There are a lot of possible reasons for dumping Video BIOS :
1) Mod it to improve the performance of GPU
2) Use it together with coreboot open source BIOS
3) Just the backup purposes
I already know how it could be done with Windows - not trivial but doable, see the last post at
However I wanted to do it at open source OS such as Linux or Haiku.
Haiku OS is different to Linux, so it may work where the Linux is failing!
If you know any way of dumping Video BIOS at Haiku, please tell us