Box: SPARC-Enterprise-T5220
1. svcadm disable ldmd
2. pkgrm SUNWldm SUNWjass
3. install LDom1.1
4. reboot os.
I made a mistake here, in step 2, I also removed both SUNWldomr and SUNWldomu packages, ldmd can not be started cause after OS reboot, I got the fatal error:
fatal error: No such file or directory: Unable to open VLDC instance /devices/virtual-devices@100/channel-devices@200/virtual-channel@0:hvctl for contacting hypervisor
To solve this issue, just add SUNWldomr.v and SUNWldomu.v packages and reboot the OS, then everything goes well.