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

Zoltan HERPAI wigyori at uid0.hu
Tue Mar 20 05:03:08 EDT 2018

Bjørn Mork wrote:
> 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.
Confirmed fixing the reboot problem on another Mamba.

Zoltan H
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