Latest ESP patch problem

[Blue Swirl]

Using the latest version of esp.c, I get exception at boot. But if I disable 
the POP(), boot succeeds. I understand that my-unit should push two ints, so 
there must be a stack messing error (maybe extra POP?) later.

Index: drivers/esp.c
===================================================================
--- drivers/esp.c       (revision 37)
+++ drivers/esp.c       (working copy)
@@ -263,7 +263,7 @@

fword("my-unit");
     id = POP();
-    POP(); // unit id is 2 ints but we only need one.
+    //POP(); // unit id is 2 ints but we only need one.
     *sd = &global_esp->sd[id];

#ifdef CONFIG_DEBUG_ESP

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