[U-Boot] [PATCH] 8313erdb: Set guarded bit on BAT that covers the end of the address space.

[Scott Wood]

This board currently sets DBAT6 to cover all of the final 256MiB of
address space; however, not all of this space is covered by a device.  In
particular, flash sits at 0xfe000000-0xfe7fffff, and nothing is mapped
at the far end of the address space.

In zlib, there is a loop that references p[-1] if p is non-NULL.  Under
some circumstances, this leads to the CPU speculatively loading from
0xfffffff8 if p is NULL.  This leads to a machine check.

Signed-off-by: Scott Wood <scottwood at freescale.com>
---
Note that there are likely other board with the same issue.

 include/configs/MPC8313ERDB.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/configs/MPC8313ERDB.h b/include/configs/MPC8313ERDB.h
index 0ef4eba..21aedee 100644
--- a/include/configs/MPC8313ERDB.h
+++ b/include/configs/MPC8313ERDB.h
@@ -544,7 +544,7 @@
 #define CONFIG_SYS_IBAT5U	(CONFIG_SYS_IMMR | BATU_BL_256M | BATU_VS | BATU_VP)
 
 /* SDRAM @ 0xF0000000, stack in DCACHE 0xFDF00000 & FLASH @ 0xFE000000 */
-#define CONFIG_SYS_IBAT6L	(0xF0000000 | BATL_PP_10)
+#define CONFIG_SYS_IBAT6L	(0xF0000000 | BATL_PP_10 | BATL_GUARDEDSTORAGE)
 #define CONFIG_SYS_IBAT6U	(0xF0000000 | BATU_BL_256M | BATU_VS | BATU_VP)
 
 #define CONFIG_SYS_IBAT7L	(0)
-- 
1.5.3