Open scjody opened 7 months ago
Based on this comment I added zicsr
to the MARCH
variables: https://github.com/GideonZ/1541ultimate/pull/380
However this may not be the correct fix because I ended up with a broken firmware that wouldn't boot. (Note that the person who wrote the comment does not own an U2+L.)
Note, I'm currently using rv32i-131023
(GCC 13.2.0) from https://github.com/stnolting/riscv-gcc-prebuilt
With #380, I'm able to build a working firmware for my U2+L 🎉!
The broken firmware issue seems to be a result of a bad u2p_ecp5_impl1.bit
, possibly because I used Diamond 3.13 (3.12 doesn't seem to be available anymore). I don't need to modify the FPGA code so I don't plan on digging into this any further.
I have Diamond 3.13 builds that work, but I noticed that the timing was not met (by far) with the same settings used as for 3.12. Apparently the makefile doesn't check for this. In other words: check the timing closure manually.
I'm attempting to build the U2+L firmware for the first time and it fails with the following errors: