diff --git a/sys/dev/ioat/ioat.c b/sys/dev/ioat/ioat.c
index 1b0c381470b..6c96811cf0c 100644
--- a/sys/dev/ioat/ioat.c
+++ b/sys/dev/ioat/ioat.c
@@ -349,7 +349,8 @@ ioat_start_channel(struct ioat_softc *ioat)
 
 	chanerr = ioat_read_4(ioat, IOAT_CHANERR_OFFSET);
 	ioat_log_message(0, "could not start channel: "
-	    "status = %#jx error = %x\n", (uintmax_t)status, chanerr);
+	    "status = %#jx error = %b\n", (uintmax_t)status, (int)chanerr,
+	    IOAT_CHANERR_STR);
 	return (ENXIO);
 }
 
@@ -1105,7 +1106,8 @@ ioat_halted_debug(struct ioat_softc *ioat, uint32_t chanerr)
 {
 	struct ioat_descriptor *desc;
 
-	ioat_log_message(0, "Channel halted (%x)\n", chanerr);
+	ioat_log_message(0, "Channel halted (%b)\n", (int)chanerr,
+	    IOAT_CHANERR_STR);
 	if (chanerr == 0)
 		return;
 
diff --git a/sys/dev/ioat/ioat_hw.h b/sys/dev/ioat/ioat_hw.h
index d2bba62a6a2..b3a21cb14dc 100644
--- a/sys/dev/ioat/ioat_hw.h
+++ b/sys/dev/ioat/ioat_hw.h
@@ -126,6 +126,13 @@ __FBSDID("$FreeBSD$");
 #define	IOAT_CHANERR_RATVERR		(1 << 26)
 #define	IOAT_CHANERR_RRTVERR		(1 << 27)
 
+#define	IOAT_CHANERR_STR \
+    "\20\34RRTVERR\33RATVERR\32RGTVERR\31RDIFFERR\30BBERR\27RTVERR\26ATVERR" \
+    "\25GTVERR\24DIFFERR\23DCNTERR\21CXPERR\20UNAFFERR\17SEDERR\16INTCFGERR" \
+    "\15CMPADDERR\14DXSERR\13DCERR\12WDERR\11RDERR\10DUNCORERR\07CUNCORERR" \
+    "\06CCMDERR\05CHADDERR\04DERR\03NDADDERR\02XDADDERR\01XSADDERR"
+
+
 #define	IOAT_CFG_CHANERR_INT_OFFSET		0x180
 #define	IOAT_CFG_CHANERRMASK_INT_OFFSET		0x184