mpc83xx: Set guarded bit on BAT that covers the end of the address space
The mpc8313erdb 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@freescale.com>
continuation to the remaining mpc83xx boards that suffer from the same problem.
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/configs/MVBLM7.h b/include/configs/MVBLM7.h
index 4ecf806..b321825 100644
--- a/include/configs/MVBLM7.h
+++ b/include/configs/MVBLM7.h
@@ -360,7 +360,8 @@
#define CONFIG_SYS_IBAT5U (CONFIG_SYS_IMMR | BATU_BL_256M | BATU_VS | BATU_VP)
/* stack in DCACHE 0xFDF00000 & FLASH @ 0xFF800000 */
-#define CONFIG_SYS_IBAT6L (0xF0000000 | BATL_PP_10 | BATL_MEMCOHERENCE)
+#define CONFIG_SYS_IBAT6L (0xF0000000 | BATL_PP_10 | BATL_MEMCOHERENCE | \
+ BATL_GUARDEDSTORAGE)
#define CONFIG_SYS_IBAT6U (0xF0000000 | BATU_BL_256M | BATU_VS | BATU_VP)
#define CONFIG_SYS_IBAT7L 0
#define CONFIG_SYS_IBAT7U 0