nand jffs2

I am using 512MB NAND (2k Page Size). Linux version is 2.6.24. In my
board I am using NOR and NAND flash. Both are mounting as a JFFS2. NOR
was mounted when booting the system, NAND will mount after booting the
linux. After mounting NAND Flash if I run any application means linux
gets crashed. Is there any specific configuration change in NAND Flash
to work as a JFFS2 file system?
Is possible to access both NOR & NAND flash through JFFS2 driver.
Can any one help me how too fix this problem?