linux-kernel - Re: Gaps in logs while using usb-serial as a console

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Message-ID: <968c62ca-0ef2-4bf1-a17b-a6d88d5e2e20@rowland.harvard.edu>
Date:   Mon, 30 Oct 2023 10:19:54 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     ariel marcovitch <arielmarcovitch@...il.com>, johan@...nel.org,
        linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Gaps in logs while using usb-serial as a console

On Mon, Oct 30, 2023 at 09:30:15AM +0100, Greg KH wrote:
> On Mon, Oct 30, 2023 at 10:15:30AM +0200, ariel marcovitch wrote:
> > > Please realize that usb-serial console was the result of me loosing a
> > > drunken bet.  It's amazing it works at all.  For "fake" devices like
> > LOL your drunken bet was quite helpful to some people
> > Because modern PCs come without a serial port, I wanted to use it to
> > see early logs on my crashing kernel without having to use printk
> > delay and things like that.
> > I'm curious as to how kernel people debug PCs in general...
> 
> We use a usb debug port connection (it's a special cable).

Sometimes people use netconsole (see 
Documentation/networking/netconsole.rst).  I don't know how common it is 
nowadays, and it may not be quite as reliable as a debug port device, 
but it should still work.  And it doesn't require special hardware.

Alan Stern