My understanding of this issue is that it is really a GCC bug, since GCC
uses CMOV when compiling for 686, even though it is an optional
instruction.
The traditional work-around is to compile for 586. I believe kernel
option CONFIG_M586=y should fix this.
Note that current Ubuntu Server kernels already don't boot on C3 and
other CPUs since they have CONFIG_M686=y.
** Also affects: gcc-defaults (Ubuntu)
Importance: Undecided
Status: New
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Ubuntu 8.10 Alpha-3 Intrepid Ibex - Via C3 CPU not Supported
https://bugs.launchpad.net/bugs/254453
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