RTEMS 4.7.99.2 Available -- PowerPC/virtex feedback

[Thomas Doerfler (nt)]

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Robert, Joel,
Joel Sherrill schrieb:
> Robert S. Grimes wrote:
> 
>>In my "working" configuration (i.e. no isysnc or spurious exceptions), I
>>can't get my app to start up with 4.7.99.2.
>>
>>1. Not germane to this discussion, but Thomas owes us a patch in the
>>xiltemac.c driver - candidate patch attached again.
>>
>>  
> 
> Thomas should review that and commit it as he feels.

The patch looks fine for me, I have commited it.
> 
>>2. I get an Exception 7 in or just after the call to
>>_API_extensions_Run_postdriver() on (or about) line 269 of exinit.c. 
>>Stepping in, it is in the first (of ?) extension postdriver_hook(), which:
>>     2.1 In tasks.c, line 301, calls
>>(*_RTEMS_tasks_Initialize_user_tasks_p)();
>>     2.2 Now in taskinitusers.c, function
>>_RTEMS_tasks_Initialize_user_tasks_body( void ), it dies in the first
>>call to rtems_task_create on line 71, giving the exception 7.  The task
>>it was trying to create is my main init task.
>>
>>  
> 
> 
> Exception 7 is a NOFP exception which would indicate the
> code is compiled to use the FPU and you don't have one.
> Why an FPU instruction would be in use at this point in
> RTEMS is beyond me.

Maybe the task is created as "Non-FloatingPoint", but the compiler uses
FPU registers to e.g. move variables? This might also cause the Non-FP
Exception, I guess.

Try to disassmble the relevant code or check/change, whether the task is
created with FPU enabled.

wkr,
Thomas

> 
> Is the linker script and memory map right for your board?
> This all seems flakey like something is overwriting something.
> 
>>Sorry, I have to quit right now on this.  The user_tasks structure at
>>this point looks fine.  Things are getting too detailed for my
>>understanding at this point.
>>
>>Sorry I couldn't be more help...
>>
>>  
> 
> It is hard to debug these things.
> 
>>-Bob
>>  
> 
> 
> _______________________________________________
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> rtems-users at rtems.com
> http://rtems.rtems.org/mailman/listinfo/rtems-users


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IMD Ingenieurbuero fuer Microcomputertechnik
Thomas Doerfler           Herbststrasse 8
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