diff --git a/common/recipes-phosphor/host/phosphor-host-postd.bb b/common/recipes-phosphor/host/phosphor-host-postd.bb
index 3edf1e7..92ff489 100644
--- a/common/recipes-phosphor/host/phosphor-host-postd.bb
+++ b/common/recipes-phosphor/host/phosphor-host-postd.bb
@@ -12,7 +12,13 @@
 
 RDEPENDS_${PN} += "sdbusplus phosphor-dbus-interfaces"
 
-SYSTEMD_SERVICE_${PN} += "lpcsnoop.service"
+SNOOP_DEVICE ?= "aspeed-lpc-snoop0"
+POST_CODE_BYTES ?= "1"
+
+SERVICE_FILE = "lpcsnoop.service"
+SYSTEMD_SERVICE_${PN} += "${SERVICE_FILE}"
+SYSTEMD_SUBSTITUTIONS += "SNOOP_DEVICE:${SNOOP_DEVICE}:${SERVICE_FILE}"
+SYSTEMD_SUBSTITUTIONS += "POST_CODE_BYTES:${POST_CODE_BYTES}:${SERVICE_FILE}"
 
 require ${PN}.inc
 
diff --git a/common/recipes-phosphor/host/phosphor-host-postd/lpcsnoop.service b/common/recipes-phosphor/host/phosphor-host-postd/lpcsnoop.service
index 23dfd98..117702c 100644
--- a/common/recipes-phosphor/host/phosphor-host-postd/lpcsnoop.service
+++ b/common/recipes-phosphor/host/phosphor-host-postd/lpcsnoop.service
@@ -4,7 +4,7 @@
 
 [Service]
 Restart=always
-ExecStart={sbindir}/snoopd
+ExecStart={sbindir}/snoopd -d "/dev/{SNOOP_DEVICE}" -b "{POST_CODE_BYTES}"
 
 [Install]
 WantedBy={SYSTEMD_DEFAULT_TARGET}