"AtomDis serves as a BIOS disassembler and table dumper
to the AtomBIOS, which is the video BIOS abstraction layer used on
ATI GPUs since around the R400 series. The AtomBIOS and debate over
its usage was what originally caused the two competing drivers
(xf86-video-ati and xf86-video-radeonhd) for the same hardware up
until the RadeonHD driver ended up adopting AtomBIOS for use in
supporting newer ATI GPUs as they were under pressure from Advanced
Micro Devices."