[PATCH rtems 6/6] bsps/imxrt: Add imxrt1166_cm7_saltshaker BSP

[Joel Sherrill]

On Fri, Jul 14, 2023 at 2:09 AM Christian MAUDERER <
christian.mauderer at embedded-brains.de> wrote:

> Hello Jacob,
>
> On 2023-07-14 08:36, Christian MAUDERER wrote:
> > Hello Jacob,
> >
> > On 2023-07-13 18:59, Jacob Killelea wrote:
> >> Hi Christian,
> >>
> >> This looks awesome! Do you have any interest in adding support for the
> >> i.MXRT1062 based Teensy 4.0 and Teensy 4.1?
> >>
> >> - Jacob
> >
> > the Teensy look like interesting boards. Maybe a bit low on memory. That
> > would make it difficult to run libbsd on them. The boards don't have
> > network, so it's not a problem for the network part. But on the i.MXRT,
> > I also use the MMC/SD stack from libbsd so the SD card would be a
> problem.
> >
>
> Just noted: The Teensy 4.1 has an optional Ethernet. So some network
> library would be good. But like I said: The target has too few memory
> for libbsd. lwIP would be a candidate. But I haven't tried that on the
> i.MXRT yet.
>

The specs say  1984K Flash, 1024K RAM which means it will be quite
close with lwip for a RAM-based run. Kinsey did some lwip size estimates
based on a Beagle build but AFAIK no one has tried to squeeze it hard.

Probably running from flash would not be a huge challenge with lwip. Much
more RAM left to play with.

--joel


> Best regards
>
> Christian
>
> > On the Teensy 4.1, the two memories (optional Flash and optional PSRAM)
> > on the FlexSPI maybe can be a bit tricky.
> >
> > These boards would be pure hobby time. I don't think that I will find
> > enough time to fully support the boards at the moment. But I would
> > expect that the basics should work with the i.MXRT1052 BSP already. The
> > 1050 and 1060 family is quite similar. If you want, I can give you some
> > guidance what would be necessary to support the boards.
> >
> > Best regards
> >
> > Christian
>
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