? about kernel size..

[Warner Losh]

On Tue, Mar 8, 2016 at 10:42 AM, Brad Walker <bwalker at musings.com> wrote:

> I'm looking at working on a new project that will use the FreeBSD kernel. I
> would attempt to embed the kernel on a very small NXP Kinetis chip. I've
> previously done this using a Linux kernel but also had DDR memory attached
> to the chip. This project would not have a DDR chip attached.
>
> So a couple of questions. 1 - What is the smallest size I could configure
> the FreeBSD kernel out of the box? Could I get the size to be less than
> 10MB, 5MB, 2MB, or etc.?
>

I've managed to get this down to about 2MB or a bit smaller. Compressed
this can be a little smaller. It takes a fair amount of work, but it can be
done.


> I did a little bit of research on the PicoBSD and NanoBSD but that still
> seem to be targeted to a little bit bigger chip than I have available.
>

How big a chip do you have? NanoBSD currently needs at least
64MB (and ideally 128MB) of storage. PicoBSD can be a bit smaller.

Warner


> Thanks for any insight/help. Also, if you response, please include me on
> the CC line as I'm not a member of the freebsd-embedded alias.
>