Message-ID: <00c501c1dce3$0ed806d0$7e0aa8c0@bridge>
From: "Jeremy Jackson" <jerj@coplanar.net>
To: "Martin J. Bligh" <fletch@aracnet.com>, <linux-kernel@vger.kernel.org>
In-Reply-To: <1650399759.1018005181@[10.10.2.3]>
Subject: Re: Faster reboots (and a better way of taking crashdumps?)
Date: Fri, 5 Apr 2002 12:47:08 -0800
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Sender: linux-kernel-owner@vger.kernel.org

for 2, the BIOS sets the hardware to a known state,
or if you can trigger *the* hardware reset line,
which will also do that, then you're going through
the BIOS again.  Now if you made your own bios...
see www.linuxbios.org.

there are patches where a kernel can load another
kernel, also.

As for taking crashdumps on the way up, I believe
(SGI's ?) linux kernel crash dumps does *exactly*
this.

Jeremy

----- Original Message -----
From: "Martin J. Bligh" <fletch@aracnet.com>
To: <linux-kernel@vger.kernel.org>
Sent: Friday, April 05, 2002 11:13 AM
Subject: Faster reboots (and a better way of taking crashdumps?)


> My real motivation for this isn't actually faster reboots,
> it's rebooting at all - I have some strange hardware that
> won't do init 6 in traditional ways ... but it might mean
> a faster reboot for others.
>
> What's to stop me rebooting by having machine_restart load
> the first sector of the first disk (as the BIOS does), where
> the LILO code should be, and just jumping to it?
>
> 1. Are there tables that are created by the BIOS that we
> destroy during Linux runtime? mps tables spring to mind -
> I can't see where we preserve them ...
>
> 2. Things that are reset by reboot that we don't reset during
> normal kernel boot?
>
> As a side effect, this means we could potentially take
> crashdumps on the way up, rather than the way down, so
> the kernel is more likely to be in a working state (we'd
> have to load a minimal kernel / crashdumper to take the
> dump first ... this is similar to what we did with PTX).
>
> M.
>
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