How to partition NAND flash

Hi,

I'm trying to get a 64 MByte nand flash to be partitioned in a 32MB cramfs and 32MB jffs2 partition.

I tried to do this in the kernel by

static struct mtd_partition partition_info[] = {
        [0] = {
                .name   = "CRAM",
                .offset = 0,
                .size   = 32 * 1024 * 1024,
                .mask_flags     = MTD_WRITEABLE,  /* force read-only */
        },
    [1] = {
                .name   = "JFFS2",
                .offset = 32 * 1024 * 1024,
                .size   = MTDPART_SIZ_FULL,
    }
};

but when I cat/proc/mtd, I get
/ # cat /proc/mtd
dev: size erasesize name
mtd0: 04000000 00004000 "rootfs"

so I realise that this is affected by the bootargs passed which is "console=ttyS0 mtdparts=a9m9750:0x4000000@0(rootfs) root=mtdblock/0 rootfstype=jffs2"

How should I passed the bootargs?

Thanks in advance,
Terence.