diff --git a/CONF.sh b/CONF.sh
index db211888..d695c974 100644
--- a/CONF.sh
+++ b/CONF.sh
@@ -261,3 +261,7 @@ export PUBLISH_PATH="/home/jigdo-area/"
 # INSTALLER_CD=1: just add debian-installer (use TASK=tasks/debian-installer)
 # INSTALLER_CD=2: add d-i and base (use TASK=tasks/debian-installer+kernel)
 #export INSTALLER_CD=0
+
+# Parameters to pass to kernel when the CD boots. Not currently supported
+# for all architectures.
+#export KERNEL_PARAMS="DEBCONF_PRIORITY=critical"
diff --git a/tools/boot/sarge/boot-i386 b/tools/boot/sarge/boot-i386
index 4decdb1f..8bd23b5c 100755
--- a/tools/boot/sarge/boot-i386
+++ b/tools/boot/sarge/boot-i386
@@ -121,22 +121,21 @@ if [ -e boot$N/isolinux/f3.txt.with26 ];then
   done
   cp -a cdrom/2.6 $CDDIR/install/2.6
 # Isolinux config file.
-cat > boot$N/isolinux/isolinux.cfg <<EOF
-DEFAULT /install/vmlinuz
-APPEND vga=normal initrd=/install/initrd.gz ramdisk_size=10240 root=/dev/rd/0 init=/linuxrc devfs=mount,dall rw DEBCONF_PRIORITY=critical
+sed s/\$KERNEL_PARAMS/$KERNEL_PARAMS/g' > boot$N/isolinux/isolinux.cfg <<EOF
+DEFAULT /install/vmlinuz APPEND $KERNEL_PARAMS vga=normal initrd=/install/initrd.gz ramdisk_size=10240 root=/dev/rd/0 init=/linuxrc devfs=mount,dall rw
 LABEL linux
   kernel /install/vmlinuz
 LABEL cdrom
   kernel /install/vmlinuz
 LABEL linux26
   kernel /install/2.6/vmlinuz
-APPEND vga=normal initrd=/install/2.6/initrd.gz ramdisk_size=10240 root=/dev/rd/0 init=/linuxrc devfs=mount,dall rw
+APPEND $KERNEL_PARAMS vga=normal initrd=/install/2.6/initrd.gz ramdisk_size=10240 root=/dev/rd/0 init=/linuxrc devfs=mount,dall rw
 LABEL expert
   kernel /install/vmlinuz
-  append DEBCONF_PRIORITY=low vga=normal initrd=/install/initrd.gz ramdisk_size=10240 root=/dev/rd/0 init=/linuxrc devfs=mount,dall rw
+  append $KERNEL_PARAMS DEBCONF_PRIORITY=low vga=normal initrd=/install/initrd.gz ramdisk_size=10240 root=/dev/rd/0 init=/linuxrc devfs=mount,dall rw
 LABEL expert26
   kernel /install/2.6/vmlinuz
-  append DEBCONF_PRIORITY=low vga=normal initrd=/install/2.6/initrd.gz ramdisk_size=10240 root=/dev/rd/0 init=/linuxrc devfs=mount,dall rw
+  append $KERNEL_PARAMS DEBCONF_PRIORITY=low vga=normal initrd=/install/2.6/initrd.gz ramdisk_size=10240 root=/dev/rd/0 init=/linuxrc devfs=mount,dall rw
 DISPLAY isolinux.txt
 TIMEOUT 0
 PROMPT 1