Moin,
Am Mittwoch, 2. September 2020, 10:28:21 CEST schrieb Ludwig Nussel:
> Guillaume Gardet wrote:
> >> -----Original Message-----
> >> From: Ludwig Nussel <[email protected]>
> >> Sent: 01 September 2020 18:51
> >> To: [email protected]
> >> Subject: [opensuse-arm] rpi to rpi via usb gadget
> >>
> >> Hi,
> >>
> >> I've tried to use the USB OTG features of the RPi4 to remote control an
> >> RPi3 with MicroOS 15.2 using pikvm. That works fine as soon as Linux
> is booted in
> >> the RPi3. Fails in U-Boot and therefore grub though. U-Boot doesn't
> detect the
> >> simulated devices. On the Pi4 the kernel throws error
> >> messages:
> >> [ 104.168251] configfs-gadget gadget: usb_ep_queue error on int
> endpoint -11
> >>
> >> Is that an issue on our side in U-Boot or somewhere else?
> >
> > Could it be related to
> https://github.com/raspberrypi/firmware/issues/1322 ?
>
> The pikvm website also mentions that the OTG mode doesn't work with some
> PC BIOSes¹ while an Arduino does the job. So maybe that OTG descriptor
> confuses them too? Is there a way to make the kernel not generate that
> descriptor to test?
Forcing the controller in peripheral only mode might work. Something like that
as device tree overlay maybe:
&usb {
dr_mode = "peripheral";
};
That's visible as a dr_mode file below /sys as well.
Cheers,
Fabian
> cu
> Ludwig
>
> [1]https://github.com/pikvm/pikvm#limitations
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