Reduce the booting time

Hi

i used OMAPL137BZKBD3 ( 300MHz ) and MT29F4G08ABADAWPITD(NANFLASH 512MiB 3.3V 8bit) in my board.

i used prebuild binary file in REL_LSP_02_20_00_07 ( ubl-nand.bin,dsp-nand-ais.bin,uboot.bin ) for nandflash.

i used uImage(1MB) and ramdisk.gz(9MB) with below comment in uboot prompt:

tftp 0xc0000000 uImage

nand erase 0x200000 0x100000

nand write.e 0xc0000000 0x200000 0x100000

tftp 0xc0300000 ramdisk.gz

nand erase 0x400000 0x900000

nand write.e 0xc0300000 0x400000 0x900000

i set bootarg and bootcmd with below comment in uboot prompt:

setenv bootcmd 'nand read.e 0xc0000000 0x200000 0x100000;nand read.e 0xc0300000 0x400000 0x900000;bootm 0xc0000000'

setenv bootargs 'mem=32M console=ttyS2,115200n8 root=/dev/ram0 rw initrd=0xc0300000,13M ip=off'

the boot time is about 14 second.

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i want reduced boot time.

if i used MT29F4G16ABADAWPITD(NANFLASH 512MiB 3.3V 16bit) instead of MT29F4G08ABADAWPITD(NANFLASH 512MiB 3.3V 8bit) the boot time is reduced ( about 7 second)?

if i increased pll setting for emifa, the boot time is reduced?

what is the default frequency for emifa?

where can i change pll setting for emifa ( ubl-nand.bin or dsp-nand-ais.bin or uboot.bin )?

what is the maximum frequency for emifa with this nandflash?

for reduced boot time,what can i do?

Regards,

Mahdi