From: Wolfgang Denk <wd@denx.de>
To: Jaap-Jan Boor <jjboor@aimsys.nl>
Cc: linuxppc-embedded@lists.linuxppc.org, JACK HWAN <jhfami@yahoo.co.kr>
Subject: Re: Booting time
Date: Tue, 10 Feb 2004 20:52:42 +0100 [thread overview]
Message-ID: <20040210195247.432DDC1215@atlas.denx.de> (raw)
In-Reply-To: Your message of "Tue, 10 Feb 2004 08:48:54 +0100." <93314AB1-5B9D-11D8-B8DD-000A95B15278@aimsys.nl>
Dear Jaap-Jan,
in message <93314AB1-5B9D-11D8-B8DD-000A95B15278@aimsys.nl> you wrote:
>
> > For a "standard" system with 50 MHz CPU and 50 MHz bus clock I can
> > demonstrate that it takes not more than 3...4 seconds from power on
> > until the first application process is running.
>
> What kind of setup is that? A very small ramdisk or flash disk?
This is with a standard setup; root filesystem size is in the range
of 5...10 MB. It works with a ramdisk (if not compressed), or with a
MTD based (non-compressing) filesystem. The second option is more
efficient regarding memory footprint in RAM.
A MTD mounted (read-only) ext2 filesystem in flash is pretty fast.
> Does the (u-) boot loader do extensive ram tests?
Just the basic tests which are also used to auto-size the RAM.
Best regards,
Wolfgang Denk
--
See us @ Embedded World, Nuremberg, Feb 17 - 19, Hall 12.0 Booth 440
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
The only way to learn a new programming language is by writing pro-
grams in it. - Brian Kernighan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2004-02-10 19:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-09 1:39 Booting time JACK HWAN
2004-02-09 4:10 ` Eugene Surovegin
2004-02-09 13:44 ` Wolfgang Denk
2004-02-10 7:48 ` Jaap-Jan Boor
2004-02-10 19:52 ` Wolfgang Denk [this message]
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