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Re: [PATCH] IP22: Disable EARLY PRINTK, because it breaks serial console

To: "Maciej W. Rozycki" <>
Subject: Re: [PATCH] IP22: Disable EARLY PRINTK, because it breaks serial console
From: (Thomas Bogendoerfer)
Date: Wed, 7 Nov 2007 22:54:23 +0100
Cc: Martin Michlmayr <>, Ralf Baechle <>,
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <>
User-agent: Mutt/1.5.13 (2006-08-11)
On Wed, Nov 07, 2007 at 04:55:10PM +0000, Maciej W. Rozycki wrote:
> On Tue, 30 Oct 2007, Martin Michlmayr wrote:
> > * Thomas Bogendoerfer <> [2007-09-11 12:44]:
> > > Disable EARLY PRINTK, because it breaks serial console
> > 
> > Ralf, at the moment IP22 output stops after "Serial: IP22 Zilog driver
> > (1 chips).".  Can you put this patch in until there's a real fix?
>  Is it by any chance the same problem that I noticed with the DECstation 
> and reported in the thread starting at: 

it's the same problem

> "";?  If so, there is 
> a fix for the DECstation provided somewhere down the discussion which you 
> may consider porting to IP22.  I think the change to the serial core by 
> RMK mentioned there has already been applied upstream.

I ported your fix, but it didn't work for me. Maybe because the
IP22 zilog driver is still a little bit different than the DEC one.

>  Ideally, of course, all the SCC drivers should get merged eventually, but 
> due to subtle (and sometimes broken, as it is the case with the 
> DECstation) differences in wiring for various systems it may never really 
> happen, sigh...

having a more generic zilog driver with platform backends is quite high on
my todo list. But I won't make promisses when this happens...


Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea.                                                [ RFC1925, 2.3 ]

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