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

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Message-id: <alpine.LFD.2.02.1110141549160.17040@xanadu.home>
Date:	Fri, 14 Oct 2011 16:06:21 -0400 (EDT)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
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, 14 Oct 2011, Russell King - ARM Linux wrote:

> But... one thing to note is that it _is_ common to load the decompressor
> at a _different_ address to that where the kernel ultimately ends up
> residing to avoid the additional copy in the decompressor.  My experience
> shows that this is quite common on the platforms I had supplied.  This
> means that if we default to AUTO_ZRELADDR for !ZBOOT_ROM, we end up
> having to have developers change their uboot setups to avoid unexpected
> results.

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.

Nicolas
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