Re: [PATCH 1/4] OMAP: DMA: Cleanup of DMA Request Lines

[Tony Lindgren <tony@atomide.com>]

* Woodruff, Richard <r-woodruff2@ti.com> [071031 06:19]:
> > Let's remove the #ifdefs here, we want to be able to compile support
> for
> > 24xx and 34xx into the same kernel eventually. It's OK to have the
> same
> > DMA request channel defined in different way for 24xx and 34xx.
> 
> One question here is will that happen practically?  Maybe it will, not
> sure.  The same sentiments were made about OMAP1 vs. OMAP2.  The
> structure which results from the sharing intent perhaps is net positive
> but I don't see them converging.
> 
> People would likely compiled 3430 for ARMv7 and ARMv6 for 24xx.  Some
> new instructions and the like are around.  I don't that its fully
> pluggable at the architecture level even.

Recent gcc allows mixing in assembly for later cores, so it's not a
problem. Sure you can optimize it for one core by not selecting anything
else.

> EABI if really used might allow some fancy solutions in theory but I
> wonder if those will develop.  Not to say this the only way.

It may take a while, but let's not add any new barriers to compile in
multiple cores.

Regards,

Tony