On Friday 10 March 2006 09:11, Bo Andresen <[EMAIL PROTECTED]> wrote about 'Re: [gentoo-amd64] upgrading from 2005.0 x86, to 2006.0 amd64': > On Friday 10 March 2006 14:51, Mike Williams wrote: > > At the moment it's happily running a 32bit kernel, with 32bit > > userland. From my experimentation last night, I suspect I will need to > > boot an amd64 livecd to compile a proper 64bit kernel, which will > > enable me to compile a 64bit toolchain. > > Could not compile a 64bit kernel, or a multilib gcc, from the 32bit > > kernel. > > You might want to have a look at this recent thread from the gentoo-user > mailing list. Boyd helped me to compile a 64 bit kernel from 32 bit > kernel and user land using a cross compiler. It was actually quite easy. > The 64 bit user land I got from the amd64 stage3 tarball. This was a > fresh install but using a 32 bit live cd.
Heh. Bo, you beat me to the punch. That's what I get for working 11 hour days. :P > http://groups.google.com/group/linux.gentoo.user/browse_thread/thread/e4 >629ea8751a9ab4/815dbc64722b7d49%23815dbc64722b7d49?sa=X&oi=groupsr&start= >1&num=3 > > I think the important steps for compiling a 64 bit kernel were: > > To get a working cross compiler: > #emerge crossdev > #crossdev -s1 -t x86_64 > > To configure a 64 bit kernel using that cross compiler: > #cd /usr/src/linux > #make ARCH=x86_64 CROSS_COMPILE=x86_64-pc-linux-gnu- Probably want to stick a menuconfig / config / xconfig on the end of that command line. > In my case the include/asm symlink pointed towards asm-386 > # ls -ld include/asm > lrwxrwxrwx 1 root root 10 Feb 24 14:27 include/asm -> asm-386 As I mentioned in our thread, post-mortem, I think a 'make mrproper' would clear up this symlink, so that the next 'make' would re-create it. > Compile 64 bit kernel: > #make ARCH=x86_64 CROSS_COMPILE=x86_64-pc-linux-gnu- > #make ARCH=x86_64 CROSS_COMPILE=x86_64-pc-linux-gnu- modules_install Also, make sure that while you have a 32-bit userland (or are using multilib) that you select the kernel option for supporting 32-bit code. I believe it's referred to as IA32 executable support. The exact config option should be in that above thread. After you get a 32-bit kernel, you should be able to change your make. {conf,profile} (you'll want to check your CHOST and ACCEPT_KEYWORDS, at a minimum) then emerge -e world for a nice 64-bit userland. You may, however, run into some packages that you have to downgrade or do without -- not everything keyworded x86 is also keywords amd64, for better or worse. -- "If there's one thing we've established over the years, it's that the vast majority of our users don't have the slightest clue what's best for them in terms of package stability." -- Gentoo Developer Ciaran McCreesh -- gentoo-amd64@gentoo.org mailing list
