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

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Date:	Thu, 26 Feb 2015 14:49:58 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	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>
Cc:	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Pavel Machek <pavel@....cz>, Nishanth Menon <nm@...com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Sebastian Reichel <sre@...nel.org>,
	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH 08/10] ARM: dts: n900: Enable omap sham and include directly omap34xx.dtsi

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>
---
 arch/arm/boot/dts/omap3-n900.dts |   16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index d16aa9c..10d5305 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -9,9 +9,23 @@
 
 /dts-v1/;
 
-#include "omap34xx-hs.dtsi"
+#include "omap34xx.dtsi"
 #include <dt-bindings/input/input.h>
 
+/*
+ * 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
+ * blocks then kernel receive "Unhandled fault: external abort on non-linefetch"
+ * and crash. Until somebody fix omap-aes.c and omap_hwmod_3xxx_data.c code (no
+ * 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
+ * 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";
-- 
1.7.9.5

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