Configuring FireMV 2400

[Bill Conner]

  I've been fighting with get a ATI FireMV 2400 PCIE for several days now and I've reached a dead end. I was hoping someone has already resolved my issue or can point me in the right direction.

Environment details
Ubuntu 9.10
2.6.31-18-generic
xorg-server 2:1.6.4-2ubuntu4.1

The 2400 is a quad-head board with two M24 chips appearing on separate PCI slots. In my case 0:5:0:0(primary) and 0:6:0:0
The server has no issue in auto detect mode with the primary M24 and it's dual heads perfectly. The problem is getting the server to recognize the second M24. It sees the card but it fails to load:

There is an old bug report here that hits on the exact problem for the older card with the M9 chip. The BIOS detection code is unable to detect the BIOS on the second chip. A workaround is given to supply the BiosLocation but that appears to be no longer supported. I've tried the BiosBase option with the same location but that appeared to have no effect.
https://bugs.freedesktop.org/show_bug.cgi?id=7358

Here are snippets for the to cards loading. TOTO is unable to determine the MMIO on the second chip

(II) RADEON(0): Built from git commit 7968e1fb89f6b59d1654df48249bf4b81990c008
(II) RADEON(0): TOTO SAYS 00000000df9e0000
(II) RADEON(0): MMIO registers at 0x00000000df9e0000: size 64KB
(II) RADEON(0): PCI bus 5 card 0 func 0

(II) RADEON(1): Built from git commit 7968e1fb89f6b59d1654df48249bf4b81990c008
(II) RADEON(1): TOTO SAYS 0000000000000000
(EE) RADEON(1): No valid MMIO address

Thanks,

-Bill