diff --git a/plat/rpi3/rpi3_bl31_setup.c b/plat/rpi3/rpi3_bl31_setup.c
index 0ae783e..483d150 100644
--- a/plat/rpi3/rpi3_bl31_setup.c
+++ b/plat/rpi3/rpi3_bl31_setup.c
@@ -6,6 +6,7 @@
 
 #include <assert.h>
 #include <bl_common.h>
+#include <libfdt.h>
 #include <platform.h>
 #include <platform_def.h>
 #include <xlat_mmu_helpers.h>
@@ -137,12 +138,74 @@
 	enable_mmu_el3(0);
 }
 
+/*
+ * Add information to the device tree (if any) about the reserved DRAM used by
+ * the Trusted Firmware.
+ */
+static void rpi3_dtb_add_mem_rsv(void)
+{
+	int i, regions, rc;
+	uint64_t addr, size;
+	void *dtb = (void *)RPI3_PRELOADED_DTB_BASE;
+
+	INFO("rpi3: Checking DTB...\n");
+
+	/* Return if no device tree is detected */
+	if (fdt_check_header(dtb) != 0)
+		return;
+
+	regions = fdt_num_mem_rsv(dtb);
+
+	VERBOSE("rpi3: Found %d mem reserve region(s)\n", regions);
+
+	/* We expect to find one reserved region that we can modify */
+	if (regions < 1)
+		return;
+
+	/*
+	 * Look for the region that corresponds to the default boot firmware. It
+	 * starts at address 0, and it is not needed when the default firmware
+	 * is replaced by this port of the Trusted Firmware.
+	 */
+	for (i = 0; i < regions; i++) {
+		if (fdt_get_mem_rsv(dtb, i, &addr, &size) != 0)
+			continue;
+
+		if (addr != 0x0)
+			continue;
+
+		VERBOSE("rpi3: Firmware mem reserve region found\n");
+
+		rc = fdt_del_mem_rsv(dtb, i);
+		if (rc != 0) {
+			INFO("rpi3: Can't remove mem reserve region (%d)\n", rc);
+		}
+
+		break;
+	}
+
+	if (i == regions) {
+		VERBOSE("rpi3: Firmware mem reserve region not found\n");
+	}
+
+	/*
+	 * Reserve all SRAM. As said in the documentation, this isn't actually
+	 * secure memory, so it is needed to tell BL33 that this is a reserved
+	 * memory region. It doesn't guarantee it won't use it, though.
+	 */
+	rc = fdt_add_mem_rsv(dtb, SEC_SRAM_BASE, SEC_SRAM_SIZE);
+	if (rc != 0) {
+		WARN("rpi3: Can't add mem reserve region (%d)\n", rc);
+	}
+
+	INFO("rpi3: Reserved 0x%llx - 0x%llx in DTB\n", SEC_SRAM_BASE,
+	     SEC_SRAM_BASE + SEC_SRAM_SIZE);
+}
+
 void bl31_platform_setup(void)
 {
-	/*
-	 * Do initial security configuration to allow DRAM/device access
-	 * (if earlier BL has not already done so).
-	 */
-
-	return;
+#ifdef RPI3_PRELOADED_DTB_BASE
+	/* Only modify a DTB if we know where to look for it */
+	rpi3_dtb_add_mem_rsv();
+#endif
 }