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 pres‐
sure. 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 prop‐
erty 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 detach‐
ing in response to reconfiguration requests, such as executing commands
cfgadm(1M), modunload(1M), rem_drv(1M), and update_drv(1M).
SEE ALSOdriver.conf(4)
Writing Device Drivers
SunOS 5.11 18 May 2001 ddi-forceattach(9P)