diff --git a/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager/device-driver-probe b/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager/device-driver-probe
new file mode 100644
index 0000000..6eb9643
--- /dev/null
+++ b/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager/device-driver-probe
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+read_mux_dev() {
+  for _ in {1..3}; do
+    if /usr/sbin/i2cget -f -y "$1" "$2" 2>/dev/null; then
+      return 0
+    fi
+  done
+  return 1
+}
+
+probe_sitv_pttv_mux() {
+  if read_mux_dev 9 0x71; then
+    echo pca9546 0x71 > /sys/bus/i2c/devices/i2c-9/new_device
+  else
+    echo pca9546 0x71 > /sys/bus/i2c/devices/i2c-11/new_device
+  fi
+}
+
+probe_sitv_pttv_mux
+
+exit 0
diff --git a/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager/xyz.openbmc_project.EntityManager.conf b/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager/xyz.openbmc_project.EntityManager.conf
new file mode 100644
index 0000000..e3f79ce
--- /dev/null
+++ b/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager/xyz.openbmc_project.EntityManager.conf
@@ -0,0 +1,3 @@
+[Service]
+ExecStartPre=/usr/libexec/entity-manager/device-driver-probe
+
diff --git a/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager_%.bbappend b/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager_%.bbappend
index 6e89557..23e7ed4 100644
--- a/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager_%.bbappend
+++ b/meta-facebook/meta-harma/recipes-phosphor/configuration/entity-manager_%.bbappend
@@ -1,9 +1,19 @@
 FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
 
-SRC_URI:append = " \
+inherit obmc-phosphor-systemd systemd
+
+SRC_URI += "\
     file://blacklist.json \
+    file://device-driver-probe \
     "
 
+RDEPENDS:${PN}:append = " bash"
+
+SYSTEMD_OVERRIDE:${PN} += "xyz.openbmc_project.EntityManager.conf:xyz.openbmc_project.EntityManager.service.d/xyz.openbmc_project.EntityManager.conf"
+
 do_install:append() {
     install -m 0644 -D ${WORKDIR}/blacklist.json ${D}${datadir}/${PN}/blacklist.json
+
+    install -d ${D}${libexecdir}/${PN}
+    install -m 0755 ${WORKDIR}/device-driver-probe ${D}${libexecdir}/${PN}/
 }