GSOC 2017 RTEMS-libbsd issue

[Christian Mauderer]

Am 19.04.2017 um 07:45 schrieb Christian Mauderer:
> Am 18.04.2017 um 17:10 schrieb Sichen Zhao:
>>
>> Hi all,
>>
>> I am working on my goal of GSOC 2017 project: Beaglebone black bsp
>> improvement.
>>
>>
>> And i have some issue about the RTEMS-libbsd:
>>
>> if i switch on the macro USB_HAVE_UGEN in the
>> /rtemsbsd/include/rtems/bsd/local/opt_usb.h, 
>>
>> There are lots of errors when compile code. 
>>
>>
>>
>>
>> So the macro USB_HAVE_UGEN should keep unable? I see the FreeBSD on BBB
>> enable the USB_HAVE_UGEN.
>>
>>
>> Thanks
>>
>> Sichen Zhao
>>
>>
>>
>> _______________________________________________
>> devel mailing list
>> devel at rtems.org
>> http://lists.rtems.org/mailman/listinfo/devel
>>
> 
> Hello Sichen,
> 
> I only read the introduction of the man page (see [1]) but as far as I
> can tell, ugen is a generic USB driver in FreeBSD. I think it would be
> useful if you want to get some generic device Information similar to the
> ones you can get with lsusb in linux. From the look of it, I would
> expect that you also would need it for a library like libusb (which is
> used for example in OpenOCD to get a direct access to the hardware
> without any special drivers).
> 
> Normally you should not need it if there is a special driver for your
> USB device in the kernel. For example, if you want to attach a USB mass
> storage stick, you won't need it.
> 
> Basically for porting the BBB USB support to libbsd, I would expect that
> you have to pull over the host controller driver files from freebsd and
> make them compilable in rtems-libbsd. Then you would have to add the
> host controller and device drivers to nexus-devices.h. After that, it's
> quite possible that you can already use some of the examples like
> testsuite/media01. If you need any help or details on that process, feel
> free to ask.
> 
> Kind regards
> 
> Christian Mauderer
> 
> 
> [1]
> https://www.freebsd.org/cgi/man.cgi?query=ugen&manpath=FreeBSD+11.0-RELEASE+and+Ports
> 

By the way: I noted that the libbsd in your github repo is from December
2016. There have been quite some changes since then including a mayor
update to the FreeBSD head of 2016-08-23 and two smaller ones to more
recent FreeBSD head versions. Also the WLAN support has been added since
then. You might should consider an update if you still work with this
version.

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