From: "H. Peter Anvin" <hpa@zytor.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: Mike Frysinger <vapier.adi@gmail.com>,
Mike Rapoport <mike@compulab.co.il>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
linux-arch@vger.kernel.org, linux-embedded@vger.kernel.org,
ksummit-2009-discuss@lists.linux-foundation.org
Subject: Re: [Ksummit-2009-discuss] Representing Embedded Architectures at the Kernel Summit
Date: Tue, 16 Jun 2009 21:26:02 -0700 [thread overview]
Message-ID: <4A38705A.3060007@zytor.com> (raw)
In-Reply-To: <20090616121909.GA1547@linux-mips.org>
Ralf Baechle wrote:
>
> I2C or similar busses can be a particularly annoying if they contain
> essential configuration information such as memory size which is needed
> long before anything else. So for far a common solution is that platforms
> are carrying a private (aka redundant, ugly) early-i2c system that's just
> about sufficient for this purpose.
>
For what it's worth, this is true for pretty much ALL systems with
removable memory modules, since Serial Presence Detect (SPD) is
electrically equivalent to I2C.
However, on most systems, even embedded, bringing up memory falls on
firmware (sometimes in the form of a boot loader) so Linux rarely sees it.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2009-06-17 4:26 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
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 [this message]
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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