~ruther/vhdl-spi-2

ref: 19cab4548832988e5a3dd440796c69617c46e2f6 vhdl-spi-2/hdl_spi/tests/Makefile -rw-r--r-- 707 bytes 
chore: add ghdl support vhdl2008 arg

chore: few updates

feat: implement initial hdl_spi