Groups > linux.kernel > #1520228

Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability
Date	2016-11-12 12:40 +0100
Message-ID	<sCEP7-1rX-5@gated-at.bofh.it> (permalink)
References	(4 earlier) <sBTnb-3hK-9@gated-at.bofh.it> <sBW1I-5Bk-39@gated-at.bofh.it> <sCbN7-7VX-1@gated-at.bofh.it> <sCj7Y-4hu-31@gated-at.bofh.it> <sCB4S-7qv-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Sat, 12 Nov 2016, Lu Baolu wrote:
> On 11/11/2016 08:28 PM, Peter Zijlstra wrote:
> > Again, a UART rules. Make a virtual UART in hardware, that'd be totally
> > awesome. This thing, I'm not convinced its worth having.
> 
> This is the initial work. It helps at least in cases where people need
> to dump kernel messages but lacking of a console. It's also a cheap
> way, people don't need to buy any third-party devices.
> 
> With more and more people trying and enhancing it, it will become
> more robust and helpful.

Well, not really. The hardware does not allow you what an UART allows you
to do and never will, no matter how many people are trying to enhance the
software part of it.

Thanks,

	tglx

Thread

[PATCH v4 0/4] usb: early: add support for early printk through USB3 debug port Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-01 06:10 +0100
  [PATCH v4 4/4] usb: doc: add document for USB3 debug port usage Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-01 06:10 +0100
  [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-01 06:10 +0100
    Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug  capability Thomas Gleixner <tglx@linutronix.de> - 2016-11-09 10:30 +0100
      Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-10 02:20 +0100
    Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug  capability Thomas Gleixner <tglx@linutronix.de> - 2016-11-09 10:40 +0100
      Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-10 02:30 +0100
        Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug  capability Thomas Gleixner <tglx@linutronix.de> - 2016-11-10 10:00 +0100
          Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability Peter Zijlstra <peterz@infradead.org> - 2016-11-10 12:50 +0100
            Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-11 05:40 +0100
              Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability Peter Zijlstra <peterz@infradead.org> - 2016-11-11 13:30 +0100
                Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-12 08:40 +0100
                Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug  capability Thomas Gleixner <tglx@linutronix.de> - 2016-11-12 12:40 +0100
          Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-11 03:30 +0100
            Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug capability Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-11 03:50 +0100
  [PATCH v4 2/4] x86: add support for earlyprintk via USB3 debug port Lu Baolu <baolu.lu@linux.intel.com> - 2016-11-01 06:10 +0100

csiph-web