In text mode, only one display can be enabled.
Can this enabled display port be DDI1 or DDI2? I just extracted VBIOS from BIOS provided on board. I assume the display ports are enabled based on the board settings. Can I just set register "gpu_panel_port_select" = "2" to enable DDI1? Thanks. Zheng ________________________________ From: Nico Huber <[email protected]> Sent: Monday, August 7, 2017 9:32 AM To: Zheng Bao; [email protected] Subject: Re: [coreboot] [Broadwell-U]How the eDP, DDI1, DDI2 are enabled? On 06.08.2017 05:18, Zheng Bao wrote: > At which stage do you want to enables these ports? in the OS? or during > boot? if the latter, which payload do you use? > > > Zheng: I want to enable these display port during boot. The payload is > SeaBIOS. You have to set your VGA BIOS to a VESA mode AFAIK. In text mode, only one display can be enabled. Though, I don't know how to do that with SeaBIOS. There might be a compile time option? There are also many options inside Intel's VGA BIOS in a structure called Video BIOS Table (VBT). IIRC, you can set it to start in VESA mode with multiple displays there. There's also an open-source solution for Intel gfx bringup, libgfxinit. Alas, it's not ready to use on Broadwell (it works generally just some steps are missing to make it work with coreboot). Nico
-- coreboot mailing list: [email protected] https://mail.coreboot.org/mailman/listinfo/coreboot
