diff --git a/conf/machine/raspberrypi0.conf b/conf/machine/raspberrypi0.conf
index 7c2b811..3bd9e95 100644
--- a/conf/machine/raspberrypi0.conf
+++ b/conf/machine/raspberrypi0.conf
@@ -5,5 +5,5 @@
 MACHINEOVERRIDES = "raspberrypi:${MACHINE}"
 include conf/machine/raspberrypi.conf
 
-SERIAL_CONSOLE = "115200 ttyAMA0"
+SERIAL_CONSOLE ?= "115200 ttyAMA0"
 VC4_CMA_SIZE ?= "cma-128"
diff --git a/recipes-kernel/linux/linux-raspberrypi.inc b/recipes-kernel/linux/linux-raspberrypi.inc
index cf61cce..9265d55 100644
--- a/recipes-kernel/linux/linux-raspberrypi.inc
+++ b/recipes-kernel/linux/linux-raspberrypi.inc
@@ -21,7 +21,7 @@ KERNEL_DEFCONFIG_raspberrypi2 ?= "bcm2709_defconfig"
 KERNEL_DEFCONFIG_raspberrypi3-64 ?= "bcmrpi3_defconfig"
 
 # CMDLINE for raspberrypi
-CMDLINE = "dwc_otg.lpm_enable=0 console=serial0,115200 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait"
+CMDLINE ?= "dwc_otg.lpm_enable=0 console=serial0,115200 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait"
 
 # Add the kernel debugger over console kernel command line option if enabled
 CMDLINE_append = ' ${@base_conditional("ENABLE_KGDB", "1", "kgdboc=serial0,115200", "", d)}'