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Message-ID: <45D0FC66.5030205@simon.arlott.org.uk>
Date: Mon, 12 Feb 2007 23:46:46 +0000
From: Simon Arlott <simon@arlott.org>
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To: Dave Jones <davej@redhat.com>, Kyle McMartin <kyle@mcmartin.ca>,
       Mark de Vries <mark@asphyx.net>, linux-kernel@vger.kernel.org
Subject: Re: Which CPU for VIA C7/Esther?
References: <1171301858.3557.6.camel@localhost> <20070212191441.GB20686@athena.road.mcmartin.ca> <20070212201635.GD10697@redhat.com>
In-Reply-To: <20070212201635.GD10697@redhat.com>
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On 12/02/07 20:16, Dave Jones wrote:
> On Mon, Feb 12, 2007 at 02:14:41PM -0500, Kyle McMartin wrote:
>  > On Mon, Feb 12, 2007 at 06:37:38PM +0100, Mark de Vries wrote:
>  > > I've been googeling for about an hour now and can't find an answer=
 to:
>  > > What type of CPU should I select when compiling a recent 2.6 kerne=
l if I
>  > > have a VIA Esther CPU?
>  >=20
>  > > stepping        : 9
>  >=20
>  > config MVIAC3_2
>  >         bool "VIA C3-2 (Nehemiah)"
>  >         help
>  >           Select this for a VIA C3 "Nehemiah". Selecting this enable=
s usage
>  >           of SSE and tells gcc to treat the CPU as a 686.
>  >           Note, this kernel will not boot on older (pre model 9) C3s=
=2E
>  >=20
>  > Is the one you want, I believe.
>=20
> The C7 doesn't seem to care much which you optimise it for.
> Any of the 686 options should work just fine, but MVIAC3_2 is no
> worse than any of the others.
>=20

MVIAC3_2 doesn't enable X86_GOOD_APIC, try M686 (Pentium-Pro) - but that =
won't enable MMX and SSE (via -march=3Dc3-2).
These CPUs support SSE2 too... there should probably be an option for C7 =
that passes 686/mmx/sse/sse2 to gcc. (The c3-2 option could even cause gc=
c to alter code for the C3-2 that's not necessary for the C7, but I've no=
t checked what else gcc does with -march=3Dc3-2).

Also, for the C7 you'll want CRYPTO_DEV_PADLOCK_* (Hardware Crypto Device=
s, Support for VIA PadLock ACE) and HW_RANDOM_VIA (VIA HW Random Number G=
enerator support).

--=20
Simon Arlott


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