[PATCH] bsp/leon3_qemu: New BSP variant

[Sebastian Huber]

On 2014-02-06 22:43, Chris Johns wrote:
> On 7/02/2014 2:00 am, Sebastian Huber wrote:
>> On 2014-02-06 15:52, Jiri Gaisler wrote:
>>>
>>> On 02/06/2014 03:37 PM, Sebastian Huber wrote:
>>>> >On 2014-02-06 15:35, Gedare Bloom wrote:
>>>>> >>Thanks Sebastian. Is there some sim-script support or
>>>>> documentation on
>>>>> >>using this BSP with Qemu?
>>>> >
>>>> >Yes, I will commit this tomorrow.  Can't switch branches currently
>>>> due to active test runs.
>>>> >
>>> It seems that this patch is necessary because qemu/leon3 does
>>> not implement the plug&play feature of leon3, and does not
>>> pre-initialize timers and UARTs. Wouldn't it be simpler to
>>> add the missing features to qemu, rather than add an extra bsp?
>>
>> Yes, this solution would be better.
>
> I agree.
>
>> The problem is that this requires
>> more work and I don't have a budget for this.
>
> That may be the case but it is not really a concern for the project.

It is a concern for the project since if I work on QEMU then I cannot work on 
RTEMS.

>
>> We can of course remove this BSP if QEMU is capable enough some time in
>> the future.
>
> This is correct however rejecting the patch means fixing qemu is the best
> solution and that is in the interest of the project. Adding a bsp is much
> easier than removing one even when clearly stated it is temporary. Hiding
> issues in work arounds like this is not a good idea.

I considered to add the support to QEMU, but my estimate was that this takes 
several days.  Adding this BSP was a matter of one hour or so.  It is good 
enough to run the RTEMS and GCC test suites.  My main goal was to be able to 
test the CAS instruction.  This is not available on SIS.  Since QEMU has some 
benefits over SIS I decided to add the support for it to QEMU instead of SIS:

http://lists.gnu.org/archive/html/qemu-devel/2013-11/msg03718.html

This patch is still not included in QEMU.  Imagine how much time and patience 
you need to integrate larger changes sets.

If you don't like the BSP, then we can remove it.

>
> I prefer seeing qemu get fixed.

I prefer this too, but how will do it?  Its not me.

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
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E-Mail  : sebastian.huber at embedded-brains.de
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