linux-kernel - Re: [PATCH] arm/tegra: select AUTO

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Message-ID: <20111014201223.GV21648@n2100.arm.linux.org.uk>
Date:	Fri, 14 Oct 2011 21:12:23 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Nicolas Pitre <nico@...xnic.net>
Cc:	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Stephen Warren <swarren@...dia.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"Colin Cross (ccross@...roid.com)" <ccross@...roid.com>,
	Erik Gilling <konkers@...roid.com>
Subject: Re: [PATCH] arm/tegra: select AUTO_ZRELADDR by default

On Fri, Oct 14, 2011 at 04:06:21PM -0400, Nicolas Pitre wrote:
> Currently, U-Boot insists on having a uImage with a fixed absolute load 
> address.  This is currently provided by the zreladdr value, whether or 
> not AUTO_ZRELADDR is set.  I consider this as a persisting uImage 
> limitation.
> 
> Either u-Boot gets fixed so it can work with plain zImage (and this 
> certainly will happen once the pressure from people wanting a single 
> kernel to work on targets with different load addresses increase.  
> Tegra is one such example.
> 
> Or we create a u-Boot specific Kconfig menu for uImage options that 
> would be common to all architectures and kick it out from the ARM 
> specific makefile.  This is not solving the u-Boot limitation though.
> 
> In either cases this is a u-Boot problem that needs fixing on the u-Boot 
> side in the end.

I don't think that's so with the various flavours of platform specific
uboot which float around.  For instance, on the OMAP4430 SDP, the
following commands were used as supplied to load a uImage off the SD
card into RAM at a different address to which it was built for, and
execute it at that address:

mmcinit 0
fatload mmc 0 0x80300000 uImage
bootm 80300000

Whether the 'bootm' command then copied the image and called it there,
or whether it executed it at 0x80300000 I've no idea - but why then
load the image at a different address in the first place?
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