Installation gentoo:carte ati non reconnu

Bonjour,
j'ai installé gentoo ppc (imac dv 450 / 32bits) le serveur est installé, maintenant il me reste à activé la carte graphique ATI rage 128. et c'est là le problème... donc je n'ai pas pour l'instant d'environnement graphique.
startx
xauth: creating new authority file /root/.serverauth.9087


X.Org X Server 1.8.2
Release Date: 2010-07-01
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.34-gentoo-r12 ppc Gentoo
Current Operating System: Linux tux 2.6.34-gentoo-r12 #1 SMP Mon Nov 22 13:50:38 CET 2010 ppc
Kernel command line: root=/dev/hda4 ro ramdisk_size=8192
Build Date: 27 November 2010 03:36:43PM

Current version of pixman: 0.18.2
Before reporting problems, check https://www.x.org/wiki/
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sat Nov 27 17:15:11 2010
(==) Using config file: "/etc/X11/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(EE) module ABI major version (6) doesn't match the server's version (7)
(EE) Failed to load module "ati" (module requirement mismatch, 0)
(EE) Failed to load module "fbdev" (module does not exist, 0)
(EE) No drivers available.

Fatal server error:
no screens found

Please consult the The X.Org Foundation support
at https://www.x.org/wiki/
for help.
Please also check the log file at "/var/log/Xorg.0.log" for additional information.

xinit: giving up
xinit: unable to connect to X server: No such file or directory
xinit: server error


merci d'avance pour votre aide