linux-kernel - Re: [PATCH] ARM: /proc/atags: Export also for DT

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Message-Id: <201501281438.46942@pali>
Date:	Wed, 28 Jan 2015 14:38:46 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Nicolas Pitre <nico@...xnic.net>
Cc:	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Rob Herring <robherring2@...il.com>,
	Pavel Machek <pavel@....cz>, Will Deacon <will.deacon@....com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] ARM: /proc/atags: Export also for DT

On Wednesday 28 January 2015 03:07:43 Nicolas Pitre wrote:
> In other words, what prevents someone from creating, say, a
> custom minimal Barebox version that sits on top of the
> existing N900 bootloader?  Wouldn't that provide a much
> better user experience?
> 

Strong cryptography used for signing first stage bootloader, 
undocumented interface and other stuff which initialize HW and 
small memory (about 100kB) for second stage non-signed 
bootloader. Next kernel image is limited to size 2MB. And 
currently uboot can be compiled to act as "kernel" image, so 
second stage bootloader can boot it.

I spend some time to replace second (non signed) bootloader with 
something other, but really it is not possible.

-- 
Pali Rohár
pali.rohar@...il.com

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