diff --git a/arch/arm/src/stm32f7/Kconfig b/arch/arm/src/stm32f7/Kconfig
index 806022b6ae..806a82053e 100644
--- a/arch/arm/src/stm32f7/Kconfig
+++ b/arch/arm/src/stm32f7/Kconfig
@@ -2136,6 +2136,14 @@ endchoice #"ULPI Selection"
 
 endmenu # OTG_HS Config
 
+config STM32F7_EXTERNAL_RAM
+	bool "External RAM on FMC"
+	default n
+	depends on STM32F7_FMC
+	select ARCH_HAVE_HEAP2
+	---help---
+		In addition to internal SDRAM, external RAM may be available through the FMC.
+
 menu "QuadSPI Configuration"
 	depends on STM32F7_QUADSPI