VBT is documented by intel-gpu-tools. There's intel_vbt_decode (former intel_bios_decode) available https://cgit.freedesktop.org/xorg/app/intel-gpu-tools/tree/tools/intel_vbt_decode.c that will print all tables in human readable form. Regards Patrick
Am 4. April 2017 20:45:15 MESZ schrieb Nico Huber <[email protected]>: >Hi Ron, > >On 04.04.2017 19:46, ron minnich wrote: >> Igor, if you are going to say things like "AFAIK there is no public >> description of these tables' layout and contents, only Intel knows >how to >> build and parse them.", it's really a good idea to back it up with a >> primary source, especially since you also use phrases like "I assume" >and >> "I guess". I am pretty sure you're wrong in this case. The V in VBT, >as I >> understand it, means VESA, and VESA has been a standard for about 30 >years. >> >> Please, everyone, if you're going to move this conversation forward, >you >> need to cite primary sources at least, such as this one: >> http://www.petesqbsite.com/sections/tutorials/tuts/vbe3.pdf. > >now you got confused too. I'll try to clarify. > >VBE means VESA (Video Electronics Standards Association) BIOS >Extension. >It's a Video BIOS interface extension (i.e. specifying additional BIOS >calls). Don't know if it was public from the beginning (you often have >to be a VESA member to get access to their "standards"), but the inter- >face is used by many open source programs. It's vendor independent. >Also >it's off-topic, nobody was discussing it here. > >As Igor noted, VBE has absolutely nothing to do with VBT. > >VBT means Video BIOS Table. It's a 100% Intel specific table of confi- >guration options for Intel's Video BIOS and Intel's graphics drivers. >There is no public documentation, but as it's used by the Linux driver, >at least the structure and some of the values are publicly "documented" >[1]. Developers of the i915 Linux driver stated that they are not wil- >ling to support systems without a VBT. Most features of the i915 driver >work without a VBT by chance. But anything board specific, like inte- >grated panels in laptops, will likely _not_ work. I'd also expect that >they won't count it as a regression if something breaks but would still >work with a VBT. (Windows won't even try to get things running without >VBT, AFAIK.) > >An OEM should have access to Intel's binary configuration tool and the >specification file for the VBT of his processor's generation. It comes >along with the VBIOS, I suppose. > >Nico > >PS. Igor, Zoran please write text-only emails or at least make sure the > text version is readable and quotes are visible as quotes. > >[1] >https://www.kernel.org/doc/html/latest/gpu/i915.html#video-bios-table-vbt > >-- >coreboot mailing list: [email protected] >https://www.coreboot.org/mailman/listinfo/coreboot
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