Date: Thu, 28 Jun 2007 11:53:09 -0500 From: eculp@unixmania.com To: freebsd-questions@freebsd.org Subject: Re: Upgrading from an old athlon to a new 64 bit one. Message-ID: <20070628115309.mmzo1h7bxoo4ogkc@intranet.unixmania.com> In-Reply-To: <20070628153529.GA53017@owl.midgard.homeip.net> References: <20070627145452.ytifppt70oc480s8@intranet.unixmania.com> <20070628011057.5a0d90b5@gumby.homeunix.com.> <20070628101239.6fs4qrpz8k8kkosw@intranet.unixmania.com> <20070628153529.GA53017@owl.midgard.homeip.net>
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Quoting Erik Trulsson <ertr1013@student.uu.se>: > On Thu, Jun 28, 2007 at 10:12:39AM -0500, eculp@unixmania.com wrote: >> Quoting RW <fbsd06@mlists.homeunix.com>: >> >> >On Wed, 27 Jun 2007 14:54:52 -0500 >> >eculp@unixmania.com wrote: >> > >> >>I have just stuck the disks from an old AMD Athlon(tm) (1333.39-MHz >> >>686-class CPU) into a new box with an AMD Athlon(tm) 64 Processor >> >>3800+ (2387.78-MHz 686-class CPU). I am still building a daily >> >>kernel with the old configuration and all is well. Of course the >> >>old configuration was/is i386. Now I need to compile for 64 bit >> >>apps. > > No, you do not *need* to compile for 64-bit apps. > > >> > >> >Are you sure about that? there are few compelling reasons to go to >> >64-bit, if you already have a working system. As far as performance is >> >concerned, it may go either way. >> >> Hi RW, >> >> I probably didn't explain very well. I'll try again. >> >> The machines that I am updating are all athlon 32 bit machines, which >> I have been doing a daily cvsup, buildworld, buildkernel, >> installkernel, installworld and weekly portupgrade for several years. >> I just removed the disks from one that is running current and another >> that is running RELENG, both still running kernels cvsup-ed and >> compiled yesterday as well as userland. The ports are also up to date. >> >> What I am trying to do is compile an amd64 kernel, install it and see >> what happens ;) I can always go back to the generic kernel compiled in >> sys/i386. > > It probably will not work very well. > > The compiler on an i386 system does not know how to create amd64 code. > It is not configured to be a crosscompiler - it will only compile to nativ= e > i386 code. > > > There is not really any support for switching from i386 to amd64 by source > code. It can apparently be done if you know what you are doing but it is > not trivial and not documented. > > The normal build system assumes that you are doing a native build by > default. It is possible to build for a different system, but then you > first need to build the necessary cross-tools (compiler, linker, assembler= , > etc.) and then use that to build the rest of the system. > > > > >> If all were to go well, I would then recompile all my ports. >> >> My problem is that when I created a sys/amd64/conf/AMD (just a generic >> kernel with PF added) file and went to /usr/src and tried make >> buildkernel KERNCONF=3DAMD it didn't find the kernel configuration file. >> I tried with paths, etc. and no luck. I also see that my daily >> compiles and installs have not changed userland programs. >> /usr/bin/file shows: >> >> c++: ELF 32-bit LSB executable, Intel 80386, version 1 >> (FreeBSD), dynamically linked (uses shared libs), stripped >> >> Using c++ and an example. I assume it should give a 64-bin executable >> if it were. This particular file was built and installed this morning. >> >> The bottom line is that I'm totally ignorant as to this change and >> have been doing some really dumb searches in that I haven't found what >> I'm missing. I'm convenced that it is something braindead simple but >> I am still looking. >> >> The good news is that both the current and RELENG boxes are working >> well with all as before. >> >> Again any suggestions or even flames with more information are appreciate= d. > > Why don't you just keep running the i386 version of FreeBSD ? > Is there some particular reason you want to use the amd64 version ? Hi Erik, Ignorance, I assume, is my only excuse? At least thanks to your =20 patience and explanation, I understand and am somewhat less ignorant;) =20 Originally, I had ordered these and I was promised that they were =20 dual core and I had to pay in advance. When they finally arrived, I =20 found that they were standard AMD Athlon 3800+ and no x2 so it looks =20 like I was "had" but that will be another story. Then it would have =20 made sense to change to 64 bit. For the moment my problem is solved =20 and I'll stay with 32 bit for now. Thanks, ed
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