8641D with linux 2.6.29 did'n show second cpu

[Kumar Gala]

On Apr 1, 2009, at 8:36 AM, Eduard Fuchs wrote:

> Hi,
>
> Am Mittwoch 01 April 2009 06:10:36 schrieb Kumar Gala:
>> On Mar 31, 2009, at 10:06 AM, Eduard Fuchs wrote:
>>> Hi,
>>>
>>> Am Dienstag 31 März 2009 15:20:21 schrieb Kumar Gala:
>>>> On Mar 31, 2009, at 5:15 AM, Eduard Fuchs wrote:
>>>>> Hi,
>>>>>
>>>>> I'm testing the evaluation board from freescale (MPC8641DHPCN)  
>>>>> with
>>>>> the latest
>>>>> linux kernel (2.6.29) and the second core seems disabled.  
>>>>> CONFIG_SPM
>>>>> is
>>>>> enabled but the /proc/cpuinfo shows only one cpu. With original
>>>>> 2.6.27 kernel
>>>>> both cpu cores appears in /proc/cpuinfo.
>>>>>
>>>>> Has anyone an idea how can i enable the second core?
>>>>
>>>> Are you using u-boot?  I can't remember if you need a newer u- 
>>>> boot to
>>>> deal with changes in how we bring up the second core.
>>>
>>> Yes. My u-boot version is 2009.03. Are there some additional config
>>> keys for
>>> SMP support in u-boot?
>>
>> It appears we introduced a bug in v2009.03 of u-boot.
>
> I never thought that the problem could be in u-boot. I tested the  
> board with
> u-boot v2009.01 and it works well.

the u-boot bug is that we are over-writting the page of code we need  
to bring up the second core.  Thus when the kernel releases the 2nd  
core it goes off in the weeds.

I've sent some patches to the u-boot list that should fix the problem  
by making sure that u-boot avoids using the page of memory we need for  
the 2nd core.

- k