From: Robert Kaiser <rob@sysgo.de>
To: Pavel Machek <pavel@suse.cz>
Cc: Patrizio Bruno <patrizio@dada.it>, linux-kernel@vger.kernel.org
Subject: Re: Disk is cheap?
Date: Tue, 6 Feb 2001 15:49:30 +0100 [thread overview]
Message-ID: <01020616023400.03941@rob> (raw)
In-Reply-To: <01013114393200.01502@rob> <200101311612.RAA02360@rob.devdep.sysgo.de> <20010203135518.A1203@bug.ucw.cz>
In-Reply-To: <20010203135518.A1203@bug.ucw.cz>
On Sam, 03 Feb 2001 you wrote:
> > Usually most of the startup time is spent by the BIOS doing
> > extensive self-test stuff and for firing up services (http,
> > inetd, sendmail, ...) that many embedded systems have little use
> > for.
>
> Actually, most of that time is spent running bash/sleep 1. Startup
> scripts tend to be poorly designed.
Yes!
> > I have a 25MHz 386EX (~2.2 Bogomips) here that boots Linux out of ROM
> > in roughly 30 seconds. Most of _that_ time however is spent decompressing
> > the kernel.
>
> You might want to set up XIP and run kernel directly off the ROM...
>
Hmm, that board has only 512KB ROM. I can fit a minimal Linux kernel
and root-FS in that, but only if it's compressed. ROM, in my experience,
is more expensive than RAM, so it often makes sense to save ROM space
even at the expense of using a little more RAM.
But I'm curious: is there a simple procedure to set up a linux Kernel
to execute from ROM ?
----------------------------------------------------------------
Robert Kaiser email: rkaiser@sysgo.de
SYSGO RTS GmbH
Am Pfaffenstein 14 phone: (49) 6136 9948-762
D-55270 Klein-Winternheim / Germany fax: (49) 6136 9948-10
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next prev parent reply other threads:[~2001-02-06 15:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-31 13:29 Disk is cheap? Robert Kaiser
2001-01-31 14:55 ` Patrizio Bruno
2001-01-31 16:12 ` Robert Kaiser
2001-02-01 12:34 ` Wojtek Pilorz
2001-02-03 12:55 ` Pavel Machek
2001-02-06 14:49 ` Robert Kaiser [this message]
2001-02-06 15:28 ` Hacksaw
2001-02-06 15:30 ` Robert Kaiser
2001-02-06 20:17 ` John Fremlin
2001-02-24 13:59 ` Ralf Baechle
2001-02-26 11:32 ` Robert Kaiser
-- strict thread matches above, loose matches on Subject: below --
2001-01-30 18:58 mirabilos
2001-01-31 3:27 ` John R Lenton
2001-02-02 14:48 ` Pavel Machek
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