Re: [PATCH 0/5] ARM: orion5x/dove/mv78xx0 multiplatform

Jason Cooper
2015-12-11T13:36:08Z

+Josh

Hey Arnd, Detlef,

On Fri, Dec 11, 2015 at 12:10:55AM +0100, Arnd Bergmann wrote:
> On Thursday 10 December 2015 23:00:24 Detlef Vollmann wrote:
> > On 12/10/15 22:29, Arnd Bergmann wrote:
> > > On Thursday 10 December 2015 22:14:25 Detlef Vollmann wrote:
> > >> On 12/10/15 21:59, Arnd Bergmann wrote:
> > > It may also be worth investigating what has made CONFIG_OF so costly,
> > Probably because too much is done at runtime and too few things can
> > be fixed at build time.
> >
> > > maybe we can reduce this a bit again.
> > Probably not without turning the wheel backward :-(
> >
> > So for the test: yes it works, but I'm unhappy with it.
>
> I'm not too happy about adding 80kb to the uncompressed kernel
> image either. I've spent some more time now trying to find where
> we added the bloat. It's mainly in drivers, not in arch specific
> code, a kilobyte here and there eventually adds up, but the largest
> portion with a little over 50% of the total diff is drivers/of.

Wasn't there an idea kicked around a while ago to create a
dt2boardfile script/executable*? Then, during kernel configuration, you
enable it and select which dts file you want. It would disable
CONFIG_OF, multiplatform, etc. And generate a board_file.c from the dts
file.

If anything, it might be worth asking the kernel tinification [1], [2]
folks if they'd be interested in taking this on...

thx,

Jason.

* This may have been completely in my head...

[1] http://events.linuxfoundation.org/sites/events/files/slides/tiny.pdf
[2] https://tiny.wiki.kernel.org/