Right now, with a PowerMac G5, the only way to install the graphics driver from the ATI binaries would be to patch the kernel, for my Radeon 9600 is only supported with the 9.3 installer, while the 12.6 has no effect. My current issue is that the new kernel with an old driver is preventing the install. Is there a way to correctly patch this without issues?
My gut feeling is no, because the current (3.2) kernel ABI may not be fully backward-compatible with the binary blobs in the old 9.3 installer. Sorry :(