linux-kernel - Re: Boot Consoles question...

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Message-ID: <200907101028.03153.rgetz@blackfin.uclinux.org>
Date:	Fri, 10 Jul 2009 10:28:03 -0400
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Ingo Molnar" <mingo@...e.hu>
CC:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: Re: Boot Consoles question...

On Fri 10 Jul 2009 06:28, Ingo Molnar pondered:
> 
> * Robin Getz <rgetz@...ckfin.uclinux.org> wrote:
> 
> > On Sat 4 Jul 2009 12:07, Robin Getz pondered:
> > > On Sat 4 Jul 2009 06:29, Ingo Molnar pondered:
> > > > Could be changed i guess ... but is it really an issue?
> > > 
> > > It is just a change from "normal" (when the kernel has no boot
> > > console).
> > > 
> > > >  One artifact 
> > > >  could be manual scroll-back - it would perhaps be nice indeed to
> > > >  allow the scrollback to the top of the bootlog.
> > > 
> > > Exactly.
> > > 
> > > One of my thoughts (was since CON_PRINTBUFFER isn't used after 
> > > register_console()) - was for the CON_BOOT's CON_PRINTBUFFER flag to
> > > control the clearing of the CON_PRINTBUFFER for the real console or
> > > not... 
> > > 
> > > All early_printk consoles that I looked at have their
> > > CON_PRINTBUFFER set.
> > > 
> > > Which means that something like should do the trick -- allow people
> > > who want 
> > > to override things to do so, and still have the today's setup work
> > > as is...
> > 
> > I guess no one liked that idea?
> 
> No, this means no-one objected :)

Silence is consensus?

> > How about at least making sure that the real console gets a 
> > message that something is on the bootconsole? Right now the switch 
> > message:
> > 
> > console handover:boot [early_shadow0]  -> real [ttyBF0]
> > 
> > only is printed on the bootconsole, not on the real console - so 
> > someone looking at the real console may not know there is anything 
> > on the boot console. They just think that things are missing...
> 
> Mind sending a full (changelogged, titled, etc.) patch for the other 
> bit as well? It kind of overlaps this one but both make sense, 
> especially if people end up objecting against the more intrusive one 
> and it gets dropped/reverted ;-)

Will do - (as soon as I get my system up and running again - moved buildings, 
so still unpacking)...


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