On 10/28/15 at 04:00pm, Lu Baolu wrote: > This patch series adds support for early printk through USB3 debug port. > USB3 debug port is described in xHCI specification as an optional extended > capability. > > The first patch adds a file in debugfs, through which users can check > whether the debug capability is supported by a specific host controller. > > Patch 2 to 10 add the driver for xHCI debug capability. It interfaces with > the register set and provides the required ops (read/write/control) to upper > layers. Early printk is one consumer of these ops. The hooks for early printk > are introduced in patch 9. This design is similar to what we have done in > drivers/usb/early/ehci-dbgp.c. > > Patch 11 is a minor change to usb_debug module. This change is required to > bind usb_debug with the USB3 debug device. > > Patch 12 is the design document and user guide. > Nice work, I want to try your patches. But I have only one machine with debug capability, I think I can use it as debug target. Can I use another machine with usb 3.0 but no debug capability as the debug host? BTW, I hacked a cable according to usb 3 spec, cut vbus/d+/d-, cross wired ss pins. Thanks Dave -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
