Re: [myhdl-list] GHDL co-simulation

[Jan D. <ja...@ja...>]

Christopher L. Felton wrote:
> 
> I was investigating the GHDL VHPI (VPI) support a little since I have 
> been having issues with co-simulation, thought I would try another 
> approach.  According to the GHDL website enough of the VPI interface has 
> been implemented to support IVI.
> 
> Working off an example I was able to compile the cver myhdl_vpi.c and 
> load it in GHDL.  I have not looked at the MyHDL PLI/VPI implementation 
> enough to go beyond this point.
> 
> I have included the hg bundle that has the Makefile.  Does anyone know 
> if there is a GHDL VPI limitation that would make this _not_ worth 
> pursuing?  Or has the GHDL VPI interface matured enough to support 
> co-simulation with MyHDL?

If you can get this to work, it would be extremely helpful!

Regarding your questions: I have no idea :-) I've looked at the available
ghdl documentation again and its seems VPI functionality is in the same
state as when I looked at it a few years ago. Meaning: no real documentation,
only some examples.

It looks like ghdl itself is actively developed and supported, but I've
no idea whether this covers the VPI stuff also.

In short: we may be lucky and get it to work, but if we're not, we may
be in a dead end after a considerable amount of work. Getting this
to work with Icarus was painful, but I did get support when I needed
it. Given the ghdl uncertainties, I wasn't very motivated to work on
it, but of course, I welcome all fresh attempts to give it a try!

Jan

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