ieee1394: sbp2: more help in Kconfig

Add some pointers to SCSI to the configuration menu item of sbp2.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/ieee1394/Kconfig

@@ -120,12 +120,19 @@ config IEEE1394_VIDEO1394
 	  this option only if you have an IEEE 1394 video device connected to
 	  an OHCI-1394 card.
 
+comment "SBP-2 support (for storage devices) requires SCSI"
+	depends on IEEE1394 && SCSI=n
+
 config IEEE1394_SBP2
 	tristate "SBP-2 support (Harddisks etc.)"
 	depends on IEEE1394 && SCSI && (PCI || BROKEN)
 	help
-	  This option enables you to use SBP-2 devices connected to your IEEE
-	  1394 bus.  SBP-2 devices include harddrives and DVD devices.
+	  This option enables you to use SBP-2 devices connected to an IEEE
+	  1394 bus.  SBP-2 devices include storage devices like harddisks and
+	  DVD drives, also some other FireWire devices like scanners.
+
+	  You should also enable support for disks, CD-ROMs, etc. in the SCSI
+	  configuration section.
 
 config IEEE1394_SBP2_PHYS_DMA
 	bool "Enable replacement for physical DMA in SBP2"