README

VBT is also documented by intel-gpu-tools:
https://cgit.freedesktop.org/xorg/app/intel-gpu-tools/tree/tools/

There's intel_vbt_decode (former intel_bios_decode) available intel_vbt_decode.c that will print all tables in human readable form:
https://cgit.freedesktop.org/xorg/app/intel-gpu-tools/tree/tools/intel_vbt_decode.c

Here is the self-sufficient context in one single directory (done on Fedora 25 latest upgrades - author himself tested the tool in given context below), extracted from the following web site:

[user@localhost intel-gpu-tools]$ gcc intel_vbt_decode.c intel_device_info.c -o vbt
[user@localhost intel-gpu-tools]$ ls -al
total 352
drwxrwxr-x. 2 user user   4096 Apr  8 07:33 .
drwxrwxr-x. 4 user user   4096 Apr  8 07:32 ..
-rw-rw-r--. 1 user user   4123 Apr  6 20:18 drmtest.h
-rw-rw-r--. 1 user user  12889 Apr  6 21:07 i915_pciids.h
-rw-rw-r--. 1 user user  27736 Apr  6 20:46 igt_core.h
-rw-rw-r--. 1 user user   9816 Apr  6 20:44 intel_batchbuffer.h
-rw-rw-r--. 1 user user  28814 Apr  6 20:03 intel_bios.h
-rw-rw-r--. 1 user user   6236 Apr  6 20:15 intel_chipset.h
-rw-rw-r--. 1 user user   6796 Apr  6 21:05 intel_device_info.c
-rw-rw-r--. 1 user user   3310 Apr  6 20:14 intel_io.h
-rw-rw-r--. 1 user user 116344 Apr  6 20:47 intel_reg.h
-rw-rw-r--. 1 user user  54812 Apr  6 19:58 intel_vbt_decode.c
-rwxrwxr-x. 1 user user  54928 Apr  8 07:33 vbt
[user@localhost intel-gpu-tools]$

WARNING: Please, do note that additional packages might be requested due to missing DRM definition files?! For me to make this package work on the bare F25 notebook, I needed to do few package installations, and few /usr/include .h files copying, since these files were expected to be on other/adjacent directories.

I needed to install the following packages on Fedora distro to make VBT parser to compile into human readable format:
[1] libpciaccess-devel : PCI access library development package, Repo: fedora
[2] libdrm-devel       : Direct Rendering Manager development package, Repo: fedora

Then, as already noted, I copied some files to adjacent directories, as shown below:

[user@localhost include]$ su -m
Password:
[root@localhost include]# pwd
/usr/include
[root@localhost include]# cp drm/drm.h .
[root@localhost include]# cp drm/drm_mode.h .

With this Human Readable Interface dumper the following should be possible:
[1] Make a "decompiler" that would convert VBT from the option ROM into a human/machine readable text format;
[2] Make a "compiler" that would take that text format and create a binary VBT from it;
[3] Put the binary VBT into the ACPI IGD OpRegion table (or wherever the graphics driver can find it).