[PATCH] Add framebuffer in BBB

[Vijay Kumar Banerjee]

On Sun, Jul 28, 2019 at 1:31 PM Christian Mauderer <list at c-mauderer.de>
wrote:

> On 27/07/2019 21:43, Vijay Kumar Banerjee wrote:
> >
> >
> >
> > On Sat, Jul 27, 2019 at 7:37 PM Christian Mauderer <list at c-mauderer.de
> > <mailto:list at c-mauderer.de>> wrote:
> >
> >     On 26/07/2019 13:41, Christian Mauderer wrote:
> >     > On 26/07/2019 13:22, Vijay Kumar Banerjee wrote:
> >     >> Hello everyone!
> >     >>
> >     >> I'm excited to post the following patchset. With this patchset
> >     >> I have the framebuffer working in BBB and have tested it with a
> >     >> BBB revC with HDMI connected Screen.
> >     >>
> >     >> This patchset uses mmap and hence it's necessary to apply the
> >     >> patche ON TOP OF mmap patch to avoid merge conflict.
> >     >>
> >     >> In reply to this mail, I'll be attaching a picture of the screen
> >     >> where my rectangle drawing application made a nice red rectangle
> >     >> on the screen just like in FreeBSD.
> >     >>
> >     >> Thanks and regards,
> >     >> Vijay
> >     >>
> >     >
> >     > Hello Vijay,
> >     >
> >     > it's great that you now have a working driver. Well done.
> >     >
> >     > I hadn't had a look at most patches yet and most likely that will
> >     need a
> >     > bit of time. It's a lot of stuff. Most likely the bigger patches
> won't
> >     > reach the mailing list so maybe adding a link to a branch on your
> >     github
> >     > repo would be good.
> >     >
> >     > Note: Please don't send a v2 right now. I'm sure there are more
> >     comments
> >     > (maybe not only from me). Collect comments for at least one or two
> >     days
> >     > and create an update afterwards.
> >     >
> >     > Some notes reading the patch overview:
> >     >
> >     >> [PATCH 01/10] TDA19988 : Import from FreeBSD
> >     >> [PATCH 02/10] TDA19988 : port to RTEMS
> >     >> [PATCH 03/10] am335x display drivers: Import from FreeBSD
> >     >> [PATCH 04/10] am335x display drivers : Port to RTEMS
> >     >> [PATCH 05/10] fbd : Import from FreeBSD
> >     >> [PATCH 06/10] fbd : Port to RTEMS
> >     >
> >     > Is fbd a prerequisite of am335x_lcd? In that case it would have
> been
> >     > better to reorder the patches. As long as every version compiles
> (to
> >     > allow git bisect) I would accept that order too. But as a general
> rule
> >     > prerequisites should be prior to the parts that use it.
> >     >
> >     >> [PATCH 07/10] VT : Import from FreeBSD
> >     >> [PATCH 08/10] VT : Port to RTEMS
> >     >
> >     > Is the vt still necessary? I think it was an intermediate step to
> try
> >     > whether it's initializing the display. Did you try without it?
> >     >
> >     >> [PATCH 09/10] TI Pinmux : Import from FreeBSD
> >     >> [PATCH 10/10] TI Pinmux : Port to RTEMS
> >     >
> >     > Again: prerequisite. So they should be one of the first.
> >     >
> >     > Best regards
> >     >
> >     > Christian
> >     >
> >
> >     One general question: When trying the patches, my monitor has been
> set
> >     up as 1440x900 instead of it's native resolution. Did you check
> whether
> >     the resolution on your screen is set correctly?
> >
> > It's not setting fb with the "preferred videomode", I can confirm that
> > the resolution
> > set by FreeBSD and RTEMS is same.
>
> OK. Sooner or later it might would be good to find out how to set
> another resolution. Currently I have the following output:
>
> ````
> Preferred mode: 1920x1200 @ 60Hz
> Number of extension blocks: 1
> fb0: detected videomode: 1440x900 @ 60KHz
> fbd0 on fb0
> ````
>
> It's a bit odd that not the preferred mode is used. But if it is the
> same for FreeBSD it's OK for a start.
>
> One other problem: I tried to create some solid regions and it seems
> that there are a few artefacts. Can you try that on your screen and tell
> me whether you get them too? For the code and an image how it looks like
> on my screen take a look at
>     https://gist.github.com/c-mauderer/051689bb1199caf20a08d9844c44c113
>
> Some of the lines vanished after a few seconds. I think that could be a
> memory caching issue.
>
> I see the same. Some lines come back after a few seconds:
https://drive.google.com/file/d/1CA61bs0nipUygRpotmyL-Hd8khG_RIbD/view?usp=sharing


> >
> >     Best regards
> >
> >     Christian
> >
>
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