I suggest to enable CONFIG_EARLY_PRINTK_USB_XDBC and USB_XHCI_DBGCAP in
Bionic HWE kernels as this will allow to debug via serial console with a
simple USB 3 crossover-cable (aka "USB 3.0 super-speed A-to-A debugging
cable") without the need of a physical RS-232 interface.
--
You received this
Series tracked for Cosmic, as per Seth's comment:
USB_XHCI_DBGCAP has been enabled since cosmic. I've now enabled
CONFIG_EARLY_PRINTK_USB_XDBC as well in disco.
** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status:
@ubuntu-kernel-bot: Missing things can't be logged. ;-)
@all: Don't use simple A-to-A USB cables for USB 3.x slave devices as
they can fry your hardware. See cable specs in section 5.5.2 of the USB
3.0 specification (https://i.stack.imgur.com/YwsX3.png).
** Changed in: linux (Ubuntu)
