On 14 May 2013, Kyle Brantley uttered the following: > On 5/13/2013 1:14 PM, Conrad Kostecki wrote: >> I don't understand. How can a 32-Bit CPU work in 64-Bit Mode? I can't >> image, that the BIOS makes the difference. Linux shows the flags lm, >> which indicated, that it supports "AMD64/EM64T"? >> > > The CPU was produced as a 64-bit chip, but for reasons X or Y or Z, > the manufacturer is only going to support 32-bit. Maybe there are bugs > with respect to 64-bit, maybe it's a marketing thing.
I think it's more that it's slow. IIRC, 64-bit integer multiply is a *lot* slower than on other 64-bit parts: there may be other sloth. I wouldn't be surprised to find that it was slower than 32-bit even accounting for cache effects, where other 64-bit-capable CPUs are faster. > In short, as per Intel, using the 6501 in a 64-bit mode is > unsupported. ... so unsupported that Intel hackers have been adding Atom-specific 64-bit variants of the string routines into glibc of late. :) I suspect it's unsupported in the sense that "we want it to work, we rely on it working, but if you're not a geek don't bother." --- but anyone on this list has their geek credentials just on account of knowing that Soekris exists :) (I must say, having a houe move coming up I'm glad my firewall is a Soekris. It's the only machine I own that I can be *sure* will get to the far end of the car journey without risk of failure. Solid-state FTW!) -- NULL && (void) _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
