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-rw-r--r--Documentation/s390/CommonIO12
1 files changed, 7 insertions, 5 deletions
diff --git a/Documentation/s390/CommonIO b/Documentation/s390/CommonIO
index d378cba66456..6e0f63f343b4 100644
--- a/Documentation/s390/CommonIO
+++ b/Documentation/s390/CommonIO
@@ -8,9 +8,9 @@ Command line parameters
Enable logging of debug information in case of ccw device timeouts.
-* cio_ignore = {all} |
- {<device> | <range of devices>} |
- {!<device> | !<range of devices>}
+* cio_ignore = device[,device[,..]]
+
+ device := {all | [!]ipldev | [!]condev | [!]<devno> | [!]<devno>-<devno>}
The given devices will be ignored by the common I/O-layer; no detection
and device sensing will be done on any of those devices. The subchannel to
@@ -24,8 +24,10 @@ Command line parameters
device numbers (0xabcd or abcd, for 2.4 backward compatibility). If you
give a device number 0xabcd, it will be interpreted as 0.0.abcd.
- You can use the 'all' keyword to ignore all devices.
- The '!' operator will cause the I/O-layer to _not_ ignore a device.
+ You can use the 'all' keyword to ignore all devices. The 'ipldev' and 'condev'
+ keywords can be used to refer to the CCW based boot device and CCW console
+ device respectively (these are probably useful only when combined with the '!'
+ operator). The '!' operator will cause the I/O-layer to _not_ ignore a device.
The command line is parsed from left to right.
For example,