Here are the simple guide on how to reset the RSC thru the OS.
Try to check if the RSC is still responding:
root@solaris# /usr/platform/`uname -i`/rsc/rscadm shownetwork
rscadm: RSC firmware not responding~
To perform soft reset:
root@solaris# /usr/platform/`uname -i`/rsc/rscadm resetrsc -s
Are you sure you want to reboot RSC (y/n)? y
rscadm: RSC firmware not responding
If it still not help, perform a hard reset on the RSC: