6.5.6.2.2 Boot Communication Channels

The DSU also provides two additional registers, BCC0 and BCC1, for communication between the debugger and CPU while the Boot ROM is executing. These registers map to the DCC0/1 registers but have their own dirty bits. These dirty bits also reside in the DSU.STATUSB register and are called BCCD0 and BCCD1. These bits were added to ensure that the usage of the Boot ROM does not interfere with DCCx communication.