Originally posted by Peter Fodrek
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The video BIOS will initialize the GPU to the point where it can operate a screen with no acceleration, these blobs are to enable additional stuff on top of that.
It's not like CPU microcodes where you either use those from the CPU's ROM, or the ones from the board firmware, or the ones loaded by the OS, but you can't run the CPU at all if there is no microcode at all (a bit hard has the CPU has its own ROM with microcode, which just reiterates how critical microcode is). The GPU reaches a basic "working" state even without these blobs.
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