[SPARC64]: In early bootup, BUG() if cannot find TLB entry for remapping.

arch/sparc64/kernel/head.S

@@ -151,6 +151,9 @@ cheetah_generic_boot:
 	blu,pt	%xcc, 1b
 	 add	%l0, (1 << 3), %l0
 
+	/* BUG() if we get here... */
+	ta	0x5
+
 cheetah_got_tlbentry:
 	ldxa	[%l0] ASI_ITLB_DATA_ACCESS, %g0
 	ldxa	[%l0] ASI_ITLB_DATA_ACCESS, %g1
@@ -333,6 +336,9 @@ spitfire_create_mappings:
 	blu,pt	%xcc, 1b
 	 add	%l0, (1 << 3), %l0
 
+	/* BUG() if we get here... */
+	ta	0x5
+
 spitfire_got_tlbentry:
 	/* Nops here again, perhaps Cheetah/Blackbird are better behaved... */
 	nop