Interested in BSP's (No idea where to start?)

[Joel Sherrill]

On Tue, Nov 26, 2019 at 5:42 AM Niteesh <gsnb.gn at gmail.com> wrote:

> Hii, everyone
> I am interested in contributing to RTEMS, specifically to the arm based
> BSP's. I am a sophomore in electronics and communication engineering
> interested in operating systems, and systems programming. I have written
> small drivers and libraries for Arduino, bare metal avr chips to interface
> with sensors. I would like to take it a bit further by learning about
> ARM-based devices.
>
> I have completed the hello world task for GSOC. As I said early I am
> interested in contributing to the drivers and BSP section for most likely
> raspberry pi and beaglebone. But I have no idea how to proceed further, any
> suggestions on where to start and is it okay to ask tons of questions?
> because I had a look at the previous year's project ideas and very little
> made sense to me. I am ready to put in my best effort just need some
> guidance from your side.
>

This is a hard question to answer. There is a balance of something
interesting to do with not sending you on a quest. One extreme would be a
full BSP from scratch for some expensive hardware that you don't have and
shouldn't even try to afford. The other extreme is something so simple that
it isn't interesting. At the same time, it should be useful to the
community.

I thought a little while about this and think updating the raspberrypi BSP
to support the pi3/pi4 should be a useful and tractable BSP issue to
address. It is also useful to the community.

Discussions when this was brought up before indicate that the precise
System on Chip model changed from the 2 to the 3/4 and at least the base
address of the UART for the console changed. Getting it working should be a
combination of detective work to figure out what precisely changed and fix
it along with the possibility of the need for a different device driver on
the 3/4.

FWIW I noticed that the RSB package qemu4 includes a simulator for the pi2
although I haven't had a chance to see if it works with RTEMS. If it does,
that eliminates absolutely needing pi2 hardware.

Anyway, that's just one idea. It would be useful.

Thanks.

--joel
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