Hello. Thank you for this wonderful tool! I ran it today on the vBIOS I pulled from my Sapphire R7 270X, and when I pass the romfile it created to my Windows VM everything boots perfectly using gpu-passthrough.

When I pass it to my Mac VM in the same manner, I can get farther than I could without it: I can get a bunch of framebuffer boot text to spit out. However at some point the screen goes black - I take it when it is time to do video-y things. I am wondering if this is because the vBIOS that is actually installed on the card is still legacy-only.

I am thinking I should try to flash the rom created by the tool provided here onto my 270X. However, one thing is giving me pause: the created file is a little bit smaller than the original (122k vs. 128k). I am pretty sure this is because the script deletes a bunch of filler data at the end of the bios so as to not risk going over 128k, which presumably happens in some cases.

My question is: is the fact that the new vBIOS is a bit smaller a huge red flag, or no big deal? I have never flashed a vBIOS before, let alone a modded one like this, so I just want to make sure I am not making a dumb mistake.

Interesting side note, I learned by skimming this thread that my vBIOS apparently already comes with an EFI image, but it is 'turned off' so-to-speak, and to get it to work you technically only need to change a couple of hex characters.

Thanks again!