Date: Fri, 5 Oct 2012 00:43:08 -0700 From: Garrett Cooper <yanegomi@gmail.com> To: =?ISO-8859-1?Q?Dag=2DErling_Sm=F8rgrav?= <des@des.no> Cc: Konstantin Belousov <kostikbel@gmail.com>, Dimitry Andric <dimitry@andric.com>, Andriy Gapon <avg@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: x86 boot code build Message-ID: <CAGH67wTpZEfMVg_2O%2BFknJ4hu0HpHhPkFog38c_tT8yCFV%2BSCw@mail.gmail.com> In-Reply-To: <CAGH67wQqs9DJoy0LSgKi1_wMFyrHUE69Dgc2dht7q8VXDVAeQQ@mail.gmail.com> References: <506C385C.3020400@FreeBSD.org> <506DEB4C.5020508@andric.com> <86haq9hq2c.fsf@ds4.des.no> <20121005033244.GL35915@deviant.kiev.zoral.com.ua> <86y5jll7kc.fsf@ds4.des.no> <CAGH67wQqs9DJoy0LSgKi1_wMFyrHUE69Dgc2dht7q8VXDVAeQQ@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, Oct 5, 2012 at 12:40 AM, Garrett Cooper <yanegomi@gmail.com> wrote: > On Fri, Oct 5, 2012 at 12:08 AM, Dag-Erling Sm=F8rgrav <des@des.no> wrote= : >> Konstantin Belousov <kostikbel@gmail.com> writes: >>> Dag-Erling Sm=F8rgrav <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. > > I would target the appropriate architecture (amd64) where it > matters (amd64), and target the lowest sane common denominator on > i386. In reality, what does a couple MB mean on amd64 vs i386? To clarify... s/couple MB/couple MB in the loader program/ Thanks, -Garrett
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAGH67wTpZEfMVg_2O%2BFknJ4hu0HpHhPkFog38c_tT8yCFV%2BSCw>