BBB Framebuffer driver : Project status

[Vijay Kumar Banerjee]

On Tue, Jun 25, 2019 at 9:32 PM Gedare Bloom <gedare at rtems.org> wrote:

> On Tue, Jun 25, 2019 at 5:34 AM Vijay Kumar Banerjee
> <vijaykumar9597 at gmail.com> wrote:
> >
> > Hello,
> >
> > The First Evaluation is going on and I here I would summarize all the
> progress
> > that the project has made in the first Phase.
> >
> > 1. The major progress is the completion of the I2C adaptation layer in
> the libbsd
> >      along with the iicbus driver imports. The v4 of the driver [1] has
> been tested to be
> >      working with the bbb-i2c driver patch [2]. After the RTEMS driver
> is updated in the
> >      master, the adaptation layer will be mergeable.
> >
> > 2. I am getting EDID reading from the imported tda drivers. I have
> checked this using
> >     the ti_i2c driver but now as we have an updated version  of the
> driver, I'll pull this all
> >     with the adaptation layer and will continue from there.
> >
> > 3. I found a sample app from the freebsd mailing list, that draws a
> basic shape on the
> >     screen. I have made it a standalone app with only single source and
> have tested it
> >      to be working with the FreeBSD. The only issue with the code is
> that it uses mmap
> >      and RTEMS doesn't use mmap so I'm rewriting the app with pread and
> pwrtie on
> >      to write to the /dev/fb0 directly. This app work is ongoing.
> >
> We have a rudimentary mmap() support available. I would expect this
> might be important to investigate for graphics applications in general
> might be trying to mmap() device memory.
>
> At this moment, my objective is to just test that the fb device is working.
For that, as I said, I'm trying to rewrite the mmap with pread instead. So
far I couldn't get anything on screen with it though but if the writes work
then I'm expecting to see something on the screen.
As you have pointed out that most graphics applications will be using
mmap(). Do you suggest trying to improve mmap() support as a part
of this project? Is that expected to take a lot of time?

> Next Up:
> > 1. merge the ported TDA driver and using it with the adaptation layer.
> > 2. Import and port the fbd dirver to create an fb0 device.
> > 3. complete the sample app and convert it into a libbsd sample app to
> test the device.
> >
> > Thanks,
> > Vijay
> >
> > _______________________________________________
> > devel mailing list
> > devel at rtems.org
> > http://lists.rtems.org/mailman/listinfo/devel
>
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