linux-kernel - Re: [PATCH 1/1] ARM: pxa168: fix corrected reset vector

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Date:	Tue, 31 Aug 2010 14:08:54 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	"Mark F. Brown" <mark.brown314@...il.com>
Cc:	Haojian Zhuang <haojian.zhuang@...vell.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ARM: pxa168: fix corrected reset vector

On Tue, Aug 31, 2010 at 2:04 PM, Eric Miao <eric.y.miao@...il.com> wrote:
> On Tue, Aug 31, 2010 at 2:02 PM, Mark F. Brown <mark.brown314@...il.com> wrote:
>> On Tue, Aug 31, 2010 at 1:48 AM, Eric Miao <eric.y.miao@...il.com> wrote:
>>> On Thu, Aug 26, 2010 at 5:07 PM, Mark F. Brown <mark.brown314@...il.com> wrote:
>>>> Signed-off-by: Mark F. Brown <mark.brown314@...il.com>
>>>> ---
>>>>  arch/arm/mach-mmp/include/mach/system.h |    2 +-
>>>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>>>
>>>> diff --git a/arch/arm/mach-mmp/include/mach/system.h b/arch/arm/mach-mmp/include/mach/system.h
>>>> index 4f5b0e0..926e9c0 100644
>>>> --- a/arch/arm/mach-mmp/include/mach/system.h
>>>> +++ b/arch/arm/mach-mmp/include/mach/system.h
>>>> @@ -16,6 +16,6 @@ static inline void arch_idle(void)
>>>>
>>>>  static inline void arch_reset(char mode, const char *cmd)
>>>>  {
>>>> -       cpu_reset(0);
>>>> +       cpu_reset(0xffff0000);
>>>
>>> Not sure if this correct. But normally reset jump happens after we turn
>>> off the MMU and so on. Ain't the BootROM starts from 0 ?
>>>
>>>>  }
>>>>  #endif /* __ASM_MACH_SYSTEM_H */
>>>> --
>>>> 1.7.0.4
>>>>
>>>>
>>>
>>
>> Eric, the boot-rom for pxa168 starts at 0xffff_0000. I am pretty sure
>> about that! If you set the reset vector to 0x0 it will crash during
>> reboot. I will send you xdb snapshots if you need me to.
>>
>
> OK, you are expert on this :-)
>
> Applied to 'fix'.
>

One moment. Since this is really global to pxa910 and mmp2, so I
suggest this being fixed for pxa168 only first. How about this:

    ARM: pxa168: fix corrected reset vector

    Reset vector for pxa168 is 0xffff_0000 not 0x0. This fix allows
    reboot to work

    Signed-off-by: Mark F. Brown <mark.brown314@...il.com>

diff --git a/arch/arm/mach-mmp/include/mach/system.h
b/arch/arm/mach-mmp/include/mach/system.h
index 4f5b0e0..1a8a25e 100644
--- a/arch/arm/mach-mmp/include/mach/system.h
+++ b/arch/arm/mach-mmp/include/mach/system.h
@@ -9,6 +9,8 @@
 #ifndef __ASM_MACH_SYSTEM_H
 #define __ASM_MACH_SYSTEM_H

+#include <mach/cputype.h>
+
 static inline void arch_idle(void)
 {
 	cpu_do_idle();
@@ -16,6 +18,9 @@ static inline void arch_idle(void)

 static inline void arch_reset(char mode, const char *cmd)
 {
-	cpu_reset(0);
+	if (cpu_is_pxa168())
+		cpu_reset(0xffff0000);
+	else
+		cpu_reset(0);
 }
 #endif /* __ASM_MACH_SYSTEM_H */
--
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