From 01b9eeff033e0fd765a3f160b3282b2d0fe5bda8 Mon Sep 17 00:00:00 2001
From: Elliot Nunn <elliotnunn@me.com>
Date: Sat, 25 May 2019 15:08:05 +0800
Subject: [PATCH] Tiny round-trip fix for NewWorld ROMs

---
 tbxi/powerpc_build.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tbxi/powerpc_build.py b/tbxi/powerpc_build.py
index 8fe4c52..0b94a18 100644
--- a/tbxi/powerpc_build.py
+++ b/tbxi/powerpc_build.py
@@ -232,10 +232,11 @@ def build(src):
         insert_and_assert(flat, lowmem, ptr)
         fields['MacLowMemInitOffset'] = ptr
 
-        ptr -= len(pagemap)
-        insert_and_assert(flat, pagemap, ptr)
-        fields['PageMapInitOffset'] = ptr
-        fields['PageMapInitSize'] = len(pagemap)
+        if len(pagemap) > 0:
+            ptr -= len(pagemap)
+            insert_and_assert(flat, pagemap, ptr)
+            fields['PageMapInitOffset'] = ptr
+            fields['PageMapInitSize'] = len(pagemap)
 
         insert_and_assert(flat, ConfigInfo.pack(**fields), 0)