[PATCH] Set cpu explicitly in kernel compiles
kumar.gala at freescale.com
Fri May 6 00:00:50 EST 2005
On May 5, 2005, at 7:24 AM, Dan Malek wrote:
> On May 5, 2005, at 1:22 AM, Paul Mackerras wrote:
> > If you think we should have -mcpu=xxx on the command line for 4xx,
> > 44x, 8xx, etc., then that's fine, but that is a separate problem
> > what my patch was addressing (one which my patch might make it
> > to fix, though).
> I think that is exactly what we want, although I don't know how that is
> separate from the patch you sent. My original comment was the patch
> fixes the problem for only one of the cpu cores, not all of them.
> then led into the subsequent suggestion of making the biarch work
> like the past compilers, and we must specific the flags for POWER4
> instead of the other way around. Without explicit -mcpu flags, the
> existing compiler behavior is just fine ..... but, I guess I'd be
> in the way of progress to want this :-)
I agree with Dan here. I think we should go ahead and extend the patch
to set -mcpu and -mtune flags for the list of processors we have in
"Processor Type". If I'm building a kernel for e500 or 4xx I might as
well get a kernel that is tuned a bit more for the subarch.
Additionally, there should be some expert override ability, so if I
really want to do -mcpu=7455 -mtune=7455 I can.
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