linux-kernel - Re: [draft] Blackfin Early Printk implmentation

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Message-ID: <20070817175911.GA22046@uranus.ravnborg.org>
Date:	Fri, 17 Aug 2007 19:59:11 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Robin Getz <rgetz@...ckfin.uclinux.org>
Cc:	linux-kernel@...r.kernel.org, Gerd Hoffmann <kraxel@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Bryan Wu <bryan.wu@...log.com>,
	Sonic Zhang <sonic.adi@...il.com>,
	Mike Frysinger <vapier.adi@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [draft] Blackfin Early Printk implmentation

On Fri, Aug 17, 2007 at 01:36:39PM -0400, Robin Getz wrote:
> The patch (for review - not inclusion - I will send to Bryan if no one has any 
> major objections, and he can push it via git) implements early printk for the 
> Blackfin architecture.
> 
> It also adds an early exception handler, so if an 
> interrupt/exception/violation happens before the kernel enables it's 
> interrupts (yes that does happen periodically, and it is a nice to have a 
> debug feature to help , that we don't go back to the bootloaders exception 
> processing table...
> 
> It also removes some of the crap that was trying to implement the same thing 
> (poorly).

So this patch does three things at least:
-> adds early_printk
-> delete cruft emulating early printk
-> add an early excaption handler

That seems to explain why I could not follow your code changes.
A more fine grained splitup would have helped here.

I noticed that you copied the actual early_printk code from x86_64.
What was preventing you from just using the x86_64 code here?
A simple
#include <arch/x86_64/boot/early_printk.c>
in the blackfin early_printk should do the trick.

alpha btw uses the implementation in lib/*printf.c
Are there a specific reason why blackfin and x86_64 does not do the same?
Thinking that all should do the same so maybe alpha ought to change...

	Sam
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