diff --git a/meta/classes/boot-directdisk.bbclass b/meta/classes/boot-directdisk.bbclass
index c6ada47479..46f88ac9bf 100644
--- a/meta/classes/boot-directdisk.bbclass
+++ b/meta/classes/boot-directdisk.bbclass
@@ -59,7 +59,6 @@ inherit ${EFI_CLASS}
 
 DISK_SIGNATURE ?= "${DISK_SIGNATURE_GENERATED}"
 ROOT_VM ?= "root=/dev/sda2"
-SYSLINUX_CFG_VM  ?= "${S}/syslinux_vm.cfg"
 
 boot_direct_populate() {
 	dest=$1
diff --git a/meta/classes/bootimg.bbclass b/meta/classes/bootimg.bbclass
index 70ce07032b..d9ed7dbbdb 100644
--- a/meta/classes/bootimg.bbclass
+++ b/meta/classes/bootimg.bbclass
@@ -40,6 +40,11 @@ EFIIMGDIR = "${S}/efi_img"
 COMPACT_ISODIR = "${S}/iso.z"
 COMPRESSISO ?= "0"
 
+ISOLINUXDIR ?= "/isolinux"
+ISO_BOOTIMG = "isolinux/isolinux.bin"
+ISO_BOOTCAT = "isolinux/boot.cat"
+MKISOFS_OPTIONS = "-no-emul-boot -boot-load-size 4 -boot-info-table"
+
 BOOTIMG_VOLUME_ID   ?= "boot"
 BOOTIMG_EXTRA_SPACE ?= "512"
 
@@ -59,10 +64,10 @@ def pcbios(d):
     return pcbios
 
 PCBIOS = "${@pcbios(d)}"
+PCBIOS_CLASS = "${@['','syslinux'][d.getVar('PCBIOS', True) == '1']}"
 
-# The syslinux is required for the isohybrid command and boot catalog
-inherit syslinux
 inherit ${EFI_CLASS}
+inherit ${PCBIOS_CLASS}
 
 populate() {
 	DEST=$1
diff --git a/meta/classes/image-live.bbclass b/meta/classes/image-live.bbclass
index 504725d266..05e416abe0 100644
--- a/meta/classes/image-live.bbclass
+++ b/meta/classes/image-live.bbclass
@@ -3,7 +3,6 @@ INITRD_IMAGE_LIVE ?= "core-image-minimal-initramfs"
 INITRD_LIVE ?= "${DEPLOY_DIR_IMAGE}/${INITRD_IMAGE_LIVE}-${MACHINE}.cpio.gz"
 ROOT_LIVE ?= "root=/dev/ram0"
 LABELS_LIVE ?= "boot install"
-SYSLINUX_CFG_LIVE ?= "${S}/syslinux_live.cfg"
 
 ROOTFS ?= "${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.ext4"
 
diff --git a/meta/classes/syslinux.bbclass b/meta/classes/syslinux.bbclass
index 6de656bc13..7d324c31de 100644
--- a/meta/classes/syslinux.bbclass
+++ b/meta/classes/syslinux.bbclass
@@ -20,7 +20,7 @@
 do_bootimg[depends] += "${MLPREFIX}syslinux:do_populate_sysroot \
                         syslinux-native:do_populate_sysroot"
 
-ISOLINUXDIR = "/isolinux"
+ISOLINUXDIR ?= "/isolinux"
 SYSLINUXDIR = "/"
 # The kernel has an internal default console, which you can override with
 # a console=...some_tty...
@@ -30,10 +30,9 @@ SYSLINUX_SERIAL_TTY ?= "console=ttyS0,115200"
 SYSLINUX_PROMPT ?= "0"
 SYSLINUX_TIMEOUT ?= "50"
 AUTO_SYSLINUXMENU ?= "1"
-ISO_BOOTIMG = "isolinux/isolinux.bin"
-ISO_BOOTCAT = "isolinux/boot.cat"
-MKISOFS_OPTIONS = "-no-emul-boot -boot-load-size 4 -boot-info-table"
 SYSLINUX_ROOT ?= "${ROOT}"
+SYSLINUX_CFG_VM  ?= "${S}/syslinux_vm.cfg"
+SYSLINUX_CFG_LIVE ?= "${S}/syslinux_live.cfg"
 APPEND_prepend = " ${SYSLINUX_ROOT} "
 
 # Need UUID utility code.