PowerBook G4
I'm running Debian squeeze on a 12" PowerBook G4 and these are some of my notes about the configuration. This is may not work for your hardware so take with a grain of salt.
Hardware
CPU Info
cat /proc/cpuinfo
processor : 0
cpu : 7447A, altivec supported
clock : 1333.333000MHz
revision : 1.1 (pvr 8003 0101)
bogomips : 73.72
timebase : 18432000
platform : PowerMac
model : PowerBook6,4
machine : PowerBook6,4
motherboard : PowerBook6,4 MacRISC3 Power Macintosh
detected as : 287 (PowerBook G4 12")
pmac flags : 0000001a
L2 cache : 512K unified
pmac-generation : NewWorld
Memory : 768 MB
Ethernet
lspci | grep Ethernet
0002:20:0f.0 Ethernet controller: Apple Inc. UniNorth 2 GMAC (Sun GEM) (rev 80)
WLAN
lspci | grep Wireless
0001:10:12.0 Network controller: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller (rev 03)
Framebuffer
lspci | grep VGA
0000:00:10.0 VGA compatible controller: NVIDIA Corporation NV34M [GeForce FX Go5200] (rev a1)
Sound
snd-powermac