what exception model should I use ?

[Joel Sherrill]

Thomas Doerfler wrote:
> Hi,
>
> the information in the README is no longer correct (at least for
> CVS-HEAD). I will fix this ASAP.
>
> Nevertheless, the 603e is covered in the mpc6xx stuff (e.g. in the
> mpc52xx and the mpc83xx), so you should be able to use the new exception
> handling anyway.
>
> If you would use the old exception handling stuff, your port would not
> be compatible with any upcoming version of RTEMS.
>
>   
========================================================
Here Ye! Here Ye!!

It has been proclaimed that there is no longer an old versus new
exception model in RTEMS. In RTEMS CVS, each port has a single
exception model.

As part of this proclamation, the phrases "old exceptions"
and "new exceptions" shall henceforth be banished from the
vocabulary of residents of the Kingdom of RTEMS. All uses of
said phrases shall be cast into the CVS history dungeon and
replaced by phrases such as "simple vectored" or "PIC vectored".
========================================================

The PowerPC suffered from old/new because we were too conservative
to kill "old exception" BSPs and gave people literally 8 YEARS to convert
before killing the "old exception" code.

This has been a long standing area of confusion and we can move forward
to remove this horrible terminology which ONLY impacts the PowerPC.

I will try to write a Wiki entry on this so we can start pointing to that.

I would hate to have to reinstate the stocks or public flogging. :-D

--joel
> wkr,
> Thomas.
>
>
> 阎淼 schrieb:
>   
>> Hi,
>>
>>    I am using rtems4.8,  and the README file is allocated at
>> c/src/lib/libcpu/powerpc, some of the contents:
>>
>>   -------------------------------------------------------------------------------------------
>>    At this time, support is included for the following PowerPC
>> family members using the new exception processing model:
>>
>>   + mpc505
>>   + mpc5xx (5xx devices other than 505/509)
>>   + mpc6xx
>>   + mpc750
>>   + mpc821
>>   + mpc823 (uses mpc821 directory)
>>   + mpc850 (uses mpc860 directory)
>>   + mpc860
>>   + mpc8260
>>
>> The following PowerPC family members are supported but
>> still use the old exception processing model:
>>
>>   + ppc403
>>   + ppc405 (uses ppc403 directory)
>>   + ppc6xx (no libcpu support)
>> ------------------------------------------------------------------------------------------------
>>  so I thought ppc603e is supported by old exception processing model.
>>
>> and If I use new exception processing, I should just use code under
>> c/src/lib/libcpu/powerpc/new-exception, right?
>>
>> do I need to define any special macros ?
>>
>> 2008/4/6, Thomas Doerfler (nt) <Thomas.Doerfler at imd-systems.de>:
>> Hi,
>>
>> this is simple, use the new one, because the "old" is no longer supported.
>>
>> which README did you consult? which RTEMS version are you using?
>>
>> wkr,
>> Thomas.
>>
>> ü schrieb:
>>
>> | Hi,
>> |    I have a ppc603e based borad, which exception model should I use,
>> | new or old?( I think it should be old exception model accroding to the
>> | README file).
>> |    and what macro should I define to chose between the two? and where
>> | can I find the clock driver support, is it similar to ppc403?
>> | _______________________________________________
>> | rtems-users mailing list
>> | rtems-users at rtems.com
>> | http://rtems.rtems.org/mailman/listinfo/rtems-users
>>
>>
>>     
>> _______________________________________________
>> rtems-users mailing list
>> rtems-users at rtems.com
>> http://rtems.rtems.org/mailman/listinfo/rtems-users
>>     
>
> --
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>   


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill at OARcorp.com        On-Line Applications Research
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