Unexpected start_address returned when creating a segment slice

[rcb-tcs]

Looking at this line
start_address = address.start + self.start_address

I think the below would make more sense.
start_address = self.start_address

As of now, I get this behavior something like this:

>>> seg
<2048 byte segment @ 0x90000000>
>>> seg[0x90000000:0x90000010]
<16 byte segment @ 120000000>