Date: Tue, 13 Jul 2004 18:16:02 +0200 From: Johan Pettersson <manlix@demonized.net> To: ilker.ozupak@emu.edu.tr Cc: freebsd-current@freebsd.org Subject: Re: CPUTYPE=p4 & kernel config Message-ID: <20040713181602.7c01a204.manlix@demonized.net> In-Reply-To: <200407131510.48257.ilker.ozupak@emu.edu.tr> References: <200407121248.42792.ilker.ozupak@emu.edu.tr> <20040712214545.O2496@alpha.siliconlandmark.com> <20040713103802.654daae4.manlix@demonized.net> <200407131510.48257.ilker.ozupak@emu.edu.tr>
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> so here are two different configs > <conf_1> > machine i386 > cpu I486_CPU > cpu I586_CPU > cpu I686_CPU > .... > .... > </conf_1> > > <conf_2> > machine i386 > cpu I686_CPU > .... > .... > </conf_2> > > for the first config i should enable it manually. (for a P4 machine) > > and in second one it is enabled by default so i dont need to add > enable to kern. conf > > should i put options CPU_DISABLE_SSE for P2 and P3 machines? > > would not using disable option on a p2 machine with kern. conf like > second couse any ill effects? like not being able to run the binaries > compiled with -march=pentium4 ... > > and is this enable disable automaticly has anything to do with CPUTYPE > option on the /etc/make.conf > 'options CPU_ENABLE_SSE' is enabled with both conf_1 and conf_2. And you don't need to use CPU_DISABLE_SSE. P3 supports SSE. And in the case with P2, the support for SSE is in the kernel but the cpu doesnt use it. I don't think you can run binaries compiled with -march=pentium4 och a P2... or could you? Please correct me if im wrong. :) No, make.conf don't have any impact on the CPU_ENABLE_SSE-option. CPUTYPE in make.conf just sets -march for kernel/world/ports builds.
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