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-rw-r--r--src/include/cbmem.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 2e947a1973..524bfb5748 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -80,7 +80,10 @@ void cbmem_initialize_empty_id_size(u32 id, u64 size);
/* Return the top address for dynamic cbmem. The address returned needs to
* be consistent across romstage and ramstage, and it is required to be
- * below 4GiB. */
+ * below 4GiB.
+ * Board or chipset should return NULL if any interface that might rely on cbmem
+ * (e.g. cbfs, vboot) is used before the cbmem backing store has been
+ * initialized. */
void *cbmem_top(void);
/* Add a cbmem entry of a given size and id. These return NULL on failure. The