Re: HEADLESS flag in ACPI

["Zeng, Star" <star.zeng@intel.com>]

There should be platform has terminal console by serial, but has no VIDEO.


Thanks,
Star
-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Leif Lindholm
Sent: Thursday, September 14, 2017 5:21 PM
To: Evan Lloyd <Evan.Lloyd@arm.com>
Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>; Dong, Eric <eric.dong@intel.com>; Ard Biesheuvel <ard.biesheuvel@linaro.org>; Marc Zyngier <Marc.Zyngier@arm.com>; Catalin Marinas <Catalin.Marinas@arm.com>; edk2-devel (edk2-devel@lists.01.org) <edk2-devel@lists.01.org>; linaro-acpi@lists.linaro.org; Stephanie Hughes-Fitt <Stephanie.Hughes-Fitt@arm.com>; Sudeep Holla <Sudeep.Holla@arm.com>; Dong Wei <Dong.Wei@arm.com>; Zeng, Star <star.zeng@intel.com>
Subject: Re: [edk2] HEADLESS flag in ACPI

+ MdeModulePkg maintainers (GOP), linaro-acpi, Graeme, Ard.

On Wed, Sep 13, 2017 at 12:23:01PM +0000, Evan Lloyd wrote:
> We have a minor conundrum, and would like an element of consensus 
> before we make a commit.
> We want to (re-)submit patches adding HDLCD/GOP for some ARM 
> platforms.
> We have previously been asked to make this optional, as some people do 
> not want the overhead of GOP (and the frame buffer) in their 
> image/RAM.  This is fine, and a build flag called HEADLESS would seem 
> to fit the bill.
> 
> The query arises from the ACPI spec which has (in FADT): "
> HEADLESS 1 12 System Type Attribute. If set indicates the system 
> cannot detect the monitor or keyboard / mouse devices."
> 
> And what we need to confirm is that there is no case of a system with 
> no display still wanting to have keyboard and/or mouse.  I can't 
> imagine there is, but thought it best to check.
>
> Any thoughts?

I can't think of any.

Even if your video is only accessible via BMC, that's still video.

/
    Leif
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