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From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: Russell King - ARM Linux <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>
Cc: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>,
	Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Subject: Re: [RFC PATCH 0/3] ARM: uncompress.h multi-platform enablement
Date: Wed, 26 Sep 2012 12:05:01 +0000	[thread overview]
Message-ID: <201209261205.01351.arnd@arndb.de> (raw)
In-Reply-To: <20120926104421.GA7040-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>

On Wednesday 26 September 2012, Russell King - ARM Linux wrote:
> That rubbishes the idea of a single kernel though, which is to give
> distros a single kernel image that they can boot on different ARM
> platforms.
> 
> They want a single kernel binary that works everywhere, not one which
> they need to select the right binary to work on platform X.  Yes, the
> internal uncompressed bulk may be the same, but it would require
> distros to carry around N different kernel images for N different
> platforms.

Right. It still helps the distros ensure that they only have a single
configuration and a single binary to test, which I expect is their main
interest, but keeping multiple copies of the same binary with different
headers is a bit silly, I agree.

On PowerPC, we have a similar problem, and the way that distros usually
deal with that is to do the final link of the zImage from the post-install
stage of their rpm or deb packages, depending on the platform they are
on. In the same stage, they also link in the newly created initrd and
the device tree blob if necessary.

	Arnd

WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 0/3] ARM: uncompress.h multi-platform enablement
Date: Wed, 26 Sep 2012 12:05:01 +0000	[thread overview]
Message-ID: <201209261205.01351.arnd@arndb.de> (raw)
In-Reply-To: <20120926104421.GA7040@n2100.arm.linux.org.uk>

On Wednesday 26 September 2012, Russell King - ARM Linux wrote:
> That rubbishes the idea of a single kernel though, which is to give
> distros a single kernel image that they can boot on different ARM
> platforms.
> 
> They want a single kernel binary that works everywhere, not one which
> they need to select the right binary to work on platform X.  Yes, the
> internal uncompressed bulk may be the same, but it would require
> distros to carry around N different kernel images for N different
> platforms.

Right. It still helps the distros ensure that they only have a single
configuration and a single binary to test, which I expect is their main
interest, but keeping multiple copies of the same binary with different
headers is a bit silly, I agree.

On PowerPC, we have a similar problem, and the way that distros usually
deal with that is to do the final link of the zImage from the post-install
stage of their rpm or deb packages, depending on the platform they are
on. In the same stage, they also link in the newly created initrd and
the device tree blob if necessary.

	Arnd

  parent reply	other threads:[~2012-09-26 12:05 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-25 22:46 [RFC PATCH 0/3] ARM: uncompress.h multi-platform enablement Stephen Warren
2012-09-25 22:46 ` Stephen Warren
     [not found] ` <1348613212-21897-1-git-send-email-swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-09-25 22:46   ` [RFC PATCH 1/3] ARM: move ICEDCC uncompress.h to common location Stephen Warren
2012-09-25 22:46     ` Stephen Warren
     [not found]     ` <1348613212-21897-2-git-send-email-swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-09-26 21:56       ` Domenico Andreoli
2012-09-26 21:56         ` Domenico Andreoli
2012-09-27  5:19         ` Stephen Warren
2012-09-27  5:19           ` Stephen Warren
2012-09-25 22:46   ` [RFC PATCH 2/3] ARM: mvebu: restore uncompress.h Stephen Warren
2012-09-25 22:46     ` Stephen Warren
2012-09-25 22:46   ` [RFC PATCH 3/3] ARM: tegra: move debug macros to include/debug Stephen Warren
2012-09-25 22:46     ` Stephen Warren
2012-09-26 10:38   ` [RFC PATCH 0/3] ARM: uncompress.h multi-platform enablement Arnd Bergmann
2012-09-26 10:38     ` Arnd Bergmann
     [not found]     ` <201209261038.36223.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-26 10:44       ` Russell King - ARM Linux
2012-09-26 10:44         ` Russell King - ARM Linux
     [not found]         ` <20120926104421.GA7040-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-09-26 12:05           ` Arnd Bergmann [this message]
2012-09-26 12:05             ` Arnd Bergmann
     [not found]             ` <201209261205.01351.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-26 13:10               ` Domenico Andreoli
2012-09-26 13:10                 ` Domenico Andreoli
2012-09-26 13:48           ` Tim Bird
2012-09-26 13:48             ` Tim Bird
     [not found]             ` <506307A0.7010701-mEdOJwZ7QcZBDgjK7y7TUQ@public.gmane.org>
2012-09-26 14:17               ` Arnd Bergmann
2012-09-26 14:17                 ` Arnd Bergmann
     [not found]                 ` <201209261417.18883.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-26 14:48                   ` Tim Bird
2012-09-26 14:48                     ` Tim Bird
     [not found]                     ` <506315A6.3090300-mEdOJwZ7QcZBDgjK7y7TUQ@public.gmane.org>
2012-09-26 14:49                       ` Arnd Bergmann
2012-09-26 14:49                         ` Arnd Bergmann
     [not found]                         ` <201209261449.48468.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-26 15:10                           ` Russell King - ARM Linux
2012-09-26 15:10                             ` Russell King - ARM Linux
     [not found]                             ` <20120926151023.GC30938-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-09-26 15:34                               ` Stephen Warren
2012-09-26 15:34                                 ` Stephen Warren
     [not found]                                 ` <50632096.7080208-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-09-28  3:53                                   ` Nicolas Pitre
2012-09-28  3:53                                     ` Nicolas Pitre
2012-09-27  5:37 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-27  5:37   ` Jean-Christophe PLAGNIOL-VILLARD

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