[PATCH] ARM: dts: meson8b: add reserved memory zone to fix silent freezes
From: martin.blumenstingl@googlemail.com (Martin Blumenstingl)
Date: 2017-10-02 18:39:53
Also in:
linux-amlogic, linux-devicetree, lkml
On Mon, Oct 2, 2017 at 5:59 PM, Linus L?ssing [off-list ref] wrote:
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 L?ssing <redacted>Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
quoted hunk ↗ jump to hunk
--- 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 at 0 { + reg = <0x0 0x200000>; + no-map; + }; + }; + scu at c4300000 { compatible = "arm,cortex-a5-scu"; reg = <0xc4300000 0x100>; --2.1.4