Hi Ralf, the R43XX is missing an entry in the tlbw synthesizer. Here is a patch. /Brian Index: arch/mips/mm/tlbex.c =================================================================== RCS file: /cvs/linux/arch/mips/mm/tlbex.c,v retrieving revision 1.17 diff -u -r1.17 tlbex.c --- arch/mips/mm/tlbex.c 1 Mar 2005 06:33:17 -0000 1.17 +++ arch/mips/mm/tlbex.c 17 Mar 2005 23:14:44 -0000 @@ -830,6 +830,7 @@ i_nop(p); break; + case CPU_R4300: case CPU_R4600: case CPU_R4700: case CPU_R5000: