D40221.id122258.diff
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D40221.id122258.diff
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	diff --git a/stand/efi/libefi/eficom.c b/stand/efi/libefi/eficom.c
	--- a/stand/efi/libefi/eficom.c
	+++ b/stand/efi/libefi/eficom.c
	@@ -254,6 +254,11 @@
	return (NULL);
	}

	+/*
	+ * Called from cons_probe() to see if this device is available.
	+ * Return immediately on x86, except for hyperv, since it interferes with
	+ * common configurations otherwise (yes, this is just firewalling the bug).
	+ */
	static void
	comc_probe(struct console *sc)
	{
	@@ -265,6 +270,18 @@
	char env, buf, *ep;
	size_t sz;

	+#ifdef __amd64__
	+ /*
	+ * This driver tickles issues on a number of different firmware loads.
	+ * It is only required for HyperV, and is only known to work on HyperV,
	+ * so only allow it on HyperV.
	+ */
	+ env = getenv("smbios.bios.version");
	+ if (env == NULL \|\| strncmp(env, "Hyper-V", 7) != 0) {
	+ return;
	+ }
	+#endif
	+
	if (comc_port == NULL) {
	comc_port = calloc(1, sizeof (struct serial));
	if (comc_port == NULL)