diff --git a/src/mainboard/google/rex/Kconfig b/src/mainboard/google/rex/Kconfig
index cf038b7..4021fce 100644
--- a/src/mainboard/google/rex/Kconfig
+++ b/src/mainboard/google/rex/Kconfig
@@ -68,8 +68,8 @@
 	default "variants/baseboard/\$(CONFIG_BASEBOARD_DIR)/devicetree.cb"
 
 config FMDFILE
-	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/chromeos_ec_ish-debug-fsp.fmd" if CHROMEOS && DRIVERS_INTEL_ISH && BUILDING_WITH_DEBUG_FSP
-	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/chromeos_ec_ish.fmd" if CHROMEOS && DRIVERS_INTEL_ISH
+	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/chromeos_ec_ish-debug-fsp.fmd" if CHROMEOS && BOARD_GOOGLE_REX_EC_ISH && BUILDING_WITH_DEBUG_FSP
+	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/chromeos_ec_ish.fmd" if CHROMEOS && BOARD_GOOGLE_REX_EC_ISH
 	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/chromeos-debug-fsp.fmd" if CHROMEOS && BUILDING_WITH_DEBUG_FSP
 	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/chromeos.fmd" if CHROMEOS
 
diff --git a/src/mainboard/google/rex/Kconfig.name b/src/mainboard/google/rex/Kconfig.name
index a4fa63a..13a0447 100644
--- a/src/mainboard/google/rex/Kconfig.name
+++ b/src/mainboard/google/rex/Kconfig.name
@@ -5,6 +5,7 @@
 	select BOARD_GOOGLE_BASEBOARD_REX
 	select DRIVERS_GENERIC_MAX98357A
 	select DRIVERS_GENESYSLOGIC_GL9755
+	select DRIVERS_INTEL_ISH
 	select DRIVERS_INTEL_SOUNDWIRE
 	select DRIVERS_SOUNDWIRE_CS42L42
 	select DRIVERS_SOUNDWIRE_MAX98363
diff --git a/src/mainboard/google/rex/variants/rex0/overridetree.cb b/src/mainboard/google/rex/variants/rex0/overridetree.cb
index ab9596e..39a0a4d 100644
--- a/src/mainboard/google/rex/variants/rex0/overridetree.cb
+++ b/src/mainboard/google/rex/variants/rex0/overridetree.cb
@@ -50,6 +50,10 @@
 		option VPU_DIS			0
 		option VPU_EN			1
 	end
+	field ISH 21
+		option ISH_DISABLE		0
+		option ISH_ENABLE		1
+	end
 end
 
 chip soc/intel/meteorlake
@@ -277,6 +281,13 @@
 				.flags = PCIE_RP_LTR | PCIE_RP_AER,
 			}"
 		end	#PCIE9 SSD card
+		device ref ish on
+			probe ISH ISH_ENABLE
+			chip drivers/intel/ish
+				register "firmware_name" = ""rex_ish.bin""
+			device generic 0 on end
+			end
+		end
 		device ref tbt_pcie_rp0 on end
 		device ref tbt_pcie_rp2 on end
 		device ref vpu on