USB gadget driver dbgp can be used as an EHCI debug dongle in replacement for product like Net20DC. With it one can receive early kernel messages from remote targets over USB. See parameter earlyprintk=dbgp for target kernel requirements and configuration. The two patches are required for dbgp gadget driver to work. Longterm plan: I think G_DBGP_PRINTK is an odd hack and could be removed. Exposing the debug descriptor can be implemented in cdc_acm so that we could seemlessly reconfigure endpoint from the 8 byte payload limitation EHCI Debug Port has, to 512 bytes, once ehci-hcd with DMA is available. Handling of the termios CLOCAL flag calls for some discussion and I am not that familiar with the tty infra u_serial uses. See the previous change around gserial_disconnect(): http://permalink.gmane.org/gmane.linux.usb.general/4260 Regards, Kyösti -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
