Erasing blocks of memory in flash

Iam trying to make OMAP5912-osk as standalone by porting U-boot as bootloader and linux2.6.24 as kernel.Iam mounting JFFS2 as filesystem.
I have no problem in porting U-boot and kernel on the flash of the board.

I have done the steps as
for U-boot
#tftpboot 0x10000000 u-boot.bin
#erase 1:0
#cp.b 0x10000000 0x00 xxxxxx

for Kernel
#tftpboot 0x10000000 uImage.cc
#erase 1:8-16
#cp.b 0x10000000 0x100000 xxxxxx

where u-boot.bin and uImage.cc are the images of bootloader and kernel respectively. xxxxxxx is the size.

I used MTD for compatibility between JFFS2 and the board.

when I was trying to erase the flash for mounting JFFS2, it is giving an error like "bad sector specification"

erase 1:128-255

Please give me any solution for this....

Are you able to erase the full range? eg 'erase 1:17-258'

Have you tried erasing just part of the range? eg 'erase 1:17-23'

Have you tried specifying address ranges instead of sectors? eg 'erase 0x1000000 0x1ffffff'

What does 'flinfo' report? Is it possible that write protection has been turned on?

This reason is happended according to different u-boot version.
In my case, I used different method per each u-boot version as belows.
If you use u-boot ver 1.1.6, Please type "erase 0x1000000 0x1ffffff" command.
and, If you use u-boot ver 1.1.1, Please type "erase 1:128-255" command.
Good Lucks.
This is my test information: arm-gcc 4.2.0 , linux 2.6.29.