diff --git a/meta-facebook/meta-harma/recipes-phosphor/chassis/obmc-phosphor-buttons/gpio_defs.json b/meta-facebook/meta-harma/recipes-phosphor/chassis/obmc-phosphor-buttons/gpio_defs.json
new file mode 100644
index 0000000..d66c175
--- /dev/null
+++ b/meta-facebook/meta-harma/recipes-phosphor/chassis/obmc-phosphor-buttons/gpio_defs.json
@@ -0,0 +1,10 @@
+{
+        "gpio_definitions": [
+            {
+                "name": "HOST_SELECTOR",
+                "group_gpio_config" : [],
+                "max_position" : 1,
+                "host_selector_map" : {}
+            }
+        ]
+}
diff --git a/meta-facebook/meta-harma/recipes-phosphor/chassis/obmc-phosphor-buttons_%.bbappend b/meta-facebook/meta-harma/recipes-phosphor/chassis/obmc-phosphor-buttons_%.bbappend
new file mode 100644
index 0000000..91e994e
--- /dev/null
+++ b/meta-facebook/meta-harma/recipes-phosphor/chassis/obmc-phosphor-buttons_%.bbappend
@@ -0,0 +1,10 @@
+FILESEXTRAPATHS:append := "${THISDIR}/${PN}:"
+
+SRC_URI += "file://gpio_defs.json"
+
+do_install:append() {
+        install -d ${D}${sysconfdir}/default/obmc/gpio/
+        install -m 0644 ${WORKDIR}/gpio_defs.json ${D}/${sysconfdir}/default/obmc/gpio/
+}
+
+FILES:${PN}-signals:append = " ${sysconfdir}/default/obmc/gpio/gpio_defs.json"
diff --git a/meta-facebook/meta-harma/recipes-phosphor/images/fb-harma-phosphor-image.inc b/meta-facebook/meta-harma/recipes-phosphor/images/fb-harma-phosphor-image.inc
index b602a3d..851d964 100644
--- a/meta-facebook/meta-harma/recipes-phosphor/images/fb-harma-phosphor-image.inc
+++ b/meta-facebook/meta-harma/recipes-phosphor/images/fb-harma-phosphor-image.inc
@@ -14,3 +14,9 @@
 OBMC_IMAGE_EXTRA_INSTALL:append = " \
     sshpass \
 "
+
+# Enable obmc-phosphor-buttons which needed by debug card function.
+OBMC_IMAGE_EXTRA_INSTALL:append = " \
+    obmc-phosphor-buttons-signals \
+    obmc-phosphor-buttons-handler \
+"