diff --git a/src/soc/intel/apollolake/Kconfig b/src/soc/intel/apollolake/Kconfig
index 022c2e4b30..a11c5a28d6 100644
--- a/src/soc/intel/apollolake/Kconfig
+++ b/src/soc/intel/apollolake/Kconfig
@@ -98,10 +98,4 @@ config ROMSTAGE_ADDR
 	help
 	  The base address (in CAR) where romstage should be linked
 
-config FSPM_STACK_SIZE
-	hex
-	default 0x40000
-	help
-	  The amount of CAR memory FSPM needs. Recommended at least 256KiB
-
 endif
diff --git a/src/soc/intel/apollolake/romstage.c b/src/soc/intel/apollolake/romstage.c
index 2c8bbe80c9..7c8924dab4 100644
--- a/src/soc/intel/apollolake/romstage.c
+++ b/src/soc/intel/apollolake/romstage.c
@@ -141,10 +141,14 @@ void platform_fsp_memory_init_params_cb(struct FSPM_UPD *mupd)
 	mupd->FspmConfig.FitTablePtr = read32((void*) FIT_POINTER);
 	/* Reserve enough memory under TOLUD to save CBMEM header */
 	mupd->FspmArchUpd.BootLoaderTolumSize = cbmem_overhead_size();
-	/* Let FSPM use memory right at the top of CAR */
-	/* TODO: Add checks to see if we collide with other areas */
-	mupd->FspmArchUpd.StackBase = _car_region_end - CONFIG_FSPM_STACK_SIZE;
-	mupd->FspmArchUpd.StackSize = CONFIG_FSPM_STACK_SIZE;
+	/*
+	 * FSPM_UPD passed here is populated with default values provided by
+	 * the blob itself. We let FSPM use top of CAR region of the size it
+	 * requests.
+	 * TODO: add checks to avoid overlap/conflict of CAR usage.
+	 */
+	mupd->FspmArchUpd.StackBase = _car_region_end -
+					mupd->FspmArchUpd.StackSize;
 }
 
 __attribute__ ((weak))