soc/intel/quark: Return NULL for top_of_memory
Return NULL for top_of_memory when the register has not been set.
TEST=Build and run on Galileo Gen2
Change-Id: If79cac68c2a64aa9bf3be72d3cfc4c73fceef12b
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18802
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: Martin Roth <martinroth@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/soc/intel/quark/memmap.c b/src/soc/intel/quark/memmap.c
index 53a1b24..d67856c 100644
--- a/src/soc/intel/quark/memmap.c
+++ b/src/soc/intel/quark/memmap.c
@@ -26,7 +26,8 @@
top_of_memory <<= 16;
/* Reserve 64 KiB for RMU firmware */
- top_of_memory -= 0x10000;
+ if (top_of_memory)
+ top_of_memory -= 0x10000;
/* Return the top of memory */
return (void *)top_of_memory;