`bbaexport.py` fails for `xc7a35t`

[ajelinski]

The problem was introduced with the 565588a commit.
Basically, such a directory doesn't exist: external/prjxray-db/artix7/xc7a35t/tilegrid.json

See hdl/conda-eda#191 for more details.

[tmichalak]

It also seems that the prjxray-db is heavily outdated.

[jhladik]

The bbaexport.py also fails for xc7z020clg400-1:

python3 xilinx/python/bbaexport.py --device xc7z020clg400-1 --bba xilinx/xc7z020.bba Traceback (most recent call last): File "/Users/jhladik/Documents/Development/HDL/zybo-playground/tools/nextpnr-xilinx/xilinx/python/bbaexport.py", line 350, in <module> main() File "/Users/jhladik/Documents/Development/HDL/zybo-playground/tools/nextpnr-xilinx/xilinx/python/bbaexport.py", line 31, in main d = import_device(args.device, xraydb_root, metadata_root) File "/Users/jhladik/Documents/Development/HDL/zybo-playground/tools/nextpnr-xilinx/xilinx/python/xilinx_device.py", line 462, in import_device with open(prjxray_root + "/" + fabricname + "/tilegrid.json") as gf: FileNotFoundError: [Errno 2] No such file or directory: '/Users/jhladik/Documents/Development/HDL/zybo-playground/tools/nextpnr-xilinx/xilinx/python/../external/prjxray-db/zynq7/xc7z020clg400-1t/tilegrid.json'

There is no "t" in the FPGA part number so this splitting used by bbaexport.py won't work for Zynq-7000 family FPGAs/SoCs.

I had to change the fabricname = name.split('t')[0] + "t" to fabricname = name to make it work.