Added Help info for Permedia 3 and Toshiba TX3912 graphics card support.

drivers/video/Config.help

@@ -68,6 +68,12 @@ CONFIG_FB_PM2_CVPPC
   Say Y to enable support for the Amiga Phase 5 CVisionPPC BVisionPPC
   framebuffer cards.  Phase 5 is no longer with us, alas.
 
+CONFIG_FB_PM3
+  This is the frame buffer device driver for the 3DLabs Permedia3
+  chipset, used in Formac ProFormance III, 3DLabs Oxygen VX1 &
+  similar boards, 3DLabs Permedia3 Create!, Appian Jeronimo 2000
+  and maybe other boards.
+
 CONFIG_FB_AMIGA
   This is the frame buffer device driver for the builtin graphics
   chipset found in Amigas.
@@ -587,6 +593,12 @@ CONFIG_FB_IMSTT
   The IMS Twin Turbo is a PCI-based frame buffer card bundled with
   many Macintosh and compatible computers.
 
+CONFIG_FB_TX3912
+  The TX3912 is a Toshiba RISC processor based on the MIPS 3900 core;
+  see <http://www.toshiba.com/taec/components/Generic/risc/tx3912.htm>.
+
+  Say Y here to enable kernel support for the on-board framebuffer.
+
 CONFIG_FB_VIRTUAL
   This is a `virtual' frame buffer device. It operates on a chunk of
   unswappable kernel memory instead of on the memory of a graphics