arch/ia64/hp/common/ arch/ia64/hp/zx1/
-drivers-$(CONFIG_IA64_GENERIC) += arch/ia64/hp/common/ arch/ia64/hp/zx1/ arch/ia64/hp/sim/ arch/ia64/sn/
+drivers-$(CONFIG_IA64_GENERIC) += arch/ia64/hp/common/ arch/ia64/hp/zx1/ arch/ia64/hp/sim/
+ifeq ($(CONFIG_DISCONTIGMEM),y)
+drivers-$(CONFIG_IA64_GENERIC) += arch/ia64/sn/
+endif
drivers-$(CONFIG_OPROFILE) += arch/ia64/oprofile/
boot := arch/ia64/hp/sim/boot