Beagleboard BSP Framebuffer

Tue Mar 12 10:35:39 UTC 2019

On Tue, 12 Mar 2019 at 15:27, Christian Mauderer <
christian.mauderer at embedded-brains.de> wrote:

> Am 12.03.19 um 10:52 schrieb Vijay Kumar Banerjee:
> >
> >
> > On Mon, 11 Mar 2019 at 19:21, Gedare Bloom <gedare at rtems.org
> > <mailto:gedare at rtems.org>> wrote:
> >
> >
> >
> >     On Sun, Mar 10, 2019 at 7:31 PM Joel Sherrill <joel at rtems.org
> >     <mailto:joel at rtems.org>> wrote:
> >
> >         The MINIX license is BSD with advertising clause as I read it.
> >         That is less preferable to a 2-paragraph BSD license that you
> >         are likely to find in Freebase. Try there.
> >
> >     The license is fine if you find nothing else. I assume Joel meant
> >     FreeBSD.
> >
> >     Study the framebuffers in i386 and raspberrypi code bases.
> >
> >
> > Hello,
> >
> > Thanks for the reference, I found the tda19988 driver in freebsd source.
> > Following the raspberrypi framebuffer, I have made a header file with
> the
> > basic functions to implement. The implementation will be using the
> > driver code from the freebsd.
> >
> > What needs to be figured out next is how to use the driver code with
> rtems,
> > since the file uses a lot of header files from the freebsd source, how
> do we
> > go about integrating it with rtems? Is there any guide on using codes
> from
> > different projects into RTEMS?
> >
> >
>
> Hello Vijay,
>
> for FreeBSD we have the libbsd as an easy way to integrate sources and
> keep them up to date. Although I don't think that we have a framebuffer
> driver there yet I would expect that it is a good method for that too.
>
> Best regards
>
> Christian
>
> Hi

I cloned the rtems-libbsd and the framer driver is not there. I wonder if
adding
this drivers to libbsd is itself a meaty task. Do we need a ticket for this
?

Also, the driver uses i2c bus driver from FreeBSD source, I see that the
i2c driver
is nicely supported in the rtems beagle bsp, how to use the i2c module in
the bsp,
with the hdmi framer driver in libbsd ? (I'm a bit confused here :) )

> >
> >
> >         It is usable in RTEMS though. We just try to avoid pushing the
> >         advertising requirement
> >
> >
> >
> >         On Sun, Mar 10, 2019, 12:47 PM Vijay Kumar Banerjee
> >         <vijaykumar9597 at gmail.com <mailto:vijaykumar9597 at gmail.com>>
> wrote:
> >
> >
> >
> >             On Fri, Mar 8, 2019, 12:35 AM Vijay Kumar Banerjee
> >             <vijaykumar9597 at gmail.com <mailto:vijaykumar9597 at gmail.com>>
> >             wrote:
> >
> >                 Hi,
> >
> >                 I was reading up and trying to figure out the steps to
> >                 achieve this project. Here's
> >                 what I came up with :
> >
> >                 1. BBB uses TD19988 HDMI Framer, so the first step is to
> >                 get an HDMI output,
> >                 read EDID info and set the videomode according to the
> >                 info. After some searching,
> >                 I found a driver in minix that might be helpful. Is the
> >                 minix license compatible?
> >                 (
> https://github.com/Stichting-MINIX-Research-Foundation/minix/blob/03ac74ede908465cc64c671bbd209e761dc765dc/LICENSE
> )
> >
> >                 2. Set the values of structs from fb.h
> >                 3. Write the fb.c using the functions from framebuffer.h
> >                 ( I'm taking the fb.c in raspberrypi
> >                 as example and the bsp-howto as a reference text)
> >
> >                 The above list is just an outline and I intend to
> >                 explore/understand it better and make a
> >                 proposal out of it.
> >
> >                 Does this list make sense to you?
> >
> >                 What am I missing?
> >
> >                 I would really appreciate any remarks/comments or
> >                 details you'd like to add, it will help me understand it
> >                 better.
> >
> >             ping :)
> >
> >
> >                 Thanks,
> >                 --vijay
> >
> >         _______________________________________________
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> >         devel at rtems.org <mailto:devel at rtems.org>
> >         http://lists.rtems.org/mailman/listinfo/devel
> >
>
> --
> --------------------------------------------
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