On Thursday, December 17, 2015 at 10:12:08 AM, Aaron Williams wrote: > Hi all,
Hi Aaron, > I maintain U-Boot for the Cavium Octeon series of 64-bit MIPS processors > and have been experiencing problems with USB 3 hubs with XHCI. > > If I plug in a USB 3 thumb drive into a USB 3 hub it is not seen. After > fixing numerous endian issues USB 3 thumb drives are fully supported via > XHCI as long as there is no USB hub in the path. > > Delving into the XHCI and USB hub code it appears that there is no > proper support for USB 3 hubs which have a number of differences from > USB 2. Is any work going on in this area? Not to my knowledge, sorry. > For example, the hub descriptor format has changed as well as the BOS > descriptor. I'm looking at the Linux XHCI and hub code and see a lot of > USB 3 changes not present in U-Boot. > > I have been backporting a lot of the support to our current bootloader > code base which is based on the 7/2013 release. > > I might add that I found a lot of issues in the USB code, especially > XHCI that are endian related since our Octeon processors are running in > big endian mode, plus the fact that DMA addresses are not the same as > pointer addresses, plus the USB code is not 64-bit friendly. I see, I suspect the code was mostly tested on ARMv7 which is why those issues went undetected. > While I can gladly share my code and changes, we currently are not using > the latest release, nor will I have time to upgrade to it for at least > several months due to too many other projects on my plate (it doesn't > help matters that we don't use git internally for U-Boot). Is it possible for you to boot latest mainline U-Boot on octeon, fix the issues, submit the fixes and then backport them? > At some point I would love to get our code base merged in but this will > be a significant effort due to the sheer amount of code involved. Patches are welcome :) > -Aaron Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
