Stefan Brüns wrote: > On Samstag, 5. September 2020 12:25:17 CEST Stefan Seyfried wrote: >> (OT, but still might be useful to some...) >> >> Am 04.09.20 um 17:43 schrieb Ludwig Nussel: >>> It's complicated indeed. Fabian pointed me at >>> https://github.com/u-boot/u-boot/blob/9bfb567e5f1bfe7de8eb41f8c6d00f49d2b9 >>> a426/common/usb_kbd.c#L461 So u-boot doesn't even accept devices with more >>> than one endpoint. >> This might also explain why I never could input anything to U-Boot and >> GRUB on my raspis. The keyboard i tried also has some multimedia keys >> and they appear on a different input device... don't have it handy to >> check the usb descriptors, but it might certainly explain that failure. > > I think you are mixing multiple interfaces and multiple endpoints here. An > interface is a set of endpoints, the endpoints forming the data pipes for a > single protocol. An interface typically shows up as a single device in Linux. > > That said, though there is no causal relationship between multiple interfaces > and existence of an interrupt OUT endpoint, there may be a tendency of more > complex devices to have it.
Well Seife's guess about the multimedia keys might be a wrong clue but could very well be that this specific keyboard has the same issue like my usb-ps2 adapter, right? cu Ludwig -- (o_ Ludwig Nussel //\ V_/_ http://www.suse.com/ SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer HRB 36809 (AG Nürnberg) -- To unsubscribe, e-mail: opensuse-arm+unsubscr...@opensuse.org To contact the owner, e-mail: opensuse-arm+ow...@opensuse.org
