diff --git a/config.txt b/config.txt
index 87146f0..8be466b 100644
--- a/config.txt
+++ b/config.txt
@@ -55,3 +55,6 @@ upstream_kernel=1
 # https://fedoraproject.org/w/index.php?title=Architectures/ARM/Raspberry_Pi/HATs
 
 dtoverlay=disable-bt
+
+# Enable the i2c RTC on the CM4 I/O board
+dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
diff --git a/mkinitramfs.sh b/mkinitramfs.sh
index d5b79b9..9ea8189 100644
--- a/mkinitramfs.sh
+++ b/mkinitramfs.sh
@@ -24,7 +24,7 @@ chroot "${destdir}" dracut \
     --no-hostonly \
     --modules 'nbd udev-rules dracut-systemd shutdown' \
     --drivers 'genet nbd squashfs' \
-    --force-drivers 'bcm2835_wdt' \
+    --force-drivers 'bcm2835_wdt i2c_bcm2835 rtc_pcf85063' \
     --force \
     /boot/initramfs.img \
     "${kver}"