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Date: Sat, 1 Mar 2008 07:13:15 -0600
From: Josh Boyer <jwboyer@linux.vnet.ibm.com>
To: Olof Johansson <olof@lixom.net>
Subject: Re: Sequoia build with KDBG
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On Fri, 29 Feb 2008 23:02:50 -0600
Olof Johansson <olof@lixom.net> wrote:

> On Fri, Feb 29, 2008 at 08:30:15PM -0600, Josh Boyer wrote:
> 
> > > poor man's debugging works fine if a serial port is available, but my 
> > > Sequoia platform doesn't get that far!  I use u-boot to download and 
> > > boot my image, and I don't get any serial output after the boot completes:
> > 
> > By "poking characters out the serial port" I meant I literally coded up
> > assembly functions to setup MMU translations and poke hex values at hard
> > coded addresses.  That's why it's "poor man's".  If you had a working
> > serial port out of the box, that would be a luxury ;).
> 
> Does 4xx have support for udbg and xmon? That would be a good first step
> in getting an in-kernel debugger facility going.

Yes.  Or at least it did as of a few kernel releases ago when I last
tested it.  It's helpful for a number of thing, but debugging extremely
early stuff isn't possible with it.

josh