[OpenWrt-Devel] [LEDE-DEV] [PATCH] mvebu: disable CPU_IDLE as a Mamba instability workaround

Bjørn Mork bjorn at mork.no
Mon Mar 19 17:47:00 EDT 2018

Felix Fietkau <nbd at nbd.name> writes:

> On 2018-03-19 10:51, Bjørn Mork wrote:
>> A regression seriously affecting the Linksys WRT1900ACv1 (Mamba) was
>> introduced some time between the OpenWrti/LEDE v4.4 and v4.9 kernels.
>> The root cause has not yet been identified, despite many attempts for
>> more than a year.  However, disabling CPU_IDLE, and implicitly CPU_PM,
>> has been proven to be an effective workaround.
>> The symptoms on an affected system are unwanted reboots a a variable
>> frequency. In many cases almost immediately after boot, causing a
>> bootloop.  This effectively disables support for Mamba on OpenWrt
>> with kernels > v4.4.
>> Disabling CPU_IDLE for now to reenable Mamba support.
>> Link: https://forum.lede-project.org/t/wrt1900acv1-reboots-kernel-4-9/2025
>> Signed-off-by: Bjørn Mork <bjorn at mork.no>
> Please try this variant instead, which should not affect unrelated devices:
> https://git.openwrt.org/0142d447bc02922369c363de6510e76848943e9a
> It's in my staging tree at
> https://git.openwrt.org/?p=openwrt/staging/nbd.git;a=summary

Works for me.  Thanks.  Much better solution.

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