3.22. I have an internal Plug & Play modem and FreeBSD can't find it.

You will need to add the modem's PnP ID to the PnP ID list in the serial driver. To enable Plug & Play support, compile a new kernel with controller pnp0 in the configuration file, then reboot the system. The kernel will print the PnP IDs of all the devices it finds. Copy the PnP ID from the modem to the table in /sys/i386/isa/sio.c, at about line 1200. Look for the string "SUP1310" in the structure "siopnp_ids[]" to find the table. Build the kernel again, install, reboot, and your modem should be found.

You may have to manually configure the PnP devices using the `pnp' command in the boot-time configuration with a command like

   pnp 1 0 enable os irq0 3 drq0 0 port0 0x2f8