From: Robert Schwebel <r.schwebel@pengutronix.de>
To: Tim Bird <tim.bird@am.sony.com>
Cc: Bill Gatliff <bgat@billgatliff.com>,
David VomLehn <dvomlehn@cisco.com>,
Robert Schwebel <r.schwebel@pengutronix.de>,
linux-embedded@vger.kernel.org,
Juergen Beisert <jbe@pengutronix.de>,
Sascha Hauer <sha@pengutronix.de>,
Wolfram Sang <wsa@pengutronix.de>
Subject: Re: flicker free booting
Date: Fri, 31 Jul 2009 22:05:55 +0200 [thread overview]
Message-ID: <20090731200555.GF29245@pengutronix.de> (raw)
In-Reply-To: <4A734A95.6060703@am.sony.com>
On Fri, Jul 31, 2009 at 12:48:37PM -0700, Tim Bird wrote:
> > Those fractions-of-seconds boot times are beyond the reach of the
> > 200 MHz-class ARM9 processors and similar, where it takes two or
> > three seconds just to load and uncompress the kernel from NOR or
> > NAND flash.
>
> While I don't disagree from a practical standpoint - at Sony using XIP
> we have been able to finish kernel boot on a 192 MHZ ARM9 in 186
> milliseconds. In the lab, anyway?
Wow, that's pretty fast; if that would be possible for standard
scenarios, it would indeed be better to do everything on the kernel
side.
Can you elaborate about the details of that experiment? Was that normal
XIP from NOR? What size has this kernel been?
rsc
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next prev parent reply other threads:[~2009-07-31 20:05 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-02 15:22 Representing Embedded Architectures at the Kernel Summit James Bottomley
2009-06-02 17:29 ` Josh Boyer
2009-06-02 17:42 ` James Bottomley
2009-06-02 17:52 ` David VomLehn
2009-06-02 18:25 ` James Bottomley
2009-06-02 18:51 ` Josh Boyer
2009-06-02 19:30 ` Tim Bird
2009-06-02 20:37 ` [Ksummit-2009-discuss] " James Bottomley
2009-06-02 20:44 ` Bill Gatliff
2009-06-02 21:34 ` Robert Schwebel
2009-06-03 3:35 ` Greg KH
[not found] ` <20090731152617.GW29245@pengutronix.de>
2009-07-31 15:53 ` flicker free booting Robert Schwebel
2009-07-31 18:03 ` David VomLehn
2009-07-31 18:09 ` Robert Schwebel
2009-07-31 18:42 ` Bill Gatliff
2009-08-03 8:19 ` Sascha Hauer
2009-08-03 8:37 ` Geert Uytterhoeven
2009-07-31 18:46 ` Bill Gatliff
2009-07-31 19:48 ` Tim Bird
2009-07-31 19:51 ` Bill Gatliff
2009-07-31 20:05 ` Robert Schwebel [this message]
2009-08-01 1:26 ` Tim Bird
2009-07-31 19:25 ` Bill Gatliff
2009-08-01 14:25 ` Jamie Lokier
2009-06-03 0:03 ` [Ksummit-2009-discuss] Representing Embedded Architectures at the Kernel Summit David VomLehn
2009-06-03 0:52 ` Eric W. Biederman
2009-06-03 1:42 ` Steven Rostedt
2009-06-02 22:21 ` Jean-Christophe PLAGNIOL-VILLARD
2009-06-03 6:24 ` [Ksummit-2009-discuss] " Ralf Baechle
2009-06-10 23:13 ` Kumar Gala
2009-06-14 3:48 ` Grant Likely
2009-06-10 23:08 ` Kumar Gala
2009-06-02 17:29 ` Grant Likely
2009-06-02 17:45 ` David VomLehn
2009-06-02 18:46 ` Grant Likely
2009-06-02 17:48 ` James Bottomley
2009-06-03 12:17 ` Mark Brown
2009-06-04 18:18 ` Grant Likely
2009-06-02 21:10 ` Russell King
2009-06-02 21:16 ` Bill Gatliff
2009-06-02 21:18 ` Geert Uytterhoeven
2009-06-02 21:40 ` Robert Schwebel
[not found] ` <20090602214005.GL32630@pengutronix.de>
2009-06-02 21:48 ` Russell King
[not found] ` <10f740e80906021418i1d58f5eer940e7a8ec9fb8b9e@mail.gmail.com>
2009-06-03 7:07 ` [Ksummit-2009-discuss] " Ralf Baechle
2009-06-04 20:08 ` Grant Likely
[not found] ` <4A2596B4.3020309@billgatliff.com>
2009-06-04 20:15 ` Grant Likely
[not found] ` <3340601010994331832@unknownmsgid>
2009-06-04 20:24 ` Grant Likely
2009-06-03 6:53 ` [Ksummit-2009-discuss] " Ralf Baechle
2009-06-03 13:04 ` Catalin Marinas
2009-06-03 13:18 ` Josh Boyer
2009-06-03 13:45 ` Catalin Marinas
2009-06-03 14:11 ` Josh Boyer
2009-06-03 14:06 ` Jean-Christophe PLAGNIOL-VILLARD
2009-06-03 16:19 ` James Bottomley
2009-06-03 17:09 ` Russell King
2009-06-03 18:43 ` Andrew Morton
2009-06-03 19:01 ` James Bottomley
2009-06-04 3:11 ` David VomLehn (dvomlehn)
2009-06-04 3:24 ` Mike Frysinger
2009-06-04 9:23 ` Mel Gorman
2009-06-03 19:08 ` Catalin Marinas
2009-06-10 9:42 ` Thomas Petazzoni
2009-06-16 6:42 ` Mike Rapoport
2009-06-16 8:06 ` Mike Frysinger
2009-06-16 12:19 ` [Ksummit-2009-discuss] " Ralf Baechle
2009-06-17 4:26 ` H. Peter Anvin
2009-06-17 15:04 ` Ralf Baechle
2009-06-17 17:14 ` H. Peter Anvin
2009-06-16 16:06 ` Grant Likely
2009-06-16 18:18 ` Jamie Lokier
2009-06-16 19:28 ` Grant Likely
2009-06-16 20:07 ` Jamie Lokier
2009-06-16 20:10 ` Marcel Holtmann
2009-06-16 21:04 ` Grant Likely
2009-06-18 3:05 ` Paul Mundt
2009-06-17 14:31 ` Kumar Gala
2009-06-18 2:51 ` Paul Mundt
2009-06-19 2:59 ` Kumar Gala
2009-06-19 3:00 ` Paul Mundt
2009-06-19 7:53 ` Kumar Gala
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