diff --git a/sys/arch/sparc64/conf/GENERIC32 b/sys/arch/sparc64/conf/GENERIC32
index 212c6b81902f..83725660ad7e 100644
--- a/sys/arch/sparc64/conf/GENERIC32
+++ b/sys/arch/sparc64/conf/GENERIC32
@@ -1,10 +1,10 @@
-# 	$NetBSD: GENERIC32,v 1.51 2002/10/14 18:39:40 elric Exp $
+# 	$NetBSD: GENERIC32,v 1.52 2002/10/18 01:54:15 grant Exp $
 
 include "arch/sparc64/conf/std.sparc64"
 
 options 	INCLUDE_CONFIG_FILE	# embed config file in kernel binary
 
-#ident 		"GENERIC-$Revision: 1.51 $"
+#ident 		"GENERIC-$Revision: 1.52 $"
 
 maxusers	64
 
@@ -304,15 +304,30 @@ ss*	at scsibus? target ? lun ?		# SCSI scanners
 ses*	at scsibus? target ? lun ?		# SCSI SES/SAF-TE devices
 uk*	at scsibus? target ? lun ?		# unknown SCSI
 
-# PCI IDE.
-pciide* at pci ? dev ? function ? flags 0x0000
+# IDE and related devices
+# PCI IDE controllers - see pciide(4) for supported hardware.
+# The 0x0001 flag force the driver to use DMA, even if the driver doesn't know
+# how to set up DMA modes for this chip. This may work, or may cause
+# a machine hang with some controllers.
+pciide* at pci? dev ? function ? flags 0x0000
 atapibus* at pciide? channel ?
 
+# IDE drives
+# Flags are used only with controllers that support DMA operations
+# and mode settings (e.g. some pciide controllers)
+# The lowest order four bits (rightmost digit) of the flags define the PIO
+# mode to use, the next set of four bits the DMA mode and the third set the
+# UltraDMA mode. For each set of four bits, the 3 lower bits define the mode
+# to use, and the last bit must be 1 for this setting to be used.
+# For DMA and UDMA, 0xf (1111) means 'disable'.
+# 0x0fac means 'use PIO mode 4, DMA mode 2, disable UltraDMA'.
+# (0xc=1100, 0xa=1010, 0xf=1111)
+# 0x0000 means "use whatever the drive claims to support".
+
 ## Disable UDMA 4 which causes data corruption on the Acer Labs
 ## chipset on Sun Blade 100 and Netra X1 machines.
 wd*	at pciide? channel ? drive ? flags 0x0a00 # Disable UDMA 4
 
-
 cd*	at atapibus? drive ? flags 0x0000	# ATAPI CD-ROM drives
 sd*	at atapibus? drive ? flags 0x0000	# ATAPI disk drives
 uk*	at atapibus? drive ? flags 0x0000	# ATAPI unknown