As usual, renaming the ROM dump accdg. to nomenclature (either 'venid_devid.rom' or 'venid_devid_subsys.rom', or via duplicate both, copying into /Extra and enabling ATIBios in the boot plist did not have any effect, regardless of GE on/off, and/or ATIConfigs, and/or different boot loaders incl. Chimera latest 1.8.1 ...
So then I again stumbled across Kabyl's topic ATI Radeon HD6000, HD5000 and HD4000 series support in Chameleon and these contributions from PGHammer and atka, clarifying that the HD5450s (all variants) FB personalities got purposely nulled by the Chameleon team in ati.c, because the GPUs in the HD5450s are actually mobile GPUs with the BIOS from the HD4890 non-mobile. Enabling framebuffers for the HD5450s would have added confusion for these other two GPU branches the HD5450s are based on. For Snow Leo there is specific boots which inject correct FBs for some variants of the HD5450. These boots do unfortunately not work for Lion. For both, Snow and Lion, there is the ATI5000Injector which again adds correct FBs for a few more of the HD5450s. Since there does not yet seem to be a dedicated boot for my specific card's GPU (codename 'Park'), I'd either have to drill down bcc9's instructions incl. hex editing (which might have to be repeated after an OS X update = not a good idea), or get a recent Lion-capable boot w. FB selection for my HD5450 enabled, so I can change it via ATIConfig.
I know who to contact. Should be solvable



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