mem: Allow disabling of tXAW through a 0 activation limit

This patch fixes an issue where an activation limit of 0 was not
allowed. With this patch, setting the limit to 0 simply disables the
tXAW constraint.

diff --git a/src/mem/simple_dram.cc b/src/mem/simple_dram.cc
index 2bb1cec9d9123d41e3cfebef3bd0fcf833e03d8e..3d8f71ee91550ce6c39b96c602a9ce67ca8e4a47 100644 (file)
--- a/src/mem/simple_dram.cc
+++ b/src/mem/simple_dram.cc
@@ -852,6 +852,10 @@ SimpleDRAM::recordActivate(Tick act_tick)
 
     DPRINTF(DRAM, "Activate at tick %d\n", act_tick);
 
+    // if the activation limit is disabled then we are done
+    if (actTicks.empty())
+        return;
+
     // sanity check
     if (actTicks.back() && (act_tick - actTicks.back()) < tXAW) {
         panic("Got %d activates in window %d (%d - %d) which is smaller "