powerpc/fsl_booke: protect the access to MAS7

The e500v1 doesn't implement the MAS7, so we should avoid to access
this register on that implementations. In the current kernel, the
access to MAS7 are protected by either CONFIG_PHYS_64BIT or
MMU_FTR_BIG_PHYS. Since some code are executed before the code
patching, we have to use CONFIG_PHYS_64BIT in these cases.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index f45726a1d963..09921a5197c6 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -82,7 +82,9 @@ _ENTRY(_start);
         and     r19,r3,r18              /* r19 = page offset */
         andc    r31,r20,r18             /* r31 = page base */
         or      r31,r31,r19             /* r31 = devtree phys addr */
+#ifdef CONFIG_PHYS_64BIT
         mfspr   r30,SPRN_MAS7
+#endif
 
         li      r25,0                   /* phys kernel start (low) */
         li      r24,0                   /* CPU number */