From owner-freebsd-arm@FreeBSD.ORG Wed Oct 8 17:43:31 2014 Return-Path: Delivered-To: freebsd-arm@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 4D1B7252 for ; Wed, 8 Oct 2014 17:43:31 +0000 (UTC) Received: from mail-la0-x22d.google.com (mail-la0-x22d.google.com [IPv6:2a00:1450:4010:c03::22d]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id C7284140 for ; Wed, 8 Oct 2014 17:43:30 +0000 (UTC) Received: by mail-la0-f45.google.com with SMTP id q1so8988232lam.32 for ; Wed, 08 Oct 2014 10:43:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=zmdkQcwXxbGLKmeWI7bC710DyfpoMyV1VJrfXryyCFw=; b=cRmiWGxLJiHt3TwPAnth9Cb4606cUwoy3URfOyH5FCQfw7+V6KMsPLizcjKn3hzmbK iF5NoSTVdH39tmaG1X9awo8X+cWiKuqrPbIy6/84RdgBrFZcvAOiOtCYbhro7IFHWRQM By+QwC8Oc8/Z76C1YCNMq+OgKp8qpW6Vsd8GeKDULiHG4yLSISEmJlZ4AYXcK4KIs/ig IeC6OrAh2GfkWg9pPcneuv4QLLZCTf2qyD++P4QOAJ3d/RX6xnztIQxREHcvF6YBXSFz TmnIW3KUaEPZJaupy8gk7lGPfOfx4glXLxow/LNxEVV/cdONQd59HFWTZZDPPH0CKE/B /ouA== MIME-Version: 1.0 X-Received: by 10.152.5.40 with SMTP id p8mr13231083lap.32.1412790208664; Wed, 08 Oct 2014 10:43:28 -0700 (PDT) Received: by 10.112.126.39 with HTTP; Wed, 8 Oct 2014 10:43:28 -0700 (PDT) In-Reply-To: <20141008053451.GV1852@funkthat.com> References: <20141008010436.GA12125@cicely7.cicely.de> <20141008030621.GU1852@funkthat.com> <20141008053451.GV1852@funkthat.com> Date: Wed, 8 Oct 2014 14:43:28 -0300 Message-ID: Subject: Re: FreeBSD on BeagleBone Black From: Luiz Otavio O Souza To: Luiz Otavio O Souza , ticso@cicely.de, AN , "freebsd-arm@freebsd.org" Content-Type: text/plain; charset=UTF-8 X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 08 Oct 2014 17:43:31 -0000 On 8 October 2014 02:34, John-Mark Gurney wrote: > Luiz Otavio O Souza wrote this message on Wed, Oct 08, 2014 at 01:07 -0300: > [...] >> I also see some GPIO pins on schematics (like GPIO0_19 and GPIO1_27 on >> page 3) which may need to be set for the HDMI support and i did not >> check the gonzo's code to verify if they are properly set. > > Yeh, GPIO1_27 is the one that enables the clock to the HDMI chip and > when I was looking over his patch, I didn't see anything for enabling > it... This is mentioned in the SRM... > > Looks like GPIO0_19 isn't necessary as that is the clock for CEC, > and we don't need that till later (say use the TV remote as an input > device)... Well, you'll find that the BBB documentation is... confusing... GPIO1_27 enable the 24.576MHz clock used on McASP (multichannel audio serial port). This clock is connected back to GPIO3_21 (McASP clock input). It can be disabled to allow the use of GPIO3_21, to reduce the power drain or to allow an external McASP clock. GPIO0_19 enable the 12MHz clock which is actually used by TDA19988. I hope it make sense. /me looking forward for the HDMI support (and then, audio ?!? :) Luiz