diff --git a/src/soc/intel/alderlake/Kconfig b/src/soc/intel/alderlake/Kconfig
index 7e693cb..a77acc3 100644
--- a/src/soc/intel/alderlake/Kconfig
+++ b/src/soc/intel/alderlake/Kconfig
@@ -15,6 +15,7 @@
 	select CPU_INTEL_FIRMWARE_INTERFACE_TABLE
 	select CPU_SUPPORTS_PM_TIMER_EMULATION
 	select FSP_COMPRESS_FSP_S_LZ4
+	select FAST_SPI_SUPPORTS_EXT_BIOS_WINDOW
 	select FSP_M_XIP
 	select FSP_STATUS_GLOBAL_RESET_REQUIRED_3
 	select GENERIC_GPIO_LIB
@@ -96,6 +97,12 @@
 	string
 	default "soc/intel/alderlake/chipset.cb"
 
+config EXT_BIOS_WIN_BASE
+	default 0xf8000000
+
+config EXT_BIOS_WIN_SIZE
+	default 0x2000000
+
 config IFD_CHIPSET
 	string
 	default "adl"