opl does not attach to cmpci

[Radosław Kujawa <radoslaw.kujawa%altkom.pl@localhost>]

Hi.
  I have following problem: opl device is compiled in, but it does not
attach to cmpci device. I'm running -current on amd64. Problem appears
on GENERIC and on custom kernels.

workstation: {2} uname -a
NetBSD workstation.local 4.99.54 NetBSD 4.99.54 (GENERIC) #0: Sun Feb 24
11:33:38 UTC 2008 
builds%b1.netbsd.org@localhost:/home/builds/ab/HEAD/amd64/200802240000Z-obj/home/builds/ab/HEAD/src/sys/arch/amd64/compile/GENERIC
amd64

workstation: {3} dmesg | grep cmpci
cmpci0 at pci2 dev 3 function 0: C-Media Electronics CMI8738/C3DX PCI
Audio Device (rev. 0x10)
cmpci0: interrupting at ioapic0 pin 19 (irq 3)
audio0 at cmpci0: full duplex, mmap, independent
opl at cmpci0 not configured
mpu at cmpci0 not configured

workstation: {4} config -x /netbsd | grep cmpci
cmpci*  at pci? dev ? function ?        # C-Media CMI8338/8738
opl*    at cmpci? flags 1
mpu*    at cmpci?

Is this known problem? If not then how can I debug this?

Greets
Radek