How can I boot Cisco1841 with USB Drive instead of CF?

Hello
I need to boot Cisco1841 with USB Drive instead of Compact Flash but I don't know what should I do.
I heard I need to format USB Drive with FAT and need to save IOS on the USB Drive.
Before boot, Need to set config register ? I am not sure which parameter should I set config register in detail.
Please let me know if there is URL describing thease steps from the beginning.

http://www.cisco.com/en/US/prod/collateral/modules/ps6247/prod_qas0900aecd80232483.html
     Q. What sizes of USB Flash sticks are supported?
     A. USB Flash sticks are supported in 64, 128, and 256 MB sizes. No other sizes are supported.
     Q. Can I use any USB memory stick for this application?
     A. No. Only Cisco USB memory sticks are supported.
Q. Can I boot an image directly from the USB Flash module?
A. Yes. USB drivers have been added to rommon, starting with version 12.4(13r)
     Q. Can I format the USB Flash module on the router?
A. Yes. You can format the module on either a router or a PC. You must specify "FAT16 file system" as the file system for the PC format process to use.
If your setup satisfies above conditions you can get the router to boot up with the IOS on the USB flash
If you are in ROMMON mode, use 'dev' to find out the name of the USB Flash (should be usbflash0).
set BOOT=usbflash0:
If you are in the router,
boot system flash usbflash0:

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How can I boot Cisco1841 with USB Drive instead of CF?

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