[U-Boot] how to create a uboot for my board

[Nelson Kon Yii]

To whom this may concern:
I am using a board, CSB733.  It has the microcontroller from freescale,
MCiMX31VMN5C.  It is having UMON as the boot loader inside.  I tried to load
QNX into the board but was not successful.  I need to change to Uboot to
try.  Can someone teach me how to create a uboot to be loaded into the
board?  I have no experience in this and this is my first time creating a
boot loader.

Your help is very much appreciated.

Hope to hear from you soon.

Thanks.

Sincerely,
Nelson