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

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Message-ID: <alpine.DEB.2.20.1611121231370.3501@nanos>
Date:   Sat, 12 Nov 2016 12:32:58 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
cc:     Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, linux-usb@...r.kernel.org,
        x86@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/4] usb: dbc: early driver for xhci debug
 capability

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