Can't use AC97 sound in 5.4

[VnPenguin]

Hi list,
Just installed 5.4. it works fine except my AC97 on board sound.

I added a line in /boot/loader.conf :

snd_ich_load="YES"

But when I run xmms, there is always error like:

** WARNING **: oss_open(): Failed to open audio device (/dev/dsp): No
such file or directory

Here is info about my sound card:

# pciconf -lv | grep -B4 audio
none1 at pci0:17:5:        class=0x040100 card=0x30051695 chip=0x30591106
rev=0x50 hdr=0x00
    vendor   = 'VIA Technologies Inc'
    device   = 'VT8233/33A/8235/8237 AC97 Enhanced Audio Controller'
    class    = multimedia
    subclass = audio

Any help please.
Thank you,