common/board_f: avoid -Wtype-limits warning

CONFIG_SYS_SDRAM_BASE maybe zero. Avoid a build warning when compiling with
-Wtype-limits.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/common/board_f.c b/common/board_f.c
index 522345351124df2516ab15bcea7a8088289f78af..a5ead31ca7dc87e9265fd22fff29529d5c7bfbde 100644 (file)
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -309,7 +309,7 @@ __weak int mach_cpu_init(void)
 /* Get the top of usable RAM */
 __weak ulong board_get_usable_ram_top(ulong total_size)
 {
-#ifdef CONFIG_SYS_SDRAM_BASE
+#if defined(CONFIG_SYS_SDRAM_BASE) && CONFIG_SYS_SDRAM_BASE > 0
        /*
         * Detect whether we have so much RAM that it goes past the end of our
         * 32-bit address space. If so, clip the usable RAM so it doesn't.