linux boot problem on omap3530 custom board

hello all

we have omap3530 custom board which we have booted linux-omap-3.1 successfully using sd card

but we are getting some problem while booting through the nand flash..

the error log is as below

[    3.981079] ThumbEE CPU extension supported.
[    3.990814] sr_init: No PMIC hook to init smartreflex
[    3.996459] smartreflex smartreflex.0: omap_sr_probe: SmartReflex driver initialized
[    4.004852] smartreflex smartreflex.1: omap_sr_probe: SmartReflex driver initialized
[    4.013183] SmartReflex Class3 initialized
[    4.024108] clock: disabling unused clocks to save power
[    4.030914] registered taskstats version 1
[    4.053771] Console: switching to colour frame buffer device 80x30
[    4.081207] regulator_init_complete: VDAC: incomplete constraints, leaving on
[    4.094116] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
[    4.105957] omap_vout omap_vout: Buffer Size = 3686400
[    4.117645] omap_vout omap_vout: : registered and initialized video device 0
[    4.130950] RAMDISK: gzip image found at block 0
[    5.314178] VFS: Mounted root (ext2 filesystem) on device 1:0.
[    5.325744] devtmpfs: mounted
[    5.333923] Freeing init memory: 228K
[    5.942413] udevd (72): /proc/72/oom_adj is deprecated, please use /proc/72/oom_score_adj instead.
[    5.985504] udevd version 124 started
[   10.384307] end_request: I/O error, dev mtdblock1, sector 0
[   10.398193] Buffer I/O error on device mtdblock1, logical block 0
[   10.408966] end_request: I/O error, dev mtdblock1, sector 8
[   10.418945] Buffer I/O error on device mtdblock1, logical block 1
[   10.429565] end_request: I/O error, dev mtdblock1, sector 16
[   10.439544] Buffer I/O error on device mtdblock1, logical block 2
[   10.450134] end_request: I/O error, dev mtdblock1, sector 24
[   10.460113] Buffer I/O error on device mtdblock1, logical block 3
[   10.530487] end_request: I/O error, dev mtdblock0, sector 0
[   10.540557] Buffer I/O error on device mtdblock0, logical block 0
[   10.551300] end_request: I/O error, dev mtdblock0, sector 8
[   10.561370] Buffer I/O error on device mtdblock0, logical block 1
[   10.572265] end_request: I/O error, dev mtdblock0, sector 16
[   10.582763] Buffer I/O error on device mtdblock0, logical block 2
[   10.593872] end_request: I/O error, dev mtdblock0, sector 24
[   10.604461] Buffer I/O error on device mtdblock0, logical block 3
[   10.626373] end_request: I/O error, dev mtdblock1, sector 0
[   10.637176] Buffer I/O error on device mtdblock1, logical block 0
[   10.664764] end_request: I/O error, dev mtdblock0, sector 0
[   10.675750] Buffer I/O error on device mtdblock0, logical block 0

the kernle stops booting here

we are using the ram filesystem.. the boot args are as belw

setenv bootargs 'console=ttyO2,115200n8 console=tty0 root=/dev/ram0 rw ramdisk_size=32768 initrd=0x81600000,32M'
setenv bootcmd 'nand read.i 80300000 280000 400000;nand read.i 81600000 680000 800000;bootm 80300000'

i aslo tried with disabling the MTD device drivers in kernel configuratoin

then also kernel hangs at "[    5.985504] udevd version 124 started "

pls help us to solve the issue..