Date: Wed, 17 Feb 2016 13:09:59 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: Warner Losh <imp@bsdimp.com> Cc: ticso@cicely.de, Kevin Lo <kevlo@freebsd.org>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, Emmanuel Vadot <manu@bidouilliste.com> Subject: Re: FreeBSD on the $9 C.H.I.P Message-ID: <20160217120959.GA96435@cicely7.cicely.de> In-Reply-To: <CANCZdfp4kDtmDdOz=FQzOsBZaAqcipQ_z77zyQe9Bo_1M5-GJg@mail.gmail.com> References: <56BBD0B0.7040407@thieprojects.ch> <56BBD6B9.3090703@interia.eu> <20160211104534.5c18d1d32b3b55fdc458f6a5@bidouilliste.com> <56BCD629.3040209@interia.eu> <20160215123438.GK75922@cicely7.cicely.de> <20160215150404.GA51274@ns.kevlo.org> <20160215162419.GL75922@cicely7.cicely.de> <CANCZdfp4kDtmDdOz=FQzOsBZaAqcipQ_z77zyQe9Bo_1M5-GJg@mail.gmail.com>
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On Tue, Feb 16, 2016 at 11:33:08AM -0700, Warner Losh wrote: > On Mon, Feb 15, 2016 at 9:24 AM, Bernd Walter <ticso@cicely7.cicely.de> > wrote: > > > On Mon, Feb 15, 2016 at 11:04:04PM +0800, Kevin Lo wrote: > > > On Mon, Feb 15, 2016 at 01:34:39PM +0100, Bernd Walter wrote: > > > > On Thu, Feb 11, 2016 at 07:42:49PM +0100, Kris wrote: > > > > > Yep, that's what I meant. As long as we distinguish Allwinner naming > > > > > convention from what is inside we shall be fine (although Allwinner > > > > > tries hard to confuse people... as if ARM had not done enough :) ) > > > > > That being said I think support for Allwinner chips is worth being > > > > > continued. They are cheap, quite robust, quite popular, and > > > > > documentation is reasonably available (credits go to sunxi I must > > admit) > > > > > > > > This is the first time I hear someone saying that documentation for > > > > Allwinner is available. > > > > Any links to share or is this still under some kind of NDA? > > > > > > Some datasheets are available at > > https://github.com/allwinner-zh/documents > > > > Oh - there are register definitions for the A20 I'd looked up. > > That's better than nothing at least. > > So far all I'd seen where block diagrams and pinouts. > > > > Yea, but many of the interesting bits, like the NAND controller, are > too light in detail to actually implement a NAND controller driver. Same for the grafic part. I have no clear idea how the framebuffer data goes through all the layers until it goes out to an LCD or HDMI port. And trying reverse engineering any Linux source won't comply with ENOTIME that most of us have to deal with. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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