The official replies are addressing questions that nobody has asked. The main issue is why Linux support is being removed from the Basic tier while Windows is still allowed. To grow the ecosystem, AMD needs more people working on their hardware. Restricting Linux will only alienates students, hobbyists, and devs who want to adopt AMD tech. - From long term AMD user
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The only reason why the "Linux community" cannot create adequate FPGA design tools is that the vendors like AMD refuse to document the necessary details of their products.
A few old AMD FPGAs have been reversed engineered, e.g. some ARTIX-7, so for them there is no need for the rather bad AMD tools, but for most AMD formerly Xilinx FPGAs it is impossible to create better tools for lack of documentation.
As long as AMD refuses to provide the technical documentation required to use their products, it should have been a legal obligation to at least provide basic tools that allows the buyer of such products to actually use "FPGAs", i.e. to "field-program" them, as the name of the sold product claims.
Like many other FPGA developers, I could write myself better FPGA development tools than what AMD provides, if I had access to the complete FPGA technical documentation to which only a few big companies have access, a restriction whose only possible purpose is to prevent competition in the FPGA market.
If AMD had documented the exact format of the bit stream required to program each model of their FPGAs and the complete timing consequences of each synthesis choice, nobody would need any FPGA simulation or synthesis tool provided by AMD in Vivado.