# Can pre-built rootfs images be used for building all PYNQ versions?

**URL:** <https://discuss.pynq.io/t/can-pre-built-rootfs-images-be-used-for-building-all-pynq-versions/973>\
**Category:** Support\
**Created:** [March 3, 2020, 7:24pm UTC](https://discuss.pynq.io/t/can-pre-built-rootfs-images-be-used-for-building-all-pynq-versions/973 "2020-03-03T19:24:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![pynqzen](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/pynqzen/32/97_2.png) [@pynqzen](https://discuss.pynq.io/u/pynqzen)\
**Post date:** [March 3, 2020, 7:24pm UTC](https://discuss.pynq.io/t/can-pre-built-rootfs-images-be-used-for-building-all-pynq-versions/973/1 "2020-03-03T19:24:09Z")

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Hi,

The latest rootfs images are on [pynq.io](http://pynq.io). Will these also work for all prior PYNQ releases when porting to other boards?

Thanks!

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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:** [March 4, 2020, 8:14am UTC](https://discuss.pynq.io/t/can-pre-built-rootfs-images-be-used-for-building-all-pynq-versions/973/2 "2020-03-04T08:14:51Z")

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No, you should use the correct version of the rootfs.  
Are you trying to build an image using an older version of PYNQ for another board? If so, could you let us know why?

Cathal

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**Author:** ![pynqzen](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/pynqzen/32/97_2.png) [@pynqzen](https://discuss.pynq.io/u/pynqzen)\
**Post date:** [March 4, 2020, 11:30pm UTC](https://discuss.pynq.io/t/can-pre-built-rootfs-images-be-used-for-building-all-pynq-versions/973/3 "2020-03-04T23:30:21Z")

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Thanks Cathal,

Yes, a Zedboard. The reason is that it is less trouble right now to create an older version of PYNQ than upgrade many workstations with new tools. Where can older revisions of PYNQ rootfs be found for download or perhaps a script to regenerate?

Kind regards

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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:** [March 6, 2020, 9:04am UTC](https://discuss.pynq.io/t/can-pre-built-rootfs-images-be-used-for-building-all-pynq-versions/973/4 "2020-03-06T09:04:43Z")

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We can provided older files. I’ll send you a direct message.

Cathal