On Mon, Nov 07, 2016 at 02:09:31PM +0000, Jon Hunter wrote: > > On 07/11/16 13:28, Thierry Reding wrote: > > * PGP Signed by an unknown key > > > > On Sun, Sep 18, 2016 at 12:28:52PM +0200, Paul Kocialkowski wrote: > >> Nyan boards only have host USB ports (2 external, 1 internal), there is > >> no OTG-enabled connector. > >> > >> Signed-off-by: Paul Kocialkowski <contact@xxxxxxxx> > >> --- > >> arch/arm/boot/dts/tegra124-nyan.dtsi | 2 +- > >> 1 file changed, 1 insertion(+), 1 deletion(-) > > > > Where is this information coming from? I don't have one of the Nyans > > myself, but one of the Tegra132 devices I have, which I think was > > derived from one of the Nyans uses one of the external host ports as > > forced recovery port, for which it would need OTG. > > > > I suspect that the way to get U-Boot onto the Nyans is via tegrarcm? > > In that case I think one of the ports must be OTG. > > It is true that the port on the back on the nyan-big can be used with > recovery mode. I was thinking that this is not a true OTG port as it is > just a 4-pin type A socket and does not have an ID pin. Thinking some > more about this the USB spec does include a "Host Negotiation Protocol > (HNP)" that allows a host and device to swap roles and so keeping it as > OTG seems valid afterall. I don't think the bootrom implements that though. I expect recovery mode to just program the controller in device mode, without performing any negotiation. Peter. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
