sandbox: Add 64-bit sandbox

To debug device tree issues involving 32- and 64-bit platforms, it is useful to
have a generic 64-bit platform available.

Add a version of the sandbox that uses 64-bit integers for its physical
addresses as well as a modified device tree.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Added CONFIG_SYS_TEXT_BASE to configs/sandbox64_defconfig
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig
index 87418e3..2a08533 100644
--- a/arch/sandbox/Kconfig
+++ b/arch/sandbox/Kconfig
@@ -10,6 +10,11 @@
 config SYS_CPU
 	default "sandbox"
 
+config SANDBOX64
+	bool "Use 64-bit addresses"
+	select PHYS_64BIT
+	select HOST_64BIT
+
 config SANDBOX_SPL
 	bool "Enable SPL for sandbox"
 	select SUPPORT_SPL
@@ -20,24 +25,25 @@
 
 choice
 	prompt "Run sandbox on 32/64-bit host"
-	default SANDBOX_64BIT
+	default HOST_64BIT
 	help
 	  Sandbox can be built on 32-bit and 64-bit hosts.
 	  The default is to build on a 64-bit host and run
 	  on a 64-bit host. If you want to run sandbox on
 	  a 32-bit host, change it here.
 
-config SANDBOX_32BIT
+config HOST_32BIT
 	bool "32-bit host"
+	depends on !PHYS_64BIT
 
-config SANDBOX_64BIT
+config HOST_64BIT
 	bool "64-bit host"
 
 endchoice
 
 config SANDBOX_BITS_PER_LONG
 	int
-	default 32 if SANDBOX_32BIT
-	default 64 if SANDBOX_64BIT
+	default 32 if HOST_32BIT
+	default 64 if HOST_64BIT
 
 endmenu