diff --git a/tools/sbl_uni.py b/tools/sbl_uni.py
index 9497368..3b0a1c4 100644
--- a/tools/sbl_uni.py
+++ b/tools/sbl_uni.py
@@ -39,6 +39,7 @@ RAMS = [
     (0x0E600000, 0x01A00000),   # DDRHI-ext5 (creep runway; zeros)
     (0x10000000, 0x01000000),   # DDRHI-ext6 (creep runway; zeros)
     (0x11000000, 0x02000000),   # DDRHI-ext7 (creep runway; zeros)
+    (0x13004000, 0x04000000),   # DDRHI-ext8 (creep runway; zeros)
     (0x47702000, 0x00001000),   # probe page: 0x47702100 table-descriptor reads
     (0x80000000, 0x07C00000),   # DDRHIGH_A
     (0x87C00000, 0x00800000),   # SMEM(+SBL BSS)