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@xxxxxxxxx>
---
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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