diff --git a/tools/sbl_uni.py b/tools/sbl_uni.py
index 3fd89a4..202b30c 100644
--- a/tools/sbl_uni.py
+++ b/tools/sbl_uni.py
@@ -34,6 +34,7 @@ RAMS = [
     (0x09600000, 0x01000000),   # DDRHI-ext (tier spillover; zeros)
     (0x0A600000, 0x01000000),   # DDRHI-ext2 (creep runway; zeros)
     (0x0B600000, 0x01000000),   # DDRHI-ext3 (creep runway; zeros)
+    (0x0C600000, 0x02000000),   # DDRHI-ext4 (creep runway; zeros)
     (0x80000000, 0x07C00000),   # DDRHIGH_A
     (0x87C00000, 0x00800000),   # SMEM(+SBL BSS)
     (0x07800000, 0x000AF000),   # leak-sink HI (S12 frame march;