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 <bj...@mork.no> --- target/linux/mvebu/config-4.14 | 4 ---- 1 file changed, 4 deletions(-) diff --git a/target/linux/mvebu/config-4.14 b/target/linux/mvebu/config-4.14 index 5286bf9b8314..78bed5b32f7b 100644 --- a/target/linux/mvebu/config-4.14 +++ b/target/linux/mvebu/config-4.14 @@ -54,7 +54,6 @@ CONFIG_ARM_HEAVY_MB=y CONFIG_ARM_L1_CACHE_SHIFT=6 CONFIG_ARM_L1_CACHE_SHIFT_6=y # CONFIG_ARM_LPAE is not set -CONFIG_ARM_MVEBU_V7_CPUIDLE=y CONFIG_ARM_PATCH_IDIV=y CONFIG_ARM_PATCH_PHYS_VIRT=y CONFIG_ARM_THUMB=y @@ -103,11 +102,8 @@ CONFIG_CPU_FREQ_STAT=y CONFIG_CPU_HAS_ASID=y # CONFIG_CPU_HOTPLUG_STATE_CONTROL is not set # CONFIG_CPU_ICACHE_DISABLE is not set -CONFIG_CPU_IDLE=y -CONFIG_CPU_IDLE_GOV_LADDER=y CONFIG_CPU_PABRT_V7=y CONFIG_CPU_PJ4B=y -CONFIG_CPU_PM=y CONFIG_CPU_RMAP=y CONFIG_CPU_THERMAL=y CONFIG_CPU_THUMB_CAPABLE=y -- 2.11.0 _______________________________________________ Lede-dev mailing list Lede-dev@lists.infradead.org http://lists.infradead.org/mailman/listinfo/lede-dev
