Based on what you posted, I assume you are trying to build the nand flash image through make. If you want ot do that,
first you need to enter the shell mode. This is probably nothing but setting a few environment variables.
Anyhow
You should see
LTIB>
From here you can enter make P2020RDB_config
Btw, if you want to make a NAND boot you sholudn't be doing
make P2020RDB_config
followed by make
You should type
make P2020RDB_NAND_config
followed by
make
For more informations about available tragers please see the doc directory off your main ltib installations. Look for a file README.p1_p2****
I don't know why you installed your things off /opt, I just installed it in my home and everything works for me. I don't think where you installed it matters and issue is what I explained above probably.
Ali
One more suggestion, next time please cut and paste your error messages, that will take away of a lot of guessing and probably irrelavant answers.