powerpc: p1_p2_rdb_pc: add TPL for p1_p2_rdb_pc nand boot

Enable TPL for p1_p2_rdb_pc nand boot.

Signed-off-by: Ying Zhang <b40530@freescale.com>
diff --git a/board/freescale/p1_p2_rdb_pc/tlb.c b/board/freescale/p1_p2_rdb_pc/tlb.c
index d6afa7b..1c0008b 100644
--- a/board/freescale/p1_p2_rdb_pc/tlb.c
+++ b/board/freescale/p1_p2_rdb_pc/tlb.c
@@ -98,7 +98,13 @@
 	/* *I*G - L2SRAM */
 	SET_TLB_ENTRY(1, CONFIG_SYS_INIT_L2_ADDR, CONFIG_SYS_INIT_L2_ADDR_PHYS,
 		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_G,
-		      0, 11, BOOKE_PAGESZ_256K, 1)
+		      0, 11, BOOKE_PAGESZ_256K, 1),
+#if CONFIG_SYS_L2_SIZE >= (256 << 10)
+	SET_TLB_ENTRY(1, CONFIG_SYS_INIT_L2_ADDR + 0x40000,
+		      CONFIG_SYS_INIT_L2_ADDR_PHYS + 0x40000,
+		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
+		      0, 12, BOOKE_PAGESZ_256K, 1)
+#endif
 #endif
 };