You can add a devctl call to the driver so that an external program can
read/write the switch registers. Here is a programming guide for io-pkt
drivers.

http://community.qnx.com/sf/sfmain/do/downloadAttachment/projects.networkin
g/discussion.drivers.topc20933/post89118;jsessionid=8628BFDB82FF9A97611B177
AAA18FDA4?id=atch11180




On 2014/8/15, 10:10 AM, "Derek Ross" <community-noreply@qnx.com> wrote:

>Hello,
>This is more of a "broad brushstroke" question, mainly due to my lack of
>QNX knowledge. 
>
>Our hardware has a 88E6176 switch attached on the MII bus. We would like
>to give the user the ability to set the various registers over a local
>socket. It would be a low level interface, i.e. "set this register to
>this value."
>
>So here are some basic questions:
>
>- Can I simply call mmap_device_memory to write to the device? Probably
>not, because the existing ethernet driver will be writing stuff to the
>MII bus.
>
>- Which category would this driver belong in? It's not really an io-pkt
>driver.
>
>- Is there already a device driver for something similar, with associated
>source code?
>
>- Is there a PDF describing how to write device drivers? I found one
>called "QNX  Momentics  DDK - Network Devices" but it's for Neutrino 6.3.
>Also the MII_ functions it describes don't seem to be supported in
>Neutrino 6.5 SP1. For example, a help file search for
>MII_Register_Extended returns no results (Momentics version is 4.7).
>
>Thanks!
>
>
>
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