Hi,

I want to know the step to port u-boot on my custom board and required tools

Read the Readme of the project. It has a lot of information about the options available in the uboot. If you have a board, that is not already supported by uboot, then you need to do the following. These steps are also listed in the Readme.

1. Add a new configuration option for your board to the toplevel "Makefile" and to the "MAKEALL" script, using the existing entries as examples. Note that here and at many other places boards and other names are listed in alphabetical sort order. Please keep this order. 2. Create a new directory to hold your board specific code. Add any files you need. In your board directory, you will need at least the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds". 3. Create a new configuration file "include/configs/<board>.h" for your board 3. If you're porting U-Boot to a new CPU, then also create a new directory to hold your CPU specific code. Add any files you need. 4. Run "make <board>_config" with your new name. 5. Type "make", and you should get a working "u-boot.srec" file to be installed on your target system. 6. Debug and solve any problems that might arise. [Of course, this last step is much harder than it sounds.]

-- Ajay