cannot load leon2 registers file

[bat52]

loading leon2 register description file https://github.com/bat52/cheap_pie/blob/master/devices/leon2_creg.xml fails with this error

ValueError: invalid literal for int() with base 10: '4 * (2 ** 10)'

[olofk]

In order to evaluate these expressions, we need to have a full systemverilog expression parser within ipyxact, which we don't. There are basically three ways to handle this.

1. Write a full systemverilog expression parser in Python. This is probably a terrible idea that would require an insane amount of work
2. Integrate an existing systemverilog expression parser. Perhaps we can use e.g. verible, surelog or verilator for this, but I haven't looked into how hard it would be to extract the expression parser from any of those.
3. Handle this on a case-by-case basis and just keep adding support when we encounter issues. Long-term, this would be terrible, but might be a reasonable path forward short-term