Hi Chris, On Mon, Jun 4, 2018 at 9:12 PM, Chris Welch <chris.we...@viavisolutions.com> wrote: > We are developing a product based on the TI AM5728 EVM. The product has a > TUSB8041 USB hub on the AM5728 USB host port for additional USB ports. > > The hub works without any problems in Linux kernel, but causes u-boot to > restart when the TUSB8041 is probed during usb start. > > We are working with the 4.03.00.05 TI SDK which uses u-boot 2017.01 as the > base code. We can run "usb start" in uboot if we leave the TUSB8041 > disabled. Not useful though as we cannot communicate with any of our product > ports because they are on the hub. > > usb start fails whenever the hub is enabled: > > => usb start > starting USB... > USB0: Register 2000140 NbrPorts 2 > Starting the controller > USB XHCI 1.00 > scanning bus 0 for devices... ERROR: Configure Endpoint command returned > completion code 8. > Failed to configure xHCI endpoint > failed to set default configuration len 25, status 80000000 > BUG: failure at drivers/usb/host/xhci.c:503/_xhci_alloc_device()! > BUG! > resetting ... > > We are using the hub with all default settings except PWRCTL polarity is > active high and disable the custom battery charging feature. We configure > and enable the hub via I2C in board.c of uboot, here is an example of the > code we use: > > To configure TUSB8041: > > palmas_i2c_write_u8(TUSB8041_HUB_1, 0xA, 0x20); > > Exit TUSB8041 configuration mode and activate: > > palmas_i2c_write_u8(TUSB8041_HUB_1, 0xF8, 0x1); > > and uboot resets when usb start is requested. > > No issues if the hub is not activated by commenting out the i2c > initialization code in board.c: > > => usb start > starting USB... > USB0: Register 2000140 NbrPorts 2 > Starting the controller > USB XHCI 1.00 > scanning bus 0 for devices... 1 USB Device(s) found > scanning usb for storage devices... 0 Storage Device(s) found > > => usb tree > USB device tree: > 1 Hub (5 Gb/s, 0mA) > U-Boot XHCI Host Controller > > Any help with this would be appreciated. Thanks
What USB devices are connected behind this hub on your board? Regards, Bin _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
