john wendel wrote:
john wendel wrote:
Much to my surprise, there isn't a 32 vs 64 bit toggle in the kernel
config. Google confused me, but did tell me I require a 64bit
toolchain. This seems bogus, since the kernel is self contained. I
think it should be enough just to set the proper gcc options.
...
Yes, I'll do a 64bit F10. Just wanted to experiment, and maybe learn a
little something while I'm waiting for F10.
If that's your goal, you can do that. You do need a 64 bit toolchain.
If you run "gcc --help -v" you'll notice that ld doesn't support 64 bit
targets.
The first thing you'll need to do is build the toolchain for 64 bit
cross-compiling. Once that's available, you should be able to use it to
create a 64 bit kernel. That's pretty much the way that you'd always
build an OS for a foreign CPU. Build the toolchain first, then compile
the OS using that toolchain, then create a boot disk using the
cross-compiled binaries. Don't get confused by the fact that 64 bit
CPUs are backward compatible. You need to treat them like a completely
foreign CPU.
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