Hi, I wanted to ask if there is a way to read the GPU ROM from my mid-2014 rMBP from within the OS. I am trying to enable VGA passthrough on it using KVM-QEMU, and I am needing to pass a ROM file to the QEMU command line parameters. I have documented my progress on the Arch Linux forums here: https://bbs.archlinux.org/viewtopic.php?id=197361.
Things I have tried so far to read the GPU ROM: 1. From Arch, `echo 1 > <path-to-pci-device>/rom && cat <path-to-pci-device>/rom` => results in an I/O error. 2. Installed Windows 8.1 on an external harddrive, booted from it, installed GPU-Z, and tried saving the ROM file from GPU-Z => results in "reading from BIOS not supported". 3. Tried using flashrom with the gfxnvidia switch => not supported. 4. Tried looking around in efivars, and found two files with "ROM" in the name => issuing cat <filename> outputs binary values that cannot be parsed by the rom-parser from here: http://vfio.blogspot.com/2014/08/does-my-graphics-card-rom-support-efi.html. I hope this is a good place to ask, because I am running out of places to ask for help :(. Thanks for any hints! Ryan
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