# Two bitstreams and the location of both are overlapping

**URL:** <https://discuss.pynq.io/t/two-bitstreams-and-the-location-of-both-are-overlapping/1210>\
**Category:** Support\
**Created:** [April 29, 2020, 9:49pm UTC](https://discuss.pynq.io/t/two-bitstreams-and-the-location-of-both-are-overlapping/1210 "2020-04-29T21:49:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![kuoyaoming93](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/kuoyaoming93/32/856_2.png) [@kuoyaoming93](https://discuss.pynq.io/u/kuoyaoming93)\
**Post date:** [April 29, 2020, 9:49pm UTC](https://discuss.pynq.io/t/two-bitstreams-and-the-location-of-both-are-overlapping/1210/1 "2020-04-29T21:49:28Z")

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Hello there,

If I use vivado and set in the floorplan pblocks location for each different design.

It suppose that pynq enviroment will give me an error in runtime if I try to load two bitstreams and the location of both are overlapping. Right?

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**Author:** ![cathalmccabe](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/cathalmccabe/32/3348_2.png) [@cathalmccabe](https://discuss.pynq.io/u/cathalmccabe)\
**Post date:** [April 30, 2020, 8:29am UTC](https://discuss.pynq.io/t/two-bitstreams-and-the-location-of-both-are-overlapping/1210/2 "2020-04-30T08:29:51Z")

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Adding this post to a new topic. Please open a new topic for separate issues.

The FPGA is a physical device. You either configure it all at once with a single bitstream, or part of the device with a partial bitstream.

If you have two (full) bitstreams, when you download one, it will overwrite whatever was there previously.

Partial bitstreams need to be planned carefully. You would have a distinct PR region, and only overwrite this region to replace the previous function. You would not have overlapping block as this would not work.

Cathal

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<div class="post-metadata">

**Author:** ![kuoyaoming93](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/kuoyaoming93/32/856_2.png) [@kuoyaoming93](https://discuss.pynq.io/u/kuoyaoming93)\
**Post date:** [April 30, 2020, 12:01pm UTC](https://discuss.pynq.io/t/two-bitstreams-and-the-location-of-both-are-overlapping/1210/3 "2020-04-30T12:01:20Z")

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I expressed wrong, was referring about partial reconfiguration.  
It’s all clear now, thank you very much Cathal!

Yao-Ming