command_line_parameters

Official reference

• ccw_timeout_log

  Enable logging of debug information in case of ccw device timeouts.

• cio_ignore = device[,device[,..]]

  device := {all

  [!]ipldev

  [!]condev

  [!]

  [!]-}

  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 which the device in question is attached will be treated as if no device was attached.

  An ignored device can be un-ignored later; see the “/proc entries”-section for details.

  The devices must be given either as bus ids (0.x.abcd) or as hexadecimal 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 ‘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::

  cio_ignore=0.0.0023-0.0.0042,0.0.4711

  will ignore all devices ranging from 0.0.0023 to 0.0.0042 and the device 0.0.4711, if detected.

  As another example::

  cio_ignore=all,!0.0.4711,!0.0.fd00-0.0.fd02

  will ignore all devices but 0.0.4711, 0.0.fd00, 0.0.fd01, 0.0.fd02.

  By default, no devices are ignored.