Debugging of e500 and e500v1 processer requires MSR[DE] bit to be set always.
Where MSR = Machine State register
Make sure of MSR[DE] bit is set uniformaly across the different execution
address space i.e. AS0 and AS1.
Signed-off-by: Radu Lazarescu <radu.lazare...@freescale.com>
Signed-off-by: Catalin Udma <catalin.u...@freescale.com>
Signed-off-by: Marius Grigoras <marius.grigo...@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabha...@freescale.com>
---
Based upon git://git.denx.de/u-boot.git branch master
Changes for v2:
- Avoid MSR_DE negation in arch_preboot
- Made MSR_DE set code independent of any #define
No change, Resending again
Tested on
- SoC having E500 Family processor (P1010RDB, BSC9131RDB)
- SoC having E500MC Family processor (P4080DS, P3041DS)
arch/powerpc/cpu/mpc85xx/cpu_init.c | 2 +-
arch/powerpc/cpu/mpc85xx/start.S | 7 +++++--
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c
b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 2e4a06c..3bcbffa 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -532,7 +532,7 @@ void arch_preboot_os(void)
* disabled by the time we get called.
*/
msr = mfmsr();
- msr &= ~(MSR_ME|MSR_CE|MSR_DE);
+ msr &= ~(MSR_ME|MSR_CE);
mtmsr(msr);
setup_ivors();
diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S
index 7bfa2d5..597151b 100644
--- a/arch/powerpc/cpu/mpc85xx/start.S
+++ b/arch/powerpc/cpu/mpc85xx/start.S
@@ -82,6 +82,9 @@
.globl _start_e500
_start_e500:
+/* Enable debug exception */
+ li r1,MSR_DE
+ mtmsr r1
#if defined(CONFIG_SECURE_BOOT) && defined(CONFIG_E500MC)
/* ISBC uses L2 as stack.
@@ -729,8 +732,8 @@ create_init_ram_area:
msync
tlbwe
- lis r6,MSR_IS|MSR_DS@h
- ori r6,r6,MSR_IS|MSR_DS@l
+ lis r6,MSR_IS|MSR_DS|MSR_DE@h
+ ori r6,r6,MSR_IS|MSR_DS|MSR_DE@l
lis r7,switch_as@h
ori r7,r7,switch_as@l
--
1.7.5.4
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