Re: [PATCH 1/1] beagleboard: enable hard floating point abi

[Darren Hart <dvhart@linux.intel.com>]

On 08/23/2011 08:34 AM, Tom Rini wrote:
> On Tue, Aug 23, 2011 at 8:31 AM, Darren Hart <dvhart@linux.intel.com> wrote:
>> On 08/23/2011 05:38 AM, Koen Kooi wrote:
>>>
>>> Op 20 aug. 2011, om 00:23 heeft Darren Hart het volgende geschreven:
>>>
>>>> Fixes [YOCTO #1203]
>>>>
>>>> Using the hard floating point abi is incompatible with some binary
>>>> libaries and 3D support for the Beagleboard. As we do not provide
>>>> these in poky and meta-yocto, we can take advantage of the hard
>>>> floating point abi.
>>>
>>> What advantage are you talking about? So far everyone has been unable
>>> to provide real-world numbers[1] that show hardfp making a difference
>>> compared to a properly configured softfp. The numbers debian and
>>> meego are showing are comparing it against completely vfpless builds,
>>
>>
>> That's good reasoning to stick with softfp+neon. Unfortunately I can't
>> find the mail threads that first got me looking into adding hardfp
>> support. As I said, I'm not sold on the idea, but it was requested so I
>> looked into how to address it.
>>
>> If nobody comes forward saying they would really like to have this, I'm
>> going to modify the patch series to disable hardfp by default, but leave
>> the infrastructure in place so people can enable if they like.
> 
> Well, are there some softfp related config bits we need on the yocto
> side that meta-ti has, in order to bring that performance back in
> line?

Are you referring to a specific performance measure?

Jason, Koen, are there any such config bits? We are currently using the
cortexa8-neon tune configuration from oe-core.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel