From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zachary Amsden Subject: Re: 2.4.26-xen0 unresolved symbol _mmx_memcpy in USB modules Date: Wed, 25 Aug 2004 01:17:11 -0700 Sender: xen-devel-admin@lists.sourceforge.net Message-ID: <412C4B07.9090403@vmware.com> References: <35595.161.85.127.139.1093351536.squirrel@hoth.xs4all.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <35595.161.85.127.139.1093351536.squirrel@hoth.xs4all.nl> Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Mark Hurenkamp Cc: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org In general, modules for different processors or subarchitectures are not cross compatible. Modules compiled for Athlon will use MMX instructions to do fast memcopy, but a kernel compiled for Pentium II does not export the _mmx_memcpy symbol for modules to use - not because it's not supported, but because it's just not as fast on Pentium II. You should be able to use modules which are a strict ancestor of the current kernel architecture without problems - i.e. a 386 module in a Pentium II kernel should not cause grief. YMMV. I highly recommend using modules compiled for the same kernel configuration, however. Cheers, Zach Mark Hurenkamp wrote: >Hi, > >I've been playing with the 2.4.26 and 2.4.27 xen0 kernels, and at some >point I noticed that I was unable to load the USB modules anymore because >of an unresolved _mmx_memcpy symbol...A bit of fiddling with my settings showed that when I build all my USB >modules in the kernel, the problem goes away, or alternately, if I switch >back from Athlon to Pentium II cpu (which was my original setting). >So for now I'm using the Pentium II as my CPU selection, but I was just >wondering if this is a known problem, or if I stumbled across something >new :-) ? >Warm regards, >Mark. > > > > > >------------------------------------------------------- >SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media >100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 >Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. >http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 >_______________________________________________ >Xen-devel mailing list >Xen-devel@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/xen-devel > > ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285