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1 1      FIRMWARE UPGRADE

1 0 6      Copernicus GPS Receiver

The Flash memory chip of the GPS receiver is divided into several functional 
sections. The Boot ROM section is loaded during production and cannot be changed 
or erased without special packets with password protection. The User Data section is 
maintained by the application. The Copernicus GPS Receiver Firmware section holds 
the main software application, and can be erased and loaded with a newer version 
through the GPS receiver’s serial port.

The boot monitor module is a part of the Boot ROM section. It provides facilities to 
perform checksum verification and RAM tests, and to read/write data from/to a 
specified location in RAM or Flash, thus allowing the user to update the firmware.

The GPS receiver will enter the boot monitor mode if either of the following 
conditions occurs:

•

Application firmware checksum verification failed at power-up;

•

RAM test failed at power-up;

•

A special protocol packet is issued by the user.

Once the system is in the monitor mode, a special Monitor protocol is used to 
communicate with the Copernicus GPS Receiver (here after referred as the Target). 
The necessary details about this protocol are presented in Appendix A.

To return from the monitor to the normal GPS operating mode (i.e. execute the 
application firmware), either

•

Cycle the main power or

•

Toggle the reset pin, or 

•

Send a “Restart Target” packet described on 

The default settings for the Copernicus GPS receiver’s serial ports in the monitor 
mode are:

•

Serial port A: 38400 baud, 8 data bits, 1 stop bit, and no parity

•

Serial port B: 4800 baud, 8 data bits, 1 stop bit, and no parity 

Table 11.1

Functional Software Components and Memory Map

Word Address

Software Component/Section

0x3FC000 – 0x3FFFFF

Boot ROM

0x3F8000 – 0x3FBFFF

<reserved>

0x3E0000 – 0x3F7FFF

User Data

0x360000 – 0x3DFFFF

Copernicus GPS Firmware

0x300000 – 0x35FFFF

<reserved>