diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 9f45c48..2f55926 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -533,7 +533,9 @@
 	};
 
 	cpus {
+		timebase-frequency = <2000000>;
 		cpu-test1 {
+			timebase-frequency = <3000000>;
 			compatible = "sandbox,cpu_sandbox";
 			u-boot,dm-pre-reloc;
 		};
@@ -839,11 +841,16 @@
 			0x58 8>;
 	};
 
-	timer {
+	timer@0 {
 		compatible = "sandbox,timer";
 		clock-frequency = <1000000>;
 	};
 
+	timer@1 {
+		compatible = "sandbox,timer";
+		sandbox,timebase-frequency-fallback;
+	};
+
 	tpm2 {
 		compatible = "sandbox,tpm2";
 	};
diff --git a/arch/sandbox/include/asm/cpu.h b/arch/sandbox/include/asm/cpu.h
new file mode 100644
index 0000000..c97ac7b
--- /dev/null
+++ b/arch/sandbox/include/asm/cpu.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
+ */
+
+#ifndef __SANDBOX_CPU_H
+#define __SANDBOX_CPU_H
+
+void cpu_sandbox_set_current(const char *name);
+
+#endif /* __SANDBOX_CPU_H */