Is vivado indirectly required?

[Kreijstal]

Since this depends on project x rays, and project x rays depends on an old version of vivado, I guess this project requires vivado, then?

[marzoul]

No. Project Xray only uses Vivado to document the bitstream format.
Nextpnr only uses the resulting document.

[Kreijstal]

ah, so step 1 of
https://github.com/f4pga/prjxray
is optional?
Or it is for mantainers, not for users, right?

Edit: I actually don't know which steps are meant for users

[lehaifeng000]

vivado is optional