From b9b4bf504c9e94fe38b93aa2784991c80cebcf2e Mon Sep 17 00:00:00 2001 From: =?utf8?q?Linus=20L=C3=BCssing?= Date: Mon, 2 Oct 2017 17:59:03 +0200 Subject: [PATCH] ARM: dts: meson8b: add reserved memory zone to fix silent freezes MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Acked-by: Martin Blumenstingl Signed-off-by: Kevin Hilman --- 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 274d5e4..bc4d4a2 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>; -- 2.7.4