[U-Boot] Uboot build system question

[Bharath H S]

Hi all,
I had a question regarding uboot build system.
One starts a build for platform1 and without cleaning tree builds for
platform2, what is the expected result?
make <platform1>_config
make <platform2>_config

Is the final product build of platform2 or goes to inconsistent state
or implementation dependent?
In linux kernel, all dependencies are rebuilt and we expect build for
the 2nd defconfig.

Thanks,
Bharath