Index: sys/powerpc/aim/mmu_oea64.c
===================================================================
--- sys/powerpc/aim/mmu_oea64.c
+++ sys/powerpc/aim/mmu_oea64.c
@@ -390,7 +390,7 @@
 
 	if (!moea64_initialized || bootstrap) {
 		if (moea64_bpvo_pool_index >= moea64_bpvo_pool_size) {
-			panic("moea64_enter: bpvo pool exhausted, %d, %d, %zd",
+			panic("%s: bpvo pool exhausted, index=%d, size=%d, bytes=%zd. Try to increase it using 'machdep.moea64_bpvo_pool_size=new_value' as boot parameter", __func__,
 			      moea64_bpvo_pool_index, moea64_bpvo_pool_size,
 			      moea64_bpvo_pool_size * sizeof(struct pvo_entry));
 		}
@@ -914,6 +914,7 @@
 	/*
 	 * Initialise the bootstrap pvo pool.
 	 */
+	TUNABLE_INT_FETCH("machdep.moea64_bpvo_pool_size", &moea64_bpvo_pool_size);
 	moea64_bpvo_pool = (struct pvo_entry *)moea64_bootstrap_alloc(
 		moea64_bpvo_pool_size*sizeof(struct pvo_entry), PAGE_SIZE);
 	moea64_bpvo_pool_index = 0;