NAND flash ST NAND16GW3C4A not properly supported

In my custom board with AVR32 I'm using at the moment a NAND flash ST NAND16GW3C4A (http://www.stmicroelectronics.com/stonline/products/literature/ds/13631/nand16gw3c4a.pdf)
that is internally built as to 1G nand flash integrated, with 2 enable pins and 2 ready/busy pins. The nand driver at moment present in avr32-linux branch does not forseen more nand devices in a single chip. How is it possible to manage it with the current driver? I have to use it as two 1G partitions?
Any suggestions?

Thanks in advance Jaws