Date: Fri, 05 Oct 2012 09:08:35 +0200 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Dimitry Andric <dimitry@andric.com>, Andriy Gapon <avg@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: x86 boot code build Message-ID: <86y5jll7kc.fsf@ds4.des.no> In-Reply-To: <20121005033244.GL35915@deviant.kiev.zoral.com.ua> (Konstantin Belousov's message of "Fri, 5 Oct 2012 06:32:44 %2B0300") References: <506C385C.3020400@FreeBSD.org> <506DEB4C.5020508@andric.com> <86haq9hq2c.fsf@ds4.des.no> <20121005033244.GL35915@deviant.kiev.zoral.com.ua>
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Konstantin Belousov <kostikbel@gmail.com> writes: > Dag-Erling Sm=C3=B8rgrav <des@des.no> writes: > > Dimitry Andric <dimitry@andric.com> writes: > > > Well, do we still officially support any real i386 machines? > > No, 486 and up only. Personally, I think we should ship 586 > > binaries (pentium-mmx) by default. > There is absolutely no architectural difference between usermode ISA > between i386 and pentiums, ignoring SMP-support instructions, which > are usually not emited by the compiler anyway. By "binaries" I mean ISOs and freebsd-update, including the kernel. (actually, it's the kernel I care the most about) > Really interesting stuff started appearing with pentium pro, like CMOV > instructions. Even more important, -march=3Dpentiumpro generates much > better -fPIC code (probably could be activated by -mcpu=3Dpentiumpro). Which is why most Linux distributions target 686, but we can't if we want to support small systems like the AMD Geode-based soekris net4xxx and net5xxx out of the box. DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no
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