From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-x22f.google.com (mail-wm0-x22f.google.com [IPv6:2a00:1450:400c:c09::22f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 88B3A21E8799E for ; Thu, 14 Sep 2017 02:17:37 -0700 (PDT) Received: by mail-wm0-x22f.google.com with SMTP id i189so8648903wmf.1 for ; Thu, 14 Sep 2017 02:20:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=OquhabhwdCKt1429abGi34+lJR8Sq1opnLyuu0q5tQU=; b=GNuUbhd8pYBT+G6VDk318F0o8Q/idHI4U6XWC8YRfGq90hD7lxDkbi+CrdRg1ngXS4 mv4qCePQBS/+9Ho6O7dNNSTJKi9/JUHE+01LO4cZB0KhEYVbH82cmaQwNZddzSWUHb06 YGN6t8PWRP8Yk2Yxc02iijI6Bq3DSwNnmUabY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=OquhabhwdCKt1429abGi34+lJR8Sq1opnLyuu0q5tQU=; b=peOgAYi7/+Wig8ffddXOjk/MKPBZzMWNJCpBlS7VHRj76cok7UZy77Jmu54NPB5Z+J vK1UTgXkdm/84gR31pEkUaVqP7BhzbsQ1AI6U3bdEUJ1mrEtqYGPfay4nSVjvzazbYv8 Atuhhtrhnk8ShmBpONPMam2ijHEZNeAwBxXR2KWGSxU8Oe6Kvrp29tZAUJCT/0QVqEwo 5Z1Tu57211xpLVyfLXniKyHqeJNncW9e1cKBKNzPwhFNT78wl0g0yftqS1fd64ol4Jhm sKtkWS8DPlc0NKP6BXXD5q3s+MLvFtF/i4twtYuBa/5Hgcan2qITSl28RILTayQ2JbO+ yTXg== X-Gm-Message-State: AHPjjUim69M/A9Fk+wvSRo413V5FiceUU4vP53uk1qlJ4wau/FjwJXzM JUjWFW7IsbxGZo3B X-Google-Smtp-Source: AOwi7QCd4anef0SgE96m9ThnzSETy4CKYZgzJwSgewfxBrVGTuaH4hMopisyPw+kpfMRKSvcOpF+Sg== X-Received: by 10.28.154.19 with SMTP id c19mr1459787wme.59.1505380833664; Thu, 14 Sep 2017 02:20:33 -0700 (PDT) Received: from bivouac.eciton.net (bivouac.eciton.net. [2a00:1098:0:86:1000:23:0:2]) by smtp.gmail.com with ESMTPSA id 7sm8709549wrn.13.2017.09.14.02.20.32 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 14 Sep 2017 02:20:32 -0700 (PDT) Date: Thu, 14 Sep 2017 10:20:30 +0100 From: Leif Lindholm To: Evan Lloyd Cc: Ard Biesheuvel , "edk2-devel (edk2-devel@lists.01.org)" , Lorenzo Pieralisi , Sudeep Holla , Catalin Marinas , Marc Zyngier , Matteo Carlini , Stephanie Hughes-Fitt , Dong Wei , Star Zeng , Eric Dong , linaro-acpi@lists.linaro.org, Graeme Gregory Message-ID: <20170914092030.abjnig23phgkp5j6@bivouac.eciton.net> References: MIME-Version: 1.0 In-Reply-To: User-Agent: NeoMutt/20170113 (1.7.2) Subject: Re: HEADLESS flag in ACPI X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Sep 2017 09:17:38 -0000 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline + 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