Issue resolved.  Purely a bios config problem complicated by the lack of a
conventional bios interface.  All is reporting and responding fine:

mainbus0: Intel MP Specification (Version 1.4) (COMPAQ   PROLIANT    )
cpu0 at mainbus0: apid 3 (boot processor)
cpu0: Intel Pentium III Xeon (686-class), 902.12 MHz, id 0x6a4
cpu0: features 383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features 383fbff<PGE,MCA,CMOV,PAT,PSE36,MMX>
cpu0: features 383fbff<FXSR,SSE>
cpu0: I-cache 16 KB 32B/line 4-way, D-cache 16 KB 32B/line 4-way
cpu0: L2 cache 2 MB 32B/line 8-way
cpu0: ITLB 32 4 KB entries 4-way, 2 4 MB entries fully associative
cpu0: DTLB 64 4 KB entries 4-way, 8 4 MB entries 4-way
cpu0: calibrating local timer
cpu0: apic clock running at 100 MHz
cpu0: 64 page colors
cpu1 at mainbus0: apid 1 (application processor)
cpu1: starting
cpu1: Intel Pentium III Xeon (686-class), 902.05 MHz, id 0x6a4
cpu1: features 383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu1: features 383fbff<PGE,MCA,CMOV,PAT,PSE36,MMX>
cpu1: features 383fbff<FXSR,SSE>
cpu1: I-cache 16 KB 32B/line 4-way, D-cache 16 KB 32B/line 4-way
cpu1: L2 cache 2 MB 32B/line 8-way
cpu1: ITLB 32 4 KB entries 4-way, 2 4 MB entries fully associative
cpu1: DTLB 64 4 KB entries 4-way, 8 4 MB entries 4-way
cpu2 at mainbus0: apid 2 (application processor)
cpu2: starting
cpu2: Intel Pentium III Xeon (686-class), 902.05 MHz, id 0x6a4
cpu2: features 383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu2: features 383fbff<PGE,MCA,CMOV,PAT,PSE36,MMX>
cpu2: features 383fbff<FXSR,SSE>
cpu2: I-cache 16 KB 32B/line 4-way, D-cache 16 KB 32B/line 4-way
cpu2: L2 cache 2 MB 32B/line 8-way
cpu2: ITLB 32 4 KB entries 4-way, 2 4 MB entries fully associative
cpu2: DTLB 64 4 KB entries 4-way, 8 4 MB entries 4-way

Many thanks for suffering me...

peter