cpufreq not working as module on i386/amd64

Hi all,

I found that cpufreq driver failed to attach when compiled as module
and loaded, but it works fine when compiled into kernel. I am
wondering if this is due to some kind of limitation, or can be fixed?

Tested on a Pentium E5200 desktop (i386) and a Pentium T4200 laptop
(amd64). Both got the same result. dmesg of T4200 attached.

kldload module:
----->8----->8----->8-----
est0: <Enhanced SpeedStep Frequency Control> on cpu0
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 6194c1a06004c1a
device_attach: est0 attach returned 6
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 6194c1a06004c1a
-----8<-----8<-----8<-----
(repeated 6 times, kldload retries?)

compiled into kernel:
----->8----->8----->8-----
...
fdc0 failed to probe at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
uart1: <ns8250> failed to probe at port 0x2f8-0x2ff irq 3 on isa0
isa_probe_children: probing PnP devices
coretemp0: <CPU On-Die Thermal Sensors> on cpu0
coretemp0: Setting TjMax=104
p4tcc0: <CPU Frequency Thermal Control> on cpu0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
coretemp1: <CPU On-Die Thermal Sensors> on cpu1
coretemp1: Setting TjMax=104
p4tcc1: <CPU Frequency Thermal Control> on cpu1
est1: <Enhanced SpeedStep Frequency Control> on cpu1
Device configuration finished.
procfs registered
...
-----8<-----8<-----8<-----

Jia-Shiun.