PERFMON with Athlon breaks ata.

[Joseph Koshy]

> A custom kernel compiled with options PERFMON and cputype=athlon when ran on
> an athlon causes ATA to not probe devices on FreeBSD 6.0-RELEASE.  dmesg
> seems normal except the ata probe is never done, so the only boot devices
> available is the floppy.

AFAIR, "PERFMON" only supports Pentium and Pentium Pro CPUs.

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