From 8c69a3bba3d72dd445f1003d470c3ed5ed06c5d4 Mon Sep 17 00:00:00 2001
From: Sylvain Munaut <tnt@246tNt.com>
Date: Sat, 17 Nov 2018 10:19:08 +0100
Subject: [PATCH] ice40/pack: Make sure we don't use a LOCKED bel when placing
 PLL

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
---
 ice40/pack.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ice40/pack.cc b/ice40/pack.cc
index e0a9f6ad..d0142fa3 100644
--- a/ice40/pack.cc
+++ b/ice40/pack.cc
@@ -838,6 +838,8 @@ static void pack_special(Context *ctx)
                 for (auto bel : ctx->getBels()) {
                     if (ctx->getBelType(bel) != id_ICESTORM_PLL)
                         continue;
+                    if (ctx->isBelLocked(bel))
+                        continue;
 
                     // A PAD PLL must have its' PACKAGEPIN on the SB_IO that's shared
                     // with PLLOUT_A.