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-rw-r--r--common/board_f.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/common/board_f.c b/common/board_f.c
index 4d8b8a6..62fdaeb 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -360,6 +360,18 @@ static int setup_fdt(void)
/* Get the top of usable RAM */
__weak ulong board_get_usable_ram_top(ulong total_size)
{
+#ifdef CONFIG_SYS_SDRAM_BASE
+ /*
+ * Detect whether we have so much RAM it goes past the end of our
+ * 32-bit address space. If so, clip the usable RAM so it doesn't.
+ */
+ if (gd->ram_top < CONFIG_SYS_SDRAM_BASE)
+ /*
+ * Will wrap back to top of 32-bit space when reservations
+ * are made.
+ */
+ return 0;
+#endif
return gd->ram_top;
}