linux-kernel - Re: [PATCH 08/10] ARM: dts: n900: Enable omap sham and include directly omap34xx.dtsi

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Date:	Sat, 28 Feb 2015 17:44:13 +0100
From:	Pavel Machek <pavel@....cz>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Paul Walmsley <paul@...an.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Nishanth Menon <nm@...com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH 08/10] ARM: dts: n900: Enable omap sham and include
 directly omap34xx.dtsi

On Thu 2015-02-26 14:49:58, Pali Rohár wrote:
> This patch moves content of file omap34xx-hs.dtsi into omap3-n900.dts and enable
> omap sham support (omap HW support for SHA + MD5). After testing both omap hwmod
> and omap-sham.ko drivers it looks like signed Nokia X-Loader enable L3 firewall
> for omap sham. There is no kernel crash with both official bootloader and crypto
> enable bootloader. So we can safely enable sham code.
> 

> Signed-off-by: Pali Rohár <pali.rohar@...il.com>

Acked-by: Pavel	 Machek <pavel@....cz>


> +/*
> + * Default secure signed bootloader (Nokia X-Loader) does not enable L3 firewall
> + * for omap AES HW crypto support. When linux kernel try to access memory of AES

                                      When Linux Kernel tries...

> + * blocks then kernel receive "Unhandled fault: external abort on non-linefetch"
            , the kernel receives
	    
> + * and crash. Until somebody fix omap-aes.c and omap_hwmod_3xxx_data.c code (no

      and crashes. Until somebody fixes
      
> + * crash anymore) omap AES support will be disabled for all Nokia N900 devices.
> + * There is "unofficial" version of bootloader which enables AES in L3 firewall
                                                                          firewall,
									  
> + * but it is not widely used and to prevent kernel crash rather AES is disabled.
> + * There is also no runtime detection code if AES is disabled in L3 firewall...
> + */
> +&aes {
> +	status = "disabled";
> +};
> +
>  / {
>  	model = "Nokia N900";
>  	compatible = "nokia,omap3-n900", "ti,omap3430", "ti,omap3";

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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