Here's a pdf giving a decent overview:
https://www.bsdcan.org/2006/papers/freebsd.device.driver.slides.pdf

But, the FreeBSD handbook also goes over the process as well.

https://www.freebsd.org/doc/en_US.ISO8859-1/books/arch-handbook/driverbasics.html

For the guy that took Linux drivers, you might want to look into the Linux
Emulator, that would be the easiest path especially if those Linux drivers
includes a lot of Linux specific headers.

The NetBSD drivers should be a bit easier to port.

Best,
Owen

On Sat, Sep 2, 2017, 05:25 Thomas Mueller <mueller6...@twc.com> wrote:

> from Tecno Linux:
>
> > Hello, I have the source code of my wireless driver i extract it from the
> > linux kernel how can i compile that source code or i have another option
> my
> > wireless driver is a realtek rtl8723be wifi
>
> I have similar question, but the source code is from NetBSD and the
> wireless chip is Atheros AR9271.
>
> I also have similar question regarding Ethernet Realtek 8111E re driver,
> works in NetBSD but not FreeBSD (11.1-STABLE and HEAD) on computer in
> question.
>
> Is there online handbook/documentation on writing device drivers or
> porting from Linux or NetBSD?
>
> Tom
>
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