diff --git a/arch/sandbox/cpu/spl.c b/arch/sandbox/cpu/spl.c
index 7590f1b..16b7662 100644
--- a/arch/sandbox/cpu/spl.c
+++ b/arch/sandbox/cpu/spl.c
@@ -129,6 +129,10 @@
 	if (!CONFIG_IS_ENABLED(UNIT_TEST))
 		return;
 
+	/* These are necessary so TFTP can use LMBs to check its load address */
+	gd->bd->bi_dram[0].start = gd->ram_base;
+	gd->bd->bi_dram[0].size = get_effective_memsize();
+
 	if (state->run_unittests) {
 		struct unit_test *tests = UNIT_TEST_ALL_START();
 		const int count = UNIT_TEST_ALL_COUNT();
diff --git a/arch/sandbox/include/asm/spl.h b/arch/sandbox/include/asm/spl.h
index 2f8b5fc..ab94755 100644
--- a/arch/sandbox/include/asm/spl.h
+++ b/arch/sandbox/include/asm/spl.h
@@ -12,6 +12,7 @@
 	BOOT_DEVICE_MMC2_2,
 	BOOT_DEVICE_BOARD,
 	BOOT_DEVICE_VBE,
+	BOOT_DEVICE_CPGMAC,
 };
 
 /**