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Similar to the NVIDIA Linux Driver Set, the user can decide if the NVIDIA
driver should use its internal AGP GART driver or if it should rely on an
OS provided AGP GART driver with the "NvAGP" XFree86 config file option:

 - Option "NvAGP" "0"       Disable AGP
 - Option "NvAGP" "1"       Use NVIDIA's AGP GART Driver
 - Option "NvAGP" "2"       Use the OS AGP GART driver (agp.ko)
 - Option "NvAGP" "3"       Attempt "2", fall back to "1"

Unlike Linux, however, this option is not the only controlling factor at
this point; for architectural reasons, the nvidia.ko kernel module must be
built with exclusive support for NVIDIA's AGP GART driver or with support
for FreeBSD's driver and NVIDIA's driver. By default, nvidia.ko is built
with support for NVIDIA's internal driver, only; this can be changed (see
nv-freebsd.h for details).

Please note that if you built nvidia.ko with support for FreeBSD's driver
it will not load unless agp.ko is loaded. agp.ko is special in that you
can not load it after the system boot is complete, you need to append the
following line to /boot/loader.conf to make sure it is pre-loaded:

 # -- load FreeBSD AGP GART driver -- #
 agp_load="YES"

Also note that if agp.ko is loaded, it could conflict with NVIDIA's AGP
GART driver (NvAGP), resulting in stability problems; for this reason, the
NVIDIA driver will abort NvAGP initialization when it detects agp.ko.

Note that current FreeBSD releases are shipped with agp.ko built into the
kernel, which will need to be rebuilt without 'device agp'. Very recent
-CURRENT kernels allow disabling agp.ko via device hints; if you're using
such a kernel, adding the following to /boot/device.hints is sufficient:

 hint.agp.0.disabled="1"

If you're using FreeBSD 5.2.1 or another -CURRENT kernel that does not yet
offer this functionality, the following patch will enable it:

 /usr/X11R6/share/doc/NVIDIA_GLX-1.0/agp.ko-hints.diff

The patch can be applied like this:

 cd /usr/src/sys/
 patch -p2 -i /usr/X11R6/share/doc/NVIDIA_GLX-1.0/agp.ko-hints.diff

When built with support for FreeBSD's AGP GART driver, nvidia.ko will fall
back to using NvAGP when it doesn't detect agp.ko (this will be the case
when agp.ko does not support your chipset or was explicitely disabled with
device hints). It is highly recommended that you use the NVIDIA NvAGP AGP
GART driver.

Please review the NVIDIA Linux Driver Set README for a complete list of AGP
chipsets supported by the NVIDIA AGP GART driver.

- Option "NvAGP" "0" Disable AGP
- Option "NvAGP" "1" Use NVIDIA's AGP GART Driver
- Option "NvAGP" "2" Use the OS AGP GART driver (agp.ko)
- Option "NvAGP" "3" Attempt "2", fall back to "1"

A kada kompajliram kernel sa isključenom opcijom, znači sa
#device agp
rekompajliram kernel i instaliram drajver, zamenim u xorg.conf "nv" za "nvidia" i
startx
kaže mi, nešto kao
X server fatal error Failed to open /dev/io ......