linux-kernel - Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware

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Message-Id: <20080420.212656.00878559.davem@davemloft.net>
Date:	Sun, 20 Apr 2008 21:26:56 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	wmb@...mworks.com
Cc:	yhlu.kernel@...il.com, dilinger@...ued.net, hpa@...or.com,
	ebiederm@...ssion.com, mingo@...e.hu, akpm@...ux-foundation.org,
	jfannin@...il.com, linux-kernel@...r.kernel.org,
	jordan.crouse@....com
Subject: Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware

From: Mitch Bradley <wmb@...mworks.com>
Date: Sun, 20 Apr 2008 18:05:26 -1000

> In SPARC land, at least on SunOS and Solaris, it was very convenient for 
> debugging to interrupt the OS with Stop-A and use OFW to inspect the 
> system state.  That was especially handy for live crash analysis.  Dumps 
> are useful as far as they go, but they often fail to capture detailed 
> I/O device state.

In most current SPARC systems, OFW is not usable and is completely
forgotten right after bootup in order to accomodate LDOMs and CPU
hotplug.

It's a better idea, anyways, to develop more pervasive and usable
in-kernel debugger facilities.  Then it doesn't matter if you have
"cool" firmware or not. :-)

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