Change the TEXT_BASE from 0xFFF00000 to 0xFF000000.
Both work. 0xFF000000 seems more reasonable.
diff --git a/board/mpc7448hpc2/config.mk b/board/mpc7448hpc2/config.mk
index 9147a5c..2e58858 100644
--- a/board/mpc7448hpc2/config.mk
+++ b/board/mpc7448hpc2/config.mk
@@ -21,7 +21,7 @@
 #
 
 # Flash address
-TEXT_BASE = 0xFFF00000
+TEXT_BASE = 0xFF000000
 # RAM address
 #TEXT_BASE = 0x00400000