After some hacking around, I put together xf86-video-ati on pure 64 for my older Compaq 6910p laptop. All up and running [whew!].
I'll properly pack up xf86-video-ati and misc unless there is already a team headed that way (Curaga, Juanito?).
If anyone else goes down this route, the X2300 dislikes (= panic/hang) the default KMS in Xorg-7.7. So:
* add "nomodeset" and "radeon.modeset=0" to kernel args
* reload the module at the end of bootsync.sh using "modprobe -r radeon" then "modprobe radeon modeset=1". The driver must be reloaded with KMS turned back on or Xorg falls back on VESA.
For reference:
3.8.13-tinycore64
HP/Compaq 6910p
AMD/ATI Mobility Radeon X2300 [RV516/M64-S]
Xorg 7.7