From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?q?Linus=20L=C3=BCssing?= Subject: [PATCH] ARM: dts: meson8b: add reserved memory zone to fix silent freezes Date: Mon, 2 Oct 2017 17:59:03 +0200 Message-ID: <20171002155903.19511-1-linus.luessing@c0d3.blue> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Return-path: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-amlogic-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Carlo Caione , Martin Blumenstingl , Mark Rutland , Rob Herring , Russell King , Kevin Hilman , =?UTF-8?q?Linus=20L=C3=BCssing?= List-Id: devicetree@vger.kernel.org So far, the stress-ng tool for instance quickly resulted in a silent freeze of the system with no prior notice on a serial console when running its filesystem or memory stressor classes. Even with a panic-on-OOM and reboot-on-panic (vm.panic_on_oom=1, kernel.panic=10) configured, the system would neither reboot nor would the OOM killer get any chance to otherwise do its job. The Amlogic reference source code uses a 2MB PHYS_OFFSET. With these 2MB reserved via DT, stress-ng was able to run on an Odroid C1+ just fine for several hours, the OOM killer was able to kill processes again and if configured would successfully trigger a reboot of the system. Fixes: 4a69fcd3a108 ("ARM: meson: Add DTS for Odroid-C1 and Tronfy MXQ boards") Signed-off-by: Linus Lüssing --- The following stress-ng command worked fine now: $ stress-ng -v --sequential 0 -t 120s --exclude sysfs,opcode --metrics (5 hours runtime, tested on an Odroid C1+ with an 4.14-rc1 kernel + SMP + USB DTS patches) --- arch/arm/boot/dts/meson8b.dtsi | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/arm/boot/dts/meson8b.dtsi b/arch/arm/boot/dts/meson8b.dtsi index bc278da..d75a5b5 100644 --- a/arch/arm/boot/dts/meson8b.dtsi +++ b/arch/arm/boot/dts/meson8b.dtsi @@ -83,6 +83,18 @@ }; }; + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + /* 2 MiB reserved for Hardware ROM Firmware? */ + hwrom@0 { + reg = <0x0 0x200000>; + no-map; + }; + }; + scu@c4300000 { compatible = "arm,cortex-a5-scu"; reg = <0xc4300000 0x100>; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html