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Date:      Sat, 14 May 2016 13:50:23 -0500
From:      Neal Horman <neal@wanlink.com>
To:        freebsd-usb@freebsd.org
Subject:   Re: ehci_disown - Olimex ARM A20 Lime & USB FTDI RS-485 shuts down USB port
Message-ID:  <5737736F.9040308@wanlink.com>
In-Reply-To: <mailman.35.1463054400.56334.freebsd-usb@freebsd.org>
References:  <mailman.35.1463054400.56334.freebsd-usb@freebsd.org>

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On 5/12/16 7:00 AM, freebsd-usb-request@freebsd.org wrote:

>> ehci_disown() means that there should be a full speed controller that =
should
>> handle the device, because it is not high-speed. Does your board have
>> OHCI/UHCI or only EHCI? How are the USB parts wired. Is there a High-S=
peed TT
>> (USB HUB chip) connected to the EHCI port?
> The A20 SoC has an OHCI controller but the ALLWINNER kernel is missing =
the
> ohci driver. There is a patch for review here: https://reviews.freebsd.=
org/D5481
>
> Cheers,
> Jared

Jared:
     Thanks for pointing me to the patch, that was very helpful.

All:
     I can report that I was able to apply the D5481 patch to svn.head=20
revision 298609 after changing the kernel conf A20 patched file name to=20
ALLWINNER.
     The kernel built without errors.
     I installed the kernel, and the ohci driver appears to attach and=20
work correctly with my FTDI devices.

Emanuel:
     Overall, I'd like to see this committed because it appears to be=20
functional.
     Although, I wouldn't / don't expect to have to include the "device=20
ohci" and "device generic_ohc" drivers for the kernel to work correctly=20
on the platform.
     It just doesn't make sense in my mind and doesn't feel right.

     Thanks for the work that your doing on the Allwinner SOCs !

Regards
Neal Horman


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