On Tue, 23 Nov 2010 22:10:02 +0100, Neil Bothwick wrote about Re: [gentoo-user] Re: i486:
>On Tue, 23 Nov 2010 18:36:49 +0000, David W Noon wrote: > >> >CFLAGS="-O2 -march=geode -pipe -fomit-frame-pointer" >> >CXXFLAGS="${CFLAGS}" >> >CHOST="i486-pc-linux-gnu" >> >> Try using i686 instead. >> >> >flags : fpu de pse tsc msr cx8 pge cmov mmx mmxext >> >3dnowext >> >> You have CMOV and MMX, as well as 3DNow! instructions -- with >> extensions. That makes it an Athlon "lite" processor, or a K6-3 with >> CMOV instructions. These are enough to make it compatible with the >> Pentium Pro (i686) architecture, and a bit more besides. > >Apparently it's not quite a full i686. The research I did at the time >indicated that using anything higher than i486 was asking for problems. I am a little surprised by that. I ran a couple of K6-3 boxes for some few years using i586. As near as I could tell, those processors only lacked CMOV instructions when compared with i686. I find it hard to envisage the Geode lacking any i586 feature, given that it has MMX instructions, CMOV instructions, the CMPXCHG8B instruction and a TSC register -- all of those are way beyond i486. -- Regards, Dave [RLU #314465] *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* dwn...@ntlworld.com (David W Noon) *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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