[U-Boot] [PATCH] armv7: Fix infinite loop for the spl boot

[Zhong Hongbo]

On 07/06/2012 07:49 PM, Andreas Bießmann wrote:
> Dear Zhong Hongbo,
> 
> On 06.07.2012 13:42, Zhong Hongbo wrote:
>> On 07/06/2012 01:35 AM, Albert ARIBAUD <albert.u.boot at aribaud.net> (by
>> way of Albert ARIBAUD wrote:
>>> Hi Zhong Hongbo,
>>>
>>> On Thu, 05 Jul 2012 19:53:46 +0800, Zhong Hongbo <bocui107 at gmail.com>
>>> wrote:
> 
> <snip>
> 
>>
>> Ok, I just found the issue have found in other arm platfor 2011 yeas,
>> the detail information as following:
>>
>> commit 8f1da53508c78789ebeea98a92a3f55c3f84dc5d
>> Author: Christian Riesch <christian.riesch at omicron.at>
>> Date:   Wed Nov 30 22:27:37 2011 +0000
>>
>>     arm, arm926ejs: Fix clear bss loop for zero length bss
>>
>>     This patch fixes the clear bss loop for bss sections that have
>>     zero length, i.e., where __bss_start == __bss_end__.
>>
>>     Signed-off-by: Christian Riesch <christian.riesch at omicron.at>
>>     Cc: Albert Aribaud <albert.u.boot at aribaud.net>
>>
>> diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S
>> index 339c5ed..bb4d00b 100644
>> --- a/arch/arm/cpu/arm926ejs/start.S
>> +++ b/arch/arm/cpu/arm926ejs/start.S
>> @@ -301,10 +301,12 @@ clear_bss:
>>  #endif
>>         mov     r2, #0x00000000         /* clear
>>     */
>>
>> -clbss_l:str    r2, [r0]                /* clear loop...
>>     */
>> +clbss_l:cmp    r0, r1                  /* clear loop... */
>> +       bhs     clbss_e                 /* if reached end of bss, exit */
>> +       str     r2, [r0]
>>         add     r0, r0, #4
>> -       cmp     r0, r1
>> -       bne     clbss_l
>> +       b       clbss_l
>> +clbss_e:
>>>> clbss_l:str     r2, [r0]  /* clear loop...*/
>>>>         add     r0, r0, #4
>>>>         cmp     r0, r1
>>>>         bne     clbss_l
>>>
>>> Into something like
>>>
>>>> clbss_l:cmp     r0, r1
>>>>         blo     clbss_d
>>>>         str     r2, [r0]  /* clear loop...*/
>>>>         add     r0, r0, #4
>>>>         b       clbss_l
>>>> clbss_d:
>>>
>>> Also, as Andreas points out, make sure the same fix is applied to all ARM start.S files which need it.
>>
>> Ok，
> 
> I think this is the thread we will proceed.
> So as I understand we had missed in 2011 to update the other start.S
> with a fix found by Christian Riesch for arm926ejs. So please do update
> _all_ start.S (of arm;) now. I think they do have all the same error
> cause we copied it over from one to the other when implementing the 'new
> relocation' stuff.
Agree, I will do it now.

Thanks,
hongbo
> 
> Best regards
> 
> Andreas Bießmann
> 
>