SUN: E10K DR Problem/Resolution
Standard disclaimer: use the information that follows at your own risk. If you screw up a system, don't blame it on me...
If dynamic reconfiguration isn't working, there are a number of things to check:
Is dr-max-mem enabled in OBP (=1 for Solaris 2.6; check the text for Solaris 2.5)
Ensure that dr shows up in /etc/name_to_major once and only once.
Ensure that dr shows up in /etc/name_to_major once and only once.
Execute modinfo and look for the dr driver. Execute modload /platform/sun4u1/kernel/drv/dr if it's not there.
Ensure all appropriate patches are installed.
Check if /devices/pseudo/dr@0:0 exists. If not, execute drvconfig -i dr to create it.
Ensure that /dev/dr exists and is linked to /devices/pseudo/dr@0:0