mdev : How to have kernel do modprobes ?

[linuxcbon linuxcbon]

Hi,

I need the kernel to "auto" modprobe ("radeon" for example)

What my rc.sysinit has  :
- mount : /dev , /proc, /sys, /tmp, /var and / as root
- "mdev -s" , which only creates /dev files

I don't know what's missing so the kernel does "radeon" and all needed
modprobes...

Thanks in advance