Hi,
I'm trying to get kexec to work consistently for ipq4019. I load
the crash kernel like this:
kexec --type zImage -p zImage-initramfs
--dtb=image-qcom-ipq4019-eap1300.dtb --append="maxcpus=1
reset_devices" --image-size=34419456
I have reserved 64MB of memory for the crash kernel with parameter:
crashkernel=64M
This seems to work ~70% of the time. When it doesn't work, I see the
"bye!" message followed by a 5-10 second hang without output. Then
the machine resets.
I've been testing with:
echo c > /proc/sysrq-trigger
Does anyone have an idea of what may be causing the failures or how
to troubleshoot this?
I'm using OpenWRT with kernel 4.14.37. I added the following patch
in order to load the crash kernel:
--- a/arch/arm/mach-qcom/platsmp.c
+++ b/arch/arm/mach-qcom/platsmp.c
@@ -332,6 +332,12 @@ static void __init qcom_smp_prepare_cpus
}
}
+/* Needed by kexec and platform_can_cpu_hotplug() */
+int qcom_cpu_kill(unsigned int cpu)
+{
+ return 1;
+}
+
static const struct smp_operations smp_msm8660_ops __initconst = {
.smp_prepare_cpus = qcom_smp_prepare_cpus,
.smp_secondary_init = qcom_secondary_init,
@@ -358,6 +364,7 @@ static const struct smp_operations qcom_
.smp_boot_secondary = kpssv2_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = qcom_cpu_die,
+ .cpu_kill = qcom_cpu_kill,
#endif
};
CPU_METHOD_OF_DECLARE(qcom_smp_kpssv2, "qcom,kpss-acc-v2",
&qcom_smp_kpssv2_ops);
Thanks,
Andy
--
http://www.uplevelsystems.com <http://www.uplevelsystems.com>
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