diff --git a/sys/alpha/conf/DEFAULTS b/sys/alpha/conf/DEFAULTS
new file mode 100644
index 00000000000..c199be22969
--- /dev/null
+++ b/sys/alpha/conf/DEFAULTS
@@ -0,0 +1,10 @@
+#
+# DEFAULTS -- Default kernel configuration file for FreeBSD/alpha
+#
+# $FreeBSD$
+
+# Not yet, this would break all existing configs
+#machine		alpha
+
+# Pseudo devices.
+device		mem		# Memory and kernel memory devices
diff --git a/sys/alpha/conf/GENERIC b/sys/alpha/conf/GENERIC
index 2be16f3b2c2..cab4e453e69 100644
--- a/sys/alpha/conf/GENERIC
+++ b/sys/alpha/conf/GENERIC
@@ -183,7 +183,6 @@ device		xl		# 3Com 3c90x (``Boomerang'', ``Cyclone'')
 
 # Pseudo devices.
 device		loop		# Network loopback
-device		mem		# Memory and kernel memory devices
 device		random		# Entropy device
 device		ether		# Ethernet support
 device		sl		# Kernel SLIP
diff --git a/sys/ia64/conf/DEFAULTS b/sys/ia64/conf/DEFAULTS
new file mode 100644
index 00000000000..331061d78e4
--- /dev/null
+++ b/sys/ia64/conf/DEFAULTS
@@ -0,0 +1,13 @@
+#
+# DEFAULTS -- Default kernel configuration file for FreeBSD/ia64
+#
+# $FreeBSD$
+
+# Not yet, this would break all existing configs
+#machine		ia64
+
+# Bus support.
+device 		acpi		# ACPI support
+
+# Pseudo devices.
+device		mem		# Memory and kernel memory devices
diff --git a/sys/ia64/conf/GENERIC b/sys/ia64/conf/GENERIC
index 560e92d449c..2e457ab0bdc 100644
--- a/sys/ia64/conf/GENERIC
+++ b/sys/ia64/conf/GENERIC
@@ -56,7 +56,6 @@ options 	UFS_DIRHASH	# Hash-based directory lookup scheme
 options 	_KPOSIX_PRIORITY_SCHEDULING	# Posix P1003_1B RT extensions
 
 # Various "busses"
-device 		acpi		# ACPI support (mandatory)
 device		firewire	# FireWire bus code
 device		miibus		# MII bus support (Ethernet)
 device		pci		# PCI bus support
@@ -141,7 +140,6 @@ device		faith		# IPv6-to-IPv4 relaying (translation)
 device		gif		# IPv6 and IPv4 tunneling
 device		loop		# Network loopback
 device		md		# Memory "disks"
-device		mem		# Memory and kernel memory devices
 device		pty		# Pseudo-ttys (telnet etc)
 device		puc		# Multi I/O cards and multi-channel UARTs
 device		random		# Entropy device
diff --git a/sys/powerpc/conf/DEFAULTS b/sys/powerpc/conf/DEFAULTS
new file mode 100644
index 00000000000..bd4ddb894a1
--- /dev/null
+++ b/sys/powerpc/conf/DEFAULTS
@@ -0,0 +1,10 @@
+#
+# DEFAULTS -- Default kernel configuration file for FreeBSD/powerpc
+#
+# $FreeBSD$
+
+# Not yet, this would break all existing configs
+#machine		powerpc
+
+# Pseudo devices.
+device		mem		# Memory and kernel memory devices
diff --git a/sys/powerpc/conf/GENERIC b/sys/powerpc/conf/GENERIC
index 53ca3dfb5f4..3dfd5db459a 100644
--- a/sys/powerpc/conf/GENERIC
+++ b/sys/powerpc/conf/GENERIC
@@ -104,7 +104,6 @@ device 		fxp		# Intel EtherExpress PRO/100B (82557, 82558)
 
 # Pseudo devices.
 device		loop		# Network loopback
-device		mem		# Memory and kernel memory devices
 device		random		# Entropy device
 device		ether		# Ethernet support
 device		sl		# Kernel SLIP
diff --git a/sys/sparc64/conf/DEFAULTS b/sys/sparc64/conf/DEFAULTS
new file mode 100644
index 00000000000..087ee1d49bc
--- /dev/null
+++ b/sys/sparc64/conf/DEFAULTS
@@ -0,0 +1,10 @@
+#
+# DEFAULTS -- Default kernel configuration file for FreeBSD/sparc64
+#
+# $FreeBSD$
+
+# Not yet, this would break all existing configs
+#machine		sparc64
+
+# Pseudo devices.
+device		mem		# Memory and kernel memory devices
diff --git a/sys/sparc64/conf/GENERIC b/sys/sparc64/conf/GENERIC
index 73a13c1803c..84968dd7fd2 100644
--- a/sys/sparc64/conf/GENERIC
+++ b/sys/sparc64/conf/GENERIC
@@ -186,7 +186,6 @@ device		xl		# 3Com 3c90x (``Boomerang'', ``Cyclone'')
 
 # Pseudo devices.
 device		loop		# Network loopback
-device		mem		# Memory and kernel memory devices
 device		random		# Entropy device
 device		ether		# Ethernet support
 device		sl		# Kernel SLIP