[yocto] Concept clarification: can we deploy Yocto SDK to target?

[Jerry Lian]

I am confused about the concept of Yocto SDK:
* when we use "bitbake -c populate_sdk some_image", we obtain sysroots for
both target and host.
* But why do we need sysroot for host?

* I know we can build application under target-sysroot (surely source the
environment), with fast speed.
* But can we deploy target-sysroot to hardware-target?
(Yes, I do want to compile/build application inside hardware-target, even
though it is slow)

Thanks!
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