ddi-forceattach(9P)					   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 applications. Drivers not cur-
       rently 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 globally 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 globally by means of the driver.conf(4) file or created dynamically by the driver on
       a  per-instance	basis  with  ddi_prop_update_int(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 pro-
       duces  undefined  results. These properties do not prevent driver detaching in response to reconfiguration requests, such as executing com-
       mands cfgadm(1M), modunload(1M), rem_drv(1M), and update_drv(1M).

SEE ALSO

       driver.conf(4)

       Writing Device Drivers

SunOS 5.10							    18 May 2001 					       ddi-forceattach(9P)