U-Boot banner is printed in makefile of u-boot. If you edit following lines, and execute updated u-boot , you can see desired banner.

$(VERSION_FILE):

                                 printf ' #define U_BOOT_VERSION "YOUR STRING" ' \

                                    "$(U_BOOT_VERSION)"

Also, you can edit version, patch level, sublevel and extraversion field of u-boot which are defined at the top of makefile.

I have an experience with execute u-boot standalone application on P2041RDB. Standalone addres (CONFIG_STANDALONE_LOAD_ADDR) is given 0x40000 as default. This configuration is in ./arch/powerpc/config.mk in my model. I don't why, I cannot execute simple hello_world application following commands which locates ./examples/standalone/hello_world.c

1. tftp 40000 hello_world.bin

    go 40000 

2.  tftp 40000 hello_world.elf

     bootelf -p 40000 

Both of them gives illegal insturction error.

Then, I update standalone address to 0x23000. Following command works now!

 tftp 23000 hello_world.bin

go 23000

But still, bootelf command does not work..

Maybe, you have experienced this problem.. I wish this guide helps you!