May be it not best material, but blog of adrian@ is really helpful:
2 сент. 2017 г. 11:11 ДП пользователь "Thomas Mueller" <mueller6...@twc.com>
> > 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-
> > For the guy that took Linux drivers, you might want to look into the
> > Emulator, that would be the easiest path especially if those Linux
> > includes a lot of Linux specific headers.
> > The NetBSD drivers should be a bit easier to port.
> > Best,
> > Owen
> I downloaded it but haven't read yet.
> Actually, it's the arch-handbook, not in the regular FreeBSD handbook.
> Thanks for the leads!
> > I was planning on also porting over the Atheros AR9271 driver from NetBSD
> > (athn(4) /usr/src/sys/dev/usb/if_athn_usb.c), but not until I finish the
> > current device I am working on. It might not be for a while though. There
> > is likely a lot of shared code with ath(4) on FreeBSD
> > (/usr/src/sys/dev/athn). NetBSD seems to separate all code between USB
> > PCI, whereas FreeBSD combines drivers. Let me know if I can help out, as
> > already own this device and would be willing to test out code or
> > troubleshoot with you.
> > I am currently working on another driver from Linux to FreeBSD. The core
> > concepts are the same, but a lot of code is in different order. FreeBSD
> > drivers have an attach function that assign function pointers to the
> > struct. The Linux equivalent is in DRIVERNAME_ops. In my case, this:
> > http://src.illumos.org/source/xref/linux-master/drivers/net/
> > Hope this helps. But yes, would love to work on AR9271!
> What is the rtl8188ee? Maybe I'd recognize the brand and model.
> I have Hiro H50191, which uses rsu driver.
> That last URL looks like something related to Illumos and OpenIndiana.
> My Atheros AR9271 is (quasi-)USB, an inseparable part of the motherboard
> in contrast to the Hiro H50191 which is a USB-stick wireless adapter.
> It has sometimes worked on NetBSD, but more often would fail to load
> On latest NetBSD-current, it stops the kernel from booting unless I
> disable it or comment out in kernel config. GENERIC kernel reboots
> immediately without showing any messages.
> OpenBSD also has AR9271 driver and Realtek re. I have NetBSD
> installations but no OpenBSD.
> I would like, at first, if possible, when I have a driver to build, to
> build the module rather than the whole kernel every time.
> I am familiar with C and C++ but think I need to brush up. Any online
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