hiho,
if you are using solaris 8 or earlier use Perderabos answere, drvconfig;

if you are using solaris 9 you could use devfsadm

# man devfsadm

DESCRIPTION
devfsadm(1M) maintains the /dev and /devices namespaces. It replaces the previous suite of devfs administration tools including drvconfig(1M), disks(1M), tapes(1M), ports(1M), audlinks(1M), and devlinks(1M).

The default operation is to attempt to load every driver in the system and attach to all possible device instances.
devfsadm then creates device special files in /devices and logical links in /dev.

*The official procedure is to do a reconfiguration reboot.*
sorry, that's not my opinion, solaris is using an full dynamic kernel (that's no bug, that's a feature!) and full reconfigureable processes.
# man path_to_inst
This file is read only at boot time, and is updated by add_drv(1M), devfsadm(1M) and drvconfig(1M)

be happy using an windowless OS... suns big maschines are also able to rebind whole processor boards without an reboot.. Downtime costs money!

greetings Preßy