[fedora-arm] ARMv7 rootfs/repository?
gordan at bobich.net
Wed Dec 22 16:42:11 UTC 2010
Gordan Bobic wrote:
> Chris Tyler wrote:
>> On Wed, 2010-12-22 at 08:01 -0800, Andrew Burgess wrote:
>>> On 12/22/2010 06:30:13 AM, Chris Tyler wrote:
>>>> There is an expected performance gain with the switch to hardfp, but
>>>> that's a big challenge: you can't mix softfp and hardfp, so
>>>> switching to
>>>> hardfp is like bootstrapping an entirely new architecture.
>>> Since fedora has no problem mixing 32 and 64 bit executables it
>>> seems like there's alot of infrastructure already done for this.
>>> Just saying...
>> It's not a Fedora infrastructure issue, the ABIs are incompatible. I
>> wish you could mix'n'match but that doesn't look possible.
> What about kernel level FPU emulation? Is there such a thing? I could
> have sworn there used to be something that could be used as such. And it
> might be possible to make it quite transparent if it isn't required (so
> you can always have it in the kernel). Have the kernel trap the
> exception on the missing FPU instructions, save state, and then pass the
> to an emulation library. When that returns, restore state and resume.
> It would mean much slower performance than softfp on FPU-less hardware,
> but it would allow for a transitional period where only VFP distro needs
> to be maintained, which still works (albeit slowly) on a non-VFP processor.
> Then again, I'm not volunteering to add such a feature to the Linux
> kernel. :)
And just as I hit send, I found this:
No idea how relevant it might still be - the article is about 11 years old.
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