Re: "Hearty AOL" for kexec

From: Richard B. Johnson (
Date: Wed Oct 23 2002 - 12:31:09 EST

On 23 Oct 2002, Torrey Hoffman wrote:

> On Wed, 2002-10-23 at 08:03, Eric W. Biederman wrote:
> > Pavel Roskin <> writes:
> [...]
> > > I really want to see this feature in the kernel. It is very useful in
> > > embedded systems. Just imagine loading the bootstrap kernel, then
> > > downloading the new kernel over anything - HDLC, 802.11, USB, decrypting
> > > it from flash etc. Possibilities are infinite.
> >
> > Yay!!!! My first embedded developer who doesn't think it is silly to
> > use a kernel as a bootloader :) Or at least the first to admit they
> > embedded developer.
> Yeah, another AOL "Me Too" here - I'm an embedded linux developer and
> think would be useful. Being able to network boot the device, download
> software to a flash, and then directly "kexec" boot from the kernel on
> the flash would be nice.
> Anything that reduces dependencies on the BIOS is good. I'd use this
> feature if it was available.

But 'downloading' (actually uploading) software and writing it to
flash for a re-boot is a trivial user-mode task. The actual boot
from such a virtual disk takes 4 seconds on a real system (AMD SC520)
processor in an embedded system. You don't need any special kernel

Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
   Bush : The Fourth Reich of America

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