On 08/18/2015 05:55 AM, Guillaume Gardet wrote: > Hi Stephen, > > I want to add USB keyboard support to raspberry pi but I get the > following error when I do 'usb start' with a keyboard plugged-in: > unable to get device descriptor (error=-22) > > Ethernet chip and mass storage devices are found. > > I found this thread from February: > http://lists.denx.de/pipermail/u-boot/2015-February/206593.html > which says: > ********** > This error is because the keyboard driver uses interrupt transfers, and > these aren't implemented in DWC2 > ********** > > But in April, you added a patch series including "usb: dwc2: implement > interrupt transfers". > But there is also a note: > ********** > With all these commits applied, both my USB keyboards (one LS Lenovo > and > one FS Dell) work correctly when there is no USB hub between the SoC > and > the keyboard; We still need split transactions to be implemented for > hubs > to work. > ********** > > So, I guess this is expected that USB keyboard does not work on DWC2 / > RPi B since it uses a USB hub (SMSC LAN9512)?
Yes, that's unfortunately expected at present. _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
