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From: zonque@gmail.com (Daniel Mack)
To: linux-arm-kernel@lists.infradead.org
Subject: Appended DTB files for multi-machine kernels
Date: Thu, 04 Jul 2013 19:57:53 +0200	[thread overview]
Message-ID: <51D5B7A1.60609@gmail.com> (raw)
In-Reply-To: <alpine.LFD.2.03.1307041322070.18597@syhkavp.arg>

Hi Nicolas,

On 04.07.2013 19:28, Nicolas Pitre wrote:
> On Thu, 4 Jul 2013, Daniel Mack wrote:
>> I'm open to opinion and sugesstions :)
> 
> What you describe above more or less fits the definition of what I 
> called the "impedance matcher".  However it doesn't need to be part of 
> the kernel at all.  But you should make it into a separate binary.
> 
> Please have a look at the bottom of this post for a more comprehensive 
> description: http://article.gmane.org/gmane.linux.ports.arm.kernel/242929

Thanks for the link. Interesting read indeed.

The only thing I'm pondering about is that we already have generic
loader code in Linux and a build system that supports a wide range of
platforms. I don't know whether it's worth opening that can of worms
again and re-implement all details about load addresses, compiler flags,
device-tree parsing code yet once again. At least in terms of LOCs, we
would certainly be better off doing it inside the kernel.

But I generally second your opinion about pushing vendors to do it
right, so I might give that approach a shot soon; there is no code yet
anywhere I take it?


Thanks,
Daniel

WARNING: multiple messages have this Message-ID (diff)
From: Daniel Mack <zonque-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Nicolas Pitre <nico-vtqb6HGKxmzR7s880joybQ@public.gmane.org>
Cc: stigge-uj/7R2tJ6VmzQB+pC5nmwQ@public.gmane.org,
	Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	"devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org"
	<devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>,
	Sven Neumann <s.neumann-5g8ninUHluJWk0Htik3J/w@public.gmane.org>,
	Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: Appended DTB files for multi-machine kernels
Date: Thu, 04 Jul 2013 19:57:53 +0200	[thread overview]
Message-ID: <51D5B7A1.60609@gmail.com> (raw)
In-Reply-To: <alpine.LFD.2.03.1307041322070.18597-hIgblCxmbi8OMTOF05IoTw@public.gmane.org>

Hi Nicolas,

On 04.07.2013 19:28, Nicolas Pitre wrote:
> On Thu, 4 Jul 2013, Daniel Mack wrote:
>> I'm open to opinion and sugesstions :)
> 
> What you describe above more or less fits the definition of what I 
> called the "impedance matcher".  However it doesn't need to be part of 
> the kernel at all.  But you should make it into a separate binary.
> 
> Please have a look at the bottom of this post for a more comprehensive 
> description: http://article.gmane.org/gmane.linux.ports.arm.kernel/242929

Thanks for the link. Interesting read indeed.

The only thing I'm pondering about is that we already have generic
loader code in Linux and a build system that supports a wide range of
platforms. I don't know whether it's worth opening that can of worms
again and re-implement all details about load addresses, compiler flags,
device-tree parsing code yet once again. At least in terms of LOCs, we
would certainly be better off doing it inside the kernel.

But I generally second your opinion about pushing vendors to do it
right, so I might give that approach a shot soon; there is no code yet
anywhere I take it?


Thanks,
Daniel

  reply	other threads:[~2013-07-04 17:57 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-04 16:56 Appended DTB files for multi-machine kernels Daniel Mack
2013-07-04 16:56 ` Daniel Mack
2013-07-04 17:11 ` Mark Brown
2013-07-04 17:11   ` Mark Brown
2013-07-04 21:34   ` Arnd Bergmann
2013-07-04 21:34     ` Arnd Bergmann
2013-07-04 23:02     ` Daniel Mack
2013-07-04 23:02       ` Daniel Mack
2013-07-05  8:32     ` Magnus Damm
2013-07-05  8:32       ` Magnus Damm
2013-07-04 17:28 ` Nicolas Pitre
2013-07-04 17:28   ` Nicolas Pitre
2013-07-04 17:57   ` Daniel Mack [this message]
2013-07-04 17:57     ` Daniel Mack
2013-07-04 18:27     ` Nicolas Pitre
2013-07-04 18:27       ` Nicolas Pitre
2013-07-26 16:13   ` Daniel Mack
2013-07-26 16:13     ` Daniel Mack
2013-07-26 16:44     ` Nicolas Pitre
2013-07-26 16:44       ` Nicolas Pitre
2013-07-29 21:23     ` [RFC PATCH 0/2] impedance-matcher generic improvements Jason Cooper
2013-07-29 21:23       ` Jason Cooper
2013-07-29 21:24       ` [PATCH 1/2] add cscope Makefile target Jason Cooper
2013-07-29 21:24         ` Jason Cooper
2013-07-29 21:24       ` [RFC PATCH 2/2] WIP: Get kernel and dtb addresses from command line Jason Cooper
2013-07-29 21:24         ` Jason Cooper
2013-07-30  7:48       ` [RFC PATCH 0/2] impedance-matcher generic improvements Daniel Mack
2013-07-30  7:48         ` Daniel Mack
2013-07-30 13:17         ` Jason Cooper
2013-07-30 13:17           ` Jason Cooper
2013-07-30 13:37           ` Daniel Mack
2013-07-30 13:37             ` Daniel Mack
2013-07-30 14:42             ` Jason Cooper
2013-07-30 14:42               ` Jason Cooper
2013-08-02 15:51     ` [RFC PATCH V2 0/9] " Jason Cooper
2013-08-02 15:51       ` [RFC PATCH V2 1/9] add cscope Makefile target Jason Cooper
2013-08-02 15:51       ` [RFC PATCH V2 2/9] separate common functions from board specific Jason Cooper
2013-08-02 15:51       ` [RFC PATCH V2 3/9] rename board.c to board-raumfeld.c Jason Cooper
2013-08-02 15:51       ` [RFC PATCH V2 4/9] s/.name/.compatible/ Jason Cooper
2013-08-02 21:52         ` Stephen Warren
2013-08-03 14:07           ` Jason Cooper
2013-08-03 14:16             ` Daniel Mack
2013-08-02 15:51       ` [RFC PATCH V2 5/9] directly include needed headers Jason Cooper
2013-08-02 15:51       ` [RFC PATCH V2 6/9] serial: split out 8250 code, configurable reg addr Jason Cooper
2013-08-02 15:51       ` [RFC PATCH V2 7/9] add generic board code Jason Cooper
2013-08-02 15:51       ` [RFC PATCH V2 8/9] make appending images/dtbs optional Jason Cooper
2013-08-02 15:51       ` [RFC PATCH V2 9/9] appended dtbs works! Jason Cooper
2013-08-02 19:42         ` Nicolas Pitre
2013-08-02 19:54           ` Jason Cooper
2013-08-02 19:57           ` Jason Cooper
2013-08-02 17:53       ` [RFC PATCH V2 0/9] impedance-matcher generic improvements Daniel Mack
2013-08-02 18:43         ` Jason Cooper
2013-08-02 18:46           ` Daniel Mack
2013-07-04 18:36 ` Appended DTB files for multi-machine kernels Dirk Behme
2013-07-04 18:36   ` Dirk Behme
2013-07-05 18:36 ` Stephen Warren
2013-07-05 18:36   ` Stephen Warren

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