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kernel will not build x86-64 on core2 processor [solved]
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rickj
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PostPosted: Thu Dec 10, 2015 11:10 pm    Post subject: kernel will not build x86-64 on core2 processor [solved] Reply with quote

on a new install, configuring (in menuconfig):

Processor type and features->processor family->Core 2/newer neon

or even

Processor type and features->processor family->Generic-x86-64

I get the error message:

usr/initramfs_data.S:1:0: error: CPU you selected does not support x86-64 instruction set

I don't seem to be able to find any other place where the CPU type is selected. Can anyone tell me what I am missing here?


Last edited by rickj on Fri Dec 11, 2015 10:52 pm; edited 1 time in total
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Atom2
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PostPosted: Thu Dec 10, 2015 11:40 pm    Post subject: Reply with quote

rickj,
What is your exact CPU type. Not every Core2 CPU actually supports a 64bit instruction set. Some of those are only 32bit processors.

Regards Atom2
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rickj
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PostPosted: Thu Dec 10, 2015 11:45 pm    Post subject: Reply with quote

from cat /proc/cpuinfo:

Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz

Which AFAIK is the Wolfdale processor. Intel, at [url] http://ark.intel.com/products/33911[/url] shows this as 64 bit.
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Atom2
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PostPosted: Fri Dec 11, 2015 12:07 am    Post subject: Reply with quote

rickj,
as far as I can see that is indeed a CPU with 64bit instruction set. This thread here might be able to give you some clues.

Atom2
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rickj
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PostPosted: Fri Dec 11, 2015 10:51 pm    Post subject: Reply with quote

Thanks, Atom2, spot on. I'd stupidly downloaded an x86 stage3 tarball when I needed an x86-64.
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