In order to support CPUX and Xv2 devices, some refactoring is needed:
* split jtaglib into files concerning low-level JTAG/SBW physical layer
stuff, and a file containing the actual debug routines. the latter is
implemented in a separate file per CPU type (CPUX and Xv2 currently empty)
* use a lookup table dependig on the JTAG ID or CPU type to select which
function to use
* move the 'struct device' dependency in pif and mehfet to jtdev, as it
is needed everywhere, especially for device identification
In a next step, the following actions can be performed:
* Unify the read and write callbacks in pif and mehfet (used in readmem
and writemem of struct device) to remove the redundancy
* Unify the init_device function in pif and mehfet to properly detect
the device type, as done in v3hil. The device base type does query
this data independenly, however, which feels unwanted.
Triss