Kernel panic on mount rootfs

rootfs_qtopia_qt4.img : kernel can mount rootfs successfully.
rootfs_qtopia-64M.img : kernel can't mount rootfs successfully. error is
below

yaffs_read_super: isCheckpointed 0
VFS: Mounted root (yaffs filesystem) on device 31:3.
Freeing init memory: 192K
Warning: unable to open an initial console.
Failed to execute /linuxrc.  Attempting defaults...
Kernel panic - not syncing: No init found.  Try passing init= option to
kernel.
Backtrace:
[<c003d240>] (dump_backtrace+0x0/0x108) from [<c03283ec>]
(dump_stack+0x18/0x1c)
 r6:c044545c r5:c0444bd4 r4:c041a22c
[<c03283d4>] (dump_stack+0x0/0x1c) from [<c0328430>] (panic+0x40/0x134)
[<c03283f0>] (panic+0x0/0x134) from [<c00385c8>] (init_post+0xf0/0x180)
 r3:c383dd00 r2:c383de00 r1:c047a000 r0:c03b451c
[<c00384d8>] (init_post+0x0/0x180) from [<c00084c4>]
(kernel_init+0xf4/0x124)
 r5:c0020330 r4:c0020330
[<c00083d0>] (kernel_init+0x0/0x124) from [<c0055388>] (do_exit+0x0/0x628)
 r6:00000000 r5:00000000 r4:00000000

what is different between rootfs_qtopia_qt4.img and rootfs_qtopia-64M.img?
rootfs_qtopia-64M.img can use with mini2440+LCDN35. and
rootfs_qtopia_qt4.img can use with mini2440+LCDW35. There are same kernel.

I suppose, that the difference is in NAND module. Maybe 64MB NAND has
different pagesize or something else. 
Try to repack image with jssf2 tools