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Index: sys/dev/cpuctl/cpuctl.c
===================================================================
--- sys/dev/cpuctl/cpuctl.c
+++ sys/dev/cpuctl/cpuctl.c
@@ -367,8 +367,10 @@
rdmsr_safe(MSR_BIOS_SIGN, &rev0); /* Get current microcode revision. */
/*
- * Perform update.
+ * Perform update. Flush caches first to work around seeingly
+ * undocumented errata applying to some Broadwell CPUs.
*/
+ wbinvd();
wrmsr_safe(MSR_BIOS_UPDT_TRIG, (uintptr_t)(ptr));
wrmsr_safe(MSR_BIOS_SIGN, 0);

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