[PATCH] Add framebuffer in BBB

Christian Mauderer christian.mauderer at embedded-brains.de
Fri Jul 26 11:41:46 UTC 2019

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

embedded brains GmbH
Herr Christian Mauderer
Dornierstr. 4
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email: christian.mauderer at embedded-brains.de
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