[U-Boot] [PATCH] post: fix compile issue for post tests on kirkwood

[Marek Vasut]

> commit f31a911fe (arm, post: add missing post_time_ms for arm)
> enables get_ticks and get_tbclk for all arm based boards,
> but kirkwood has currently no implementation for this. So
> undefine this for kirkwood boards.

So this means the kirkwood timer doesn't conform to current timer api? Why work 
it around and not fix it then?

M