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cpuctl not working

This is on a 5.99.60 system built from sources updated via anoncvs on 2012-01-18 at 05:04:58 UTC. I have downloaded the "latest" microcode from the amd support site, and copied it into the /libdata/firmware/... directory.

{101} ls -l /libdata/firmware/x86/amd/
total 4
-rw-r--r--  1 root  wheel  2644 Jan 21 15:46 microcode_amd_fam15h.bin
{102} /usr/sbin/cpuctl ucode
cpuctl: IOC_CPU_UCODE_APPLY: No such file or directory
{103} /usr/sbin/cpuctl ucode /libdata/firmware/x86/amd/microcode_amd_fam15h.bin
cpuctl: /libdata/firmware/x86/amd/microcode_amd_fam15h.bin: No such file or 
{104} ls -l /dev/cpuctl
crw-rw-rw-  1 root  wheel  188, 0 Aug  8  2007 /dev/cpuctl
{105} /usr/sbin/cpuctl identify 0
cpu0: AMD Unknown AMD64 CPU (686-class), 3214.44 MHz, id 0x100fa0
cpu0: features  0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features  0x178bfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2>
cpu0: features  0x178bfbff<HTT>
cpu0: features2 0x802009<SSE3,MONITOR,CX16,POPCNT>
cpu0: features3 0xefd3fbff<3DNOW2,3DNOW>
cpu0: "AMD Phenom(tm) II X6 1090T Processor"
cpu0: I-cache 64KB 64B/line 2-way, D-cache 64KB 64B/line 2-way
cpu0: L2 cache 512KB 64B/line 16-way
cpu0: L3 cache 6MB 64B/line 48-way
cpu0: ITLB 32 4KB entries fully associative, 16 2MB entries fully associative
cpu0: DTLB 48 4KB entries fully associative, 48 2MB entries fully associative
cpu0: L2 ITLB 512 4KB entries 4-way
cpu0: L2 DTLB 512 4KB entries 4-way, 128 2MB entries 2-way
cpu0: L1 1GB page DTLB 48 1GB entries fully associative
cpu0: L2 1GB page DTLB 16 1GB entries 8-way
cpu0: Initial APIC ID 0
cpu0: AMD Power Management features: 0x3f9<TS,TTP,HTC,STC,100,HWP,TSC,CPB>
cpu0: SVM Rev. 1
cpu0: SVM NASID 64
cpu0: SVM features 0x40f<NP,LbrVirt,SVML,NRIPS,PauseFilter>
cpu0: family 0f model 0a extfamily 01 extmodel 00
cpu0: UCode version: 0x10000bf

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