From e82165207d24ba835f93b6863c27dd4c9b50551c Mon Sep 17 00:00:00 2001
From: avg <avg@FreeBSD.org>
Date: Wed, 14 Dec 2016 16:30:53 +0000
Subject: MFC r309092: fwohci: report whether PhysicalUpperBound register is
 implemented

---
 sys/dev/firewire/fwohci.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sys/dev/firewire/fwohci.c b/sys/dev/firewire/fwohci.c
index ae753d5..a898e08 100644
--- a/sys/dev/firewire/fwohci.c
+++ b/sys/dev/firewire/fwohci.c
@@ -1874,6 +1874,16 @@ fwohci_intr_core(struct fwohci_softc *sc, uint32_t stat, int count)
 			OWRITE(sc, OHCI_PREQLO, 0xffffffff);
 			/* 0 to 4GB region */
 			OWRITE(sc, OHCI_PREQUPPER, 0x10000);
+			if (OREAD(sc, OHCI_PREQUPPER) !=
+			    (prequpper & 0xffffffff)) {
+				device_printf(fc->dev,
+				   "PhysicalUpperBound register is not "
+				   "implemented.  Physical memory access "
+				   "is limited to the first 4GB\n");
+				device_printf(fc->dev,
+				   "PhysicalUpperBound = 0x%08x\n",
+				    OREAD(sc, OHCI_PREQUPPER));
+			}
 		}
 		/* Set ATRetries register */
 		OWRITE(sc, OHCI_ATRETRY, 1<<(13+16) | 0xfff);
-- 
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