Kernel Properties for Drivers                 ddi-forceattach(9P)



NAME
     ddi-forceattach, ddi-no-autodetach - properties  controlling
     driver attach/detach behavior

DESCRIPTION
     Solaris device drivers are attached by  devfsadm(1M) and  by
     the  kernel  in  response  to open(2) requests from applica-
     tions. Drivers not currently in use can be detached when the
     system  experiences memory pressure. The ddi-forceattach and
     ddi-no-autodetach properties can be used to customize driver
     attach/detach behavior.


     The ddi-forceattach is an integer property, to be  set  glo-
     bally by means of the driver.conf(4) file. Drivers with this
     property set to 1 are loaded and attached  to  all  possible
     instances  during  system  startup.  The  driver will not be
     auto-detached due to system memory pressure.


     The ddi-no-autodetach is an integer property to be set  glo-
     bally by means of the driver.conf(4) file or created dynami-
     cally  by  the  driver  on   a   per-instance   basis   with
     ddipropupdateint(9F). When this property is set to 1, the
     kernel will not auto-detach  driver  due  to  system  memory
     pressure.


     Note that ddi-forceattach implies ddi-no-autodetach. Setting
     either  property  to a non-integer value or an integer value
     not equal to 1 produces undefined results. These  properties
     do  not prevent driver detaching in response to reconfigura-
     tion  requests,  such  as  executing  commands   cfgadm(1M),
     modunload(1M), remdrv(1M), and updatedrv(1M).

SEE ALSO
     driver.conf(4)


     Writing Device Drivers















SunOS 5.11          Last change: 18 May 2001                    1