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Message-ID: <20112.1193774645@redhat.com>
Date: Tue, 30 Oct 2007 20:04:05 +0000
From: David Howells <dhowells@...hat.com>
To: "Suzuki Takashi" <suzuki.takashi@...il.com>
Cc: dhowells@...hat.com, torvalds@...l.org, akpm@...ux-foundation.org,
linux-am33-list@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [Linux-am33-list] [PATCH 2/2] MN10300: Add the MN10300/AM33 architecture to the kernel [try #2]
Suzuki Takashi <suzuki.takashi@...il.com> wrote:
> Does this mean cpu-am33v3, cpu-am33v4, etc. will be created
> when a new core comes up?
Yes. Note that the headers in a later one can 'inherit' from those of an
earlier one simply by #including that earlier one, much like archs do with
asm-generic headers.
> Isn't it possible to split codes by features, instead of target cores?
Perhaps, but I personally am not in a position to judge what features are
common to what CPUs. I'll have to let someone from MEI answer that one. I'll
discuss it with them.
> If similar codes were in multiple files and directories, it would be
> hard to maintain them.
#include is a wonderful thing.
> > +#ifdef CONFIG_MN10300_PROC_MN103E010
> > + nop
> > + nop
> > + nop
> > +#endif
>
> This should be conditioned by a feature.
> Isn't it a feature or a limitation that several non-FPU instructions are
> necessary just after the EPSW_FE is set?
Or it could just be a h/w bug in this particular processor. I can always
patch it later to change the name. Whatever it is, I suspect it will always
be controlled implicitly.
> Are these specific to MN103E010, or applicable to some other LSIs?
Yes.
> If they are not specific to MN103E010, the file names aren't good.
I realise that, but I haven't been able to get any better names for them.
> Stranger names here.
How so?
David
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