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| author | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-28 21:59:49 -0500 |
|---|---|---|
| committer | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-28 21:59:49 -0500 |
| commit | b2d60b2f32b3a8636c7db65b780ce59a211116f8 (patch) | |
| tree | f293233e5df967af5e3c9298f590fcb139d77e9e /meta-raptor | |
| parent | d3836296b82ce422140f88a481ad16f22a30bf39 (diff) | |
| download | ast2050-yocto-openbmc-b2d60b2f32b3a8636c7db65b780ce59a211116f8.zip ast2050-yocto-openbmc-b2d60b2f32b3a8636c7db65b780ce59a211116f8.tar.gz | |
Add workaround to prevent BMC timer lockup and reboot
This is a bit of a nasty hack but it works...
Diffstat (limited to 'meta-raptor')
3 files changed, 51 insertions, 0 deletions
diff --git a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/ast2050-timer-workaround.sh b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/ast2050-timer-workaround.sh new file mode 100755 index 0000000..d8631dd --- /dev/null +++ b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/ast2050-timer-workaround.sh @@ -0,0 +1,45 @@ +#/bin/bash +# +# Copyright 2017 Raptor Engineering, LLC +# +# Work around glitchy timer0 on the AST2050 +# For an unknown reason, sometimes when timer0 +# expires it does not fire an IRQ. This in turn +# causes Linux to hang waiting for the timer to +# expire, causing all nanosleep calls to stall +# indefinitely. On a stock OpenBMC system, this +# manifests as a spontanous reboot every few hours +# of uptime as the watchdog timer kicks in. +# +# This script works around the problem by watching +# timer0 and seeing if it is stuck at 0. If so, it +# gives the afflicted timer a good kick in the rear +# to get it going again, which in turn un-stalls all +# of the queued nanosleep calls. +# +# Note that due to what this does and how it operates, +# using sleep in this script is a VERY BAD IDEA! + +function daemon_process { + while [[ 1 == 1 ]]; do + TIMER_COUNT=$(devmem 0x1e782000 32) + if [[ "$TIMER_COUNT" == "0x00000000" ]]; then + TIMER_COUNT=$(devmem 0x1e782000 32) + if [[ "$TIMER_COUNT" == "0x00000000" ]]; then + echo "Kicking timer back into operation!" + devmem 0x1e782004 32 0x00000001 + fi + fi + + # Busy wait at highest niceness + COUNTER=1000 + until [[ $COUNTER -lt 1 ]]; do + let COUNTER-=1 + done + done +} + +renice -n 19 $$ + +daemon_process < /dev/null & +disown diff --git a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh index 2b2e902..1016715 100644..100755 --- a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh +++ b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl/setup-fan.sh @@ -28,6 +28,10 @@ # Short-Description: Set fan speed ### END INIT INFO +echo -n "Start AST2050 timer workaround..." +/usr/local/bin/ast2050-timer-workaround.sh > /dev/null +echo "done". + echo -n "Setup fan speed... " rmmod w83795 || true /usr/local/bin/platform_sensor_init diff --git a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl_0.1.bbappend b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl_0.1.bbappend index b6f0ae1..ae0508a 100644 --- a/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl_0.1.bbappend +++ b/meta-raptor/meta-asus/recipes-core/fan-ctrl/fan-ctrl_0.1.bbappend @@ -22,6 +22,7 @@ SRC_URI += "file://get_fan_speed.sh \ file://set_fan_speed.sh \ file://init_pwm.sh \ file://setup-fan.sh \ + file://ast2050-timer-workaround.sh \ " S = "${WORKDIR}" @@ -32,6 +33,7 @@ binfiles = " \ init_pwm.sh \ fand \ platform_sensor_init \ + ast2050-timer-workaround.sh \ " CXXFLAGS_prepend = "-DCONFIG_ASUS " |
