diff --git a/tools/sbl_uni.py b/tools/sbl_uni.py
index aa677ed..33406cb 100644
--- a/tools/sbl_uni.py
+++ b/tools/sbl_uni.py
@@ -31,6 +31,7 @@ RAMS = [
     (0x08000000, 0x00600000),   # DDRLOW
     (0x08600000, 0x00010000),   # IMEM
     (0x08610000, 0x00FF0000),   # DDRHI (QEMU parity; IMEM-stack spillover)
+    (0x09600000, 0x01000000),   # DDRHI-ext (tier spillover; zeros)
     (0x80000000, 0x07C00000),   # DDRHIGH_A
     (0x87C00000, 0x00800000),   # SMEM(+SBL BSS)
     (0x07800000, 0x000AF000),   # leak-sink HI (S12 frame march;