Roman, You root filesystem doesn't have udev support, right? without udev support kernel modules will not be loaded automatically. With your current setup, please run command 'modprobe musb_am335x' after linux is booted, then provide its console log and the output of lsmod command, and output of the new version of chkusb.sh attached below. (Please visit the site to view this file) [quote user="Roman Ronge"]Bin Liu, you have suggested that the USB modules should be installed on Linux boot. I don't see any evidence of it in dmesg, and even if I run lsmod, there is no modules loaded listed. Is this supposed to happen always or only if a attached USB device like a hub chip is detected?[/quote] Required kernel modules are supposed to be loaded automatically right after the root filesystem is mounted, typically the auto-loading is done by udev. [quote user="Roman Ronge"]As described before, we have two USB2512 hubs connected to the CPU USB ports 0 and 1. For now I am only concerned with bringing up USB0.[/quote] We have to solve the usb bus initialization issue first, then we can check if the hub still has issue.
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