D15520.id42843.diff
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D15520.id42843.diff
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	Index: head/sys/dev/cpuctl/cpuctl.c
	===================================================================
	--- head/sys/dev/cpuctl/cpuctl.c
	+++ head/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);