diff --git a/plat/st/common/stm32mp_dt.c b/plat/st/common/stm32mp_dt.c
index 6465c10e8..0b3564692 100644
--- a/plat/st/common/stm32mp_dt.c
+++ b/plat/st/common/stm32mp_dt.c
@@ -209,15 +209,24 @@ int dt_get_stdout_uart_info(struct dt_node_info *info)
  ******************************************************************************/
 uint32_t dt_get_ddr_size(void)
 {
+	static uint32_t size;
 	int node;
 
+	if (size != 0U) {
+		return size;
+	}
+
 	node = fdt_node_offset_by_compatible(fdt, -1, DT_DDR_COMPAT);
 	if (node < 0) {
 		INFO("%s: Cannot read DDR node in DT\n", __func__);
 		return 0;
 	}
 
-	return fdt_read_uint32_default(fdt, node, "st,mem-size", 0);
+	size = fdt_read_uint32_default(fdt, node, "st,mem-size", 0U);
+
+	flush_dcache_range((uintptr_t)&size, sizeof(uint32_t));
+
+	return size;
 }
 
 /*******************************************************************************