Motorola Background Debug Mode Driver for OpenBSD

 The BDM driver is built as a OpenBSD loadable kernel module, not as
 a driver that can be linked into the kernel.  The BDM kernel module
 is loaded and unloaded at runtime, with the modload and modunload
 commands.

 The BDM kernel module has been built and tested with OpenBSD 2.9,
 the Coldfire processor and P&E Coldfire interface.  The code is
 a port of the current FreeBSD driver.

 To build:
 =========
   - ensure kernel was builit with 'option LKM'
   - ensure /etc/rc.securelevel securelevel=-1 to allow loading modules
   - compile driver using following command
     cc -O2 -D_KERNEL -I/sys -c openbsd-bdm.c

 To install (as root):
 =====================
   - mkdir /usr/lkm
   - cp openbsd-bdm.o /usr/lkm/.
   - cp bdm-install.sh /usr/lkm/.
   - add the following to /etc/rc.securelevel (for auto load on startup)
     if [ -r /usr/lkm/openbsd-bdm.o ]
     then
       echo -n ' openbsd-bdm'
       /sbin/modload -o bdm.o -ebdm -p /usr/lkm/bdm-install.sh /usr/lkm/openbsd-bdm.o >/dev/null
     fi

   - add the following to /etc/rc.shutdown (for auto unload on shutdown)
     if [ -r /usr/lkm/openbsd-bdm.o ]
     then
       /sbin/modunload -n bdm >/dev/null
     fi


 To load BDM kernel module:
 ==========================
   - modload -o bdm.o -ebdm -p bdm-install.sh openbsd-bdm.o


 To unload BDM kernel module:
 ============================
   - modunload -n bdm


 To build gdb5.0:
 ================
   - apply gdb-bdm patches
   - edit $GDBSRC/gdb/configure.host
     - copy following netbsd line to add support for openbsd host
       i[3456]86-*-netbsd*) ... to
       i[3456]86-*-openbsd*) ...
   - build gdb using standard configure/make all/make install