July 22, 2009
I just succesfully created efi rom for 4890.
efi part based on patched 4870 efi rom.
bios part is from msi 4890
since most 4890 based on original amd design, the rom should work with most 4890
edit clocks to the one u have(by default its 880mhz for core) with “Radeon bios editor”
you can make a donation too here
The rom image – link to rom image
You can use this flashing instruction – http://netkas.org/?p=90 .
p.s. rom for 4870×2 is coming soon (for working 1 core)
p.s.s. you will still need patched ATIRadeonX2000.kext from irc to get qe/ci, since apple doenst suport 4890.