> No. User mode linux doesn't run on your P4.. it runs on Linux. It
> doesn't talk to the hardware directly.
Compiling for i686 vs i386 refers to the instructions that the compiler is
allowed to use (although in the x86 kernel, this also selects CPU features,
chip errata workarounds, etc). So, it makes sense to compile UML for i686,
there's just no config option to make that happen.