[U-Boot] u-boot.2013.07 build fails: serial_puts() undefined.

[Randy Graham]

Hello,

I am building u-boot.2013.07 for the mx28evk board.

After I insert a few 'serial_puts()' calls for debugging, the build fails
and complains that serial_puts() is undefined.

I did not have this problem with u-boot.2013.01.

Do I need to add a specific #define to include serial_puts() ?
I tried adding '#define DEBUG' to include/common.h' with no luck.

I have looked through the source code but can't figure out what's wrong.

Thanks for any help,

-Randy