Have got the uImage file generated:

tool/build_hw_imx53/var/run>tree
.
└── tz_vmm
    ├── boot_modules.s
    ├── image.elf
    └── uImage

but problem is after "sudo dd if=./uImage of=/dev/mmcblk0 bs=1M" onto my sdcard (/dev/mmcblk0) it seemed to bootup with any boot prompts on the console interface.