Re: Regarding MPC8641D

[sivaji <rameshmrm@gmail.com>]

Hai,
             The kernel was compiled in SMP mode. The low memory offset mode
is only for AMP mode means, then how we test both the core 0 and 1 in the
linux kernel ?. Asper my understanding if we enable the Low Memory Offset
mode, then only the core1 translation is enabled. If we disalbed the Low
Memory offset mode, Only Core 0  will work in SMP mode and Core 1 will idle.
If we want to test the efficient of Dual core means we need to enable both
the core and Low Memory Offset Mode. For this configuration linux kernel was
not up.
( Please correct me if I am wrong )

Thanks and Regards
Sivaji


Chris Fester wrote:
> 
> On Tue, 2007-12-04 at 23:51 -0800, sivaji wrote:
>>             We have designed  a MPC8641D based AMC card. We are using the
>> kernel (2.6.23-rc4) and uboot (1.2.0).  When we disable the core1 Low
>> Memory
>> offset mode the kernel was up and when we enable this core1 Low Memory
>> offset mode kernel was not up, It was hang after MPIC initialization.
> [snip!]
>>                      After this the kernel was hang, i want to know why
>> kernel was hang when we enalbe Low memory Offset mode. Please help me to
>> fix
>> this issue.
> 
> Have you compiled your kernel for SMP mode?  I believe the Low memory
> offset mode is only for AMP mode (vxworks can use this, probably other
> OSes).  I don't know if the kernel has support for any multiprocessing
> mode other than SMP.
> 
> Hope that helps,
> Chris
> 
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