diff --git a/arch/sandbox/cpu/state.c b/arch/sandbox/cpu/state.c
index 787e021..fcc4a33 100644
--- a/arch/sandbox/cpu/state.c
+++ b/arch/sandbox/cpu/state.c
@@ -418,6 +418,32 @@
 	return len;
 }
 
+int state_load_other_fdt(const char **bufp, int *sizep)
+{
+	struct sandbox_state *state = state_get_current();
+	char fname[256];
+	int len, ret;
+
+	/* load the file if needed */
+	if (!state->other_fdt_buf) {
+		len = state_get_rel_filename("arch/sandbox/dts/other.dtb",
+					     fname, sizeof(fname));
+		if (len < 0)
+			return len;
+
+		ret = os_read_file(fname, &state->other_fdt_buf,
+				   &state->other_size);
+		if (ret) {
+			log_err("Cannot read file '%s'\n", fname);
+			return ret;
+		}
+	}
+	*bufp = state->other_fdt_buf;
+	*sizep = state->other_size;
+
+	return 0;
+}
+
 int state_init(void)
 {
 	state = &main_state;
diff --git a/arch/sandbox/dts/Makefile b/arch/sandbox/dts/Makefile
index 6cbc9bb..b6a8847 100644
--- a/arch/sandbox/dts/Makefile
+++ b/arch/sandbox/dts/Makefile
@@ -5,7 +5,7 @@
 else
 dtb-$(CONFIG_SANDBOX) += sandbox.dtb
 endif
-dtb-$(CONFIG_UT_DM) += test.dtb
+dtb-$(CONFIG_UT_DM) += test.dtb other.dtb
 dtb-$(CONFIG_CMD_EXTENSION) += overlay0.dtbo overlay1.dtbo
 
 include $(srctree)/scripts/Makefile.dts
diff --git a/arch/sandbox/dts/other.dts b/arch/sandbox/dts/other.dts
new file mode 100644
index 0000000..395a792
--- /dev/null
+++ b/arch/sandbox/dts/other.dts
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Other devicetree file for running sandbox tests
+ *
+ * This used for tests which want to check they can access multiple device
+ * trees. This one is loaded and checks are made that it is actually visible.
+ */
+
+/dts-v1/;
+
+/ {
+	compatible = "sandbox-other";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	node {
+		target = <&target 3 4>;
+
+		subnode {
+			compatible = "sandbox-other2";
+			str-prop = "other";
+		};
+
+		subnode2 {
+		};
+	};
+
+	target: target {
+		compatible = "sandbox-other2";
+		#gpio-cells = <2>;
+		str-prop = "other";
+		reg = <0x8000 0x100>;
+		status = "disabled";
+	};
+};
diff --git a/arch/sandbox/include/asm/state.h b/arch/sandbox/include/asm/state.h
index 12741ee..fd42daa 100644
--- a/arch/sandbox/include/asm/state.h
+++ b/arch/sandbox/include/asm/state.h
@@ -108,6 +108,9 @@
 	bool hwspinlock;		/* Hardware Spinlock status */
 	bool allow_memio;		/* Allow readl() etc. to work */
 
+	void *other_fdt_buf;		/* 'other' FDT blob used by tests */
+	int other_size;			/* size of other FDT blob */
+
 	/*
 	 * This struct is getting large.
 	 *
@@ -280,6 +283,19 @@
 int state_get_rel_filename(const char *rel_path, char *buf, int size);
 
 /**
+ * state_load_other_fdt() - load the 'other' FDT into a buffer
+ *
+ * This loads the other.dtb file into a buffer. This is typically used in tests.
+ *
+ * @bufp: Place to put allocated buffer pointer. The buffer is read using
+ * os_read_file() which calls os_malloc(), so does affect U-Boot's own malloc()
+ * space
+ * @sizep: Returns the size of the buffer
+ * @return 0 if OK, -ve on error
+ */
+int state_load_other_fdt(const char **bufp, int *sizep);
+
+/**
  * Initialize the test system state
  */
 int state_init(void);