A20 linux 系统分区问题

请教一下大家，
使用A20，使用NAND flash （512M 和 1G都试过）,用LinuxBSP包编译一个linux系统。大小是53.5M
使用Phoenixsuit工具烧录系统。系统跑起来后，用df -h 查看了下
# df -h
Filesystem                Size      Used Available Use% Mounted on
none                    411.2M         0    411.2M   0% /dev
/dev/nandd               33.7M     30.8M      1.2M  96% /    --》》这系统分区怎么只有33.7M
tmpfs                   413.4M     60.0K    413.3M   0% /tmp
none                    411.2M         0    411.2M   0% /dev
/dev/nanda              127.7M      5.8M    121.9M   5% /boot


用fdisk -l 查看：
# fdisk -l

Disk /dev/nanda: 33 MB, 33554432 bytes
255 heads, 63 sectors/track, 4 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

     Device Boot      Start         End      Blocks  Id System

Disk /dev/nandb: 16 MB, 16777216 bytes
255 heads, 63 sectors/track, 2 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/nandb doesn't contain a valid partition table

Disk /dev/nandc: 16 MB, 16777216 bytes
255 heads, 63 sectors/track, 2 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/nandc doesn't contain a valid partition table

Disk /dev/nandd: 134 MB, 134217728 bytes
255 heads, 63 sectors/track, 16 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/nandd doesn't contain a valid partition table

Disk /dev/nande: 238 MB, 238026752 bytes
255 heads, 63 sectors/track, 28 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

/dev/nandd 大小分明是134M。 /dev/nanda 大小是33M，反变成了127.7M。
没搞懂是怎么回事。是系统挂载问题吗？还是系统包问题。

下面是我的sys_partition.fex分区文件
[partition_start]

;------------------------------>mmcblk0p2/nanda
[partition]
    name         = bootloader
    size         = 65536
    downloadfile = "bootloader.fex"
    verify       = 1
;------------------------------>mmcblk0p5/nandb
[partition]
    name         = env
    size         = 32768
    downloadfile = "env.fex"
    verify       = 1
;------------------------------>mmcblk0p6/nandc
[partition]
    name         = boot
    size         = 32768
    downloadfile = "boot.fex"
    verify       = 1

[partition]
    name         = rootfs
    size         = 262144
    downloadfile = "rootfs.fex"
    verify       = 1

主要问题是，当我的系统增大到62.3M时，系统无法启动。mount 文件系统时出错。
e2fsck /dev/nandd return 1
[    5.681976] EXT4-fs (nandd): barriers disabled
[    5.688301] EXT4-fs (nandd): mounted filesystem with ordered data mode. Opts: noauto_da_alloc,barrier=0,data=ordered
[    5.701027] [uart]: uart0 LCR & BAUD changed, reset controller...
mount /dev/nandd return 0
[    5.890244] init used greatest stack depth: 5240 bytes left
[    5.896539] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000
[    5.896546]
[    5.906805] [] (unwind_backtrace+0x0/0xe0) from [] (panic+0x80/0x1d0)
[    5.915980] [] (panic+0x80/0x1d0) from [] (do_exit+0x330/0x744)
[    5.924564] [] (do_exit+0x330/0x744) from [] (do_group_exit+0x88/0xb4)
[    5.933823] [] (do_group_exit+0x88/0xb4) from [] (__wake_up_parent+0x0/0x18)
[    5.943655] CPU0: stopping
[    5.946687] [] (unwind_backtrace+0x0/0xe0) from [] (handle_IPI+0xf8/0x1d4)
[    5.956311] [] (handle_IPI+0xf8/0x1d4) from [] (gic_handle_irq+0x50/0x58)
[    5.965849] [] (gic_handle_irq+0x50/0x58) from [] (__irq_svc+0x40/0x70)
[    5.975170] Exception stack(0xc06bdcf0 to 0xc06bdd38)
[    5.980815] dce0:                                     00000400 c06bdeac 00000001 0000122f
[    5.989952] dd00: ef03e740 00000000 c06bde6c ef001180 00000001 00000000 00000


麻烦大家指点下，谢谢！（我还尝试过SDcard, 也是一样。emmc的话，用Phoenixsuit工具没法烧录）。