[Libre-soc-dev] LibreSOC Implementation on arty7 fpga dev boards.

Veera vklr at vkten.in
Sat Oct 9 15:08:43 BST 2021

On Sat, Oct 09, 2021 at 01:24:42PM +0000, lkcl wrote:
> On October 9, 2021 8:50:37 AM UTC, varun mohan <varunmadhavam at gmail.com> wrote:
> >Well,
> >I finally got it to synthesize this time.
> this is a fault with the vpr router program that is beyond our control.
> more specifically: it is a fault with the *optimised* version of vpr that was patched (i think) by... advansys? advantec?  someone was contracted (i think) by google to speed up vpr to make it multi-threaded, which means it's possible that the fault was caused by the optimisation modifications: it's too early to tell, one way or the other.
> the segfault should be reported on the irc.libera.chat #symbiflow channel because they will want the coredump and other details in order to be able to investigate.
> because it is *not* the standard upstream version of vpr, you should *not* immediately contact the upstream vpr developers... not yet.  but, we need to work that out.
> now.  if your first instinct is to "throw away everything and start again, but replace vpr", this again risks not having the exact same conditions.
> what i recommend you do (to save a lot of time) is:
> 0) take a backup snapshot of the chroot so that you
>      have everything needed to provide to #symbiflow
>      channel.
> 4) *manually* install the *upstream* version of
>      vpr and you will find instructions that Veera has
>      done on how to do that, at:

Varun, which symbiflow toolchain you are using? toolchain compiled from
source(symbiflow-arch-defs) or binary provided one.

anyways, use vtr git commit 77a3df829fdf509a76b9d7b941376f3835c2576a
instructions for building vtr are in HDL_Worklfow/symbiflow (see Bug: 654)

>      https://bugs.libre-soc.org/show_bug.cgi?id=654
> 5) join #libre-soc IRC because you will find that
>      Veera is on there and it will be easier to talk
>      to him about how he set up symbiflow and the
>      installation of vpr.
> if and *only* if the exact same segfault occurs once you have used the *upstream* version of vpr should you contact the upstream developers and let them know.
> l.


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