[U-Boot] [PATCH 1/1] arm: Migrate SYS_THUMB_BUILD to Kconfig, introduce SPL_SYS_THUMB_BUILD

[Tom Rini]

On Tue, Mar 07, 2017 at 12:44:59AM +0200, Siarhei Siamashka wrote:
> Hi Tom,
> 
> On Mon,  6 Mar 2017 13:50:10 -0500
> Tom Rini <trini at konsulko.com> wrote:
> 
> > Today, we have cases where we wish to build all of U-Boot in Thumb2 mode for
> > various reasons.  We also have cases where we only build SPL in Thumb2 mode due
> > to size constraints and wish to build the rest of the system in ARM mode.
> 
> Is there a good real world example of this particular use case? Even if
> there is enough space for having the U-Boot binary built in ARM mode,
> Thumb2 is still smaller and loads faster. And having reduced boot time
> is always nice.

So, good question.  At the moment, I'm not trying to change existing
behavior.  I also seem to recall that Thumb2 being a performance win
depends on what you're doing.  It would certainly be worth doing some
tests to see if on say Allwinner where today we don't do the main U-Boot
in Thumb2 mode there is a noticable change as it looked like a pretty
big size win.

-- 
Tom
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