I use the code of VT8623 to active DDR RAM, but only BANK 0 is working
epia-m doesn't configure the ddr automatically yet. Doubtful whether version 1 will ever have it. Version 2 one day will...
I hacked freebios version 1 to configure 2 banks by adding a loop. You can probably adapt this code to your needs. http://www.xdr.com/dash/linuxbios
-Dave