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-rw-r--r--hwdb.d/80-ieee1394-unit-function.hwdb5
1 files changed, 5 insertions, 0 deletions
diff --git a/hwdb.d/80-ieee1394-unit-function.hwdb b/hwdb.d/80-ieee1394-unit-function.hwdb
index dcc60fd3c8..6fa1329171 100644
--- a/hwdb.d/80-ieee1394-unit-function.hwdb
+++ b/hwdb.d/80-ieee1394-unit-function.hwdb
@@ -42,6 +42,11 @@
# * Configuration ROM for AV/C Devices 1.0 (Dec. 12, 2000, 1394 Trading Association, TA Document
# 1999027)
#
+# Exceptional layout of configuration ROM for legacy device is described in annex of the above
+# document. The layout has some entries for model information in vendor directory instead of root
+# or unit directories. For the case, Linux FireWire subsystem don't detect Model_ID and model name,
+# thus node key without 'mo' field is detected. Wild card pattern is used to match the case with and
+# without mo field in customized key for node device.
# Just for backward compatibility. Please invalidate IEEE1394_UNIT_FUNCTION_VIDEO by adding entries
# if it is inconvenient.