AC_BUS_ERROR       20 include/asm-m68k/contregs.h #define AC_BUS_ERROR  0x60000000    /* 34  Not cleared on read, byte.        */
AC_BUS_ERROR       34 include/asm-m68k/sun3mmu.h #define AC_BUS_ERROR  0x60000000    /* 34  Cleared on read, byte.            */