Incidentally, a 486SX doesn't include an FPU, and Fedora kernels (not surprisingly) don't include emulation code. One other thing for the Original Poster to remember.
He'll have to recompile kernel anyhow, and FPU emulation code is part of kernel. However, OP had 486, so he'll be fine with or without emulation code enabled in kernel. There was somebody else who replied who had 486SX in an laptop.
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