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#28 MMIO bus driver
When running on an embedded system, all the flash programming code etc. could be used with direct memory mapped access. A "bus driver" that just maps write(x,y) into actual memory access (not using JTAG) would enable the user to access flash which is directly attached to the CPU on which UrJTAG is running.
This would make sense e.g. on a system with Flash and FPGA connected to a Microcontroller, where UrJTAG is used to configure the FPGA; no other software to modify the locally connected flash would be required.