On Tue, 10 May 2016 17:03:36 -0500
Neal Horman wrote:
> Hello,
> Sorry for the cross post, but I'm not sure were this should land.
> I posted on https://forums.freebsd.org/threads/56211/ and it was
> suggested that I ask here.
>
>
> I'm having problems trying to get my host to recognize a USB FTDI
> RS-485 serial port on an Olimex ARM A20 Lime host.
>
> To be clear, this is not a "I need to connect to the host console
> port" problem, that is done and works.
>
> I'm trying to use the RS-485 port to talk to Modbus devices with a
> custom application.
>
> The FTDI device has been tested on other hosts, and it works.
> When I use the same device on this host running Linux, it works
> just fine.
>
> When I insert the FTDI RS-485 device (or any other FTDI or Prolific
> serial device) into the FreeBSD host USB connector with
> hw.usb.ehci.debug = 1 I get:
>
> ehci_roothub_exec: ehci after reset, status=0x1801
> ehci_disown: index=1 lowspeed=0
>
> and then the port is unresponsive to any device plug events afterwards.
>
> I used svn.head -r 298609 and crochet w/ a derived version of
> cubieboard2 board profile and the ALLWINNER kernel.
> I've tried the Olimex DTBs that get built from that profile, but
> the cubieboard2 DTB is the only one that gets me to a login prompt,
> which isn't 100%, so I ran down the "build a DTB" road.
> I've successfully created a DTB, using
> gnu/dts/arm/sun7i-a20-olinuxino-lime.dts, but commenting out the usb otg
> port (I won't be using that port anyway) vbus detect pin configuration
> that causes the kernel to panic on boot, which gets me mmm... about 98%
> I'd say of what I think is a correct DTB for this host platform.
>
> Can anybody clue me into what is happening when I plug in the USB
> serial device, and how to deal with it ?
>
> Any help with this would be appreciated !
> Without any suggestions, I'm at the end of the road, and I'll have
> to go back to Linux, which I'd rather not do.
>
>
> TIA, regards
>
> Neal Horman
As other said the OHCI support is currently in phab, I need to look
what's missing (if anything is missing) and commit it.
For the DTS part you should be able to use the dts from
sys/gnu/dts/arm/sun7i-a20-olinuxino-lime2.dts without any problem.
I don't have a lime2 myself but I've been using the a20-som-evb for
Allwinner dev for some times now.
--
Emmanuel Vadot
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