i have made some progress.
fresh install +cpu patch
clover 4769
replaced fakesmc with virtualsmc
and auto login ON
successfull boot to desktop but its laggy and second monitor is still pink
currently googling patch vbios
update: different imac sysdef i have tried 14.2 - 17.1 - 18.1 - 18.3 - all black screen
only on macpro6 i have boot to desktop
in text below "Radeon" framebuffer is injected. just testing. it boots without injecting framebuffer
kiks-Mac-Pro:~ kik$ ioreg | grep ATY | | | | +-o ATY,AMD,RadeonFramebuffer@0 | | | | +-o ATY,AMD,RadeonFramebuffer@1 | | | | +-o ATY,AMD,RadeonFramebuffer@2 kiks-Mac-Pro:~ kik$ ioreg | grep AMD | | | | +-o AMD9500ControllerWrangler | | | | +-o AMDSupport | | | | +-o AMDRadeonX4000_AMDRadeonHWServicesPolaris | | | | | +-o AMDRadeonX4000_AMDRadeonHWLibs | | | | +-o AMD9500Controller | | | | +-o ATY,AMD,RadeonFramebuffer@0 | | | | | +-o AMDFramebufferVIB | | | | +-o ATY,AMD,RadeonFramebuffer@1 | | | | | +-o AMDFramebufferVIB | | | | +-o ATY,AMD,RadeonFramebuffer@2 | | | | | +-o AMDFramebufferVIB kiks-Mac-Pro:~ kik$ /code]