Date: Wed, 8 Oct 2014 14:43:28 -0300 From: Luiz Otavio O Souza <lists.br@gmail.com> To: Luiz Otavio O Souza <lists.br@gmail.com>, ticso@cicely.de, AN <andy@neu.net>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: FreeBSD on BeagleBone Black Message-ID: <CAB=2f8x6LiC0ZXre4jjmbH=UyA-pqukfYnU_ikji3vBRM_LkiQ@mail.gmail.com> In-Reply-To: <20141008053451.GV1852@funkthat.com> References: <alpine.BSF.2.11.1410071517050.940@mail.neu.net> <20141008010436.GA12125@cicely7.cicely.de> <20141008030621.GU1852@funkthat.com> <CAB=2f8zzre5%2BoPFr8G6gOefS6-dghgTMHfMnEMWNP-pyNVUZsA@mail.gmail.com> <20141008053451.GV1852@funkthat.com>
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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
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