Hi, Mthobisi,
Unfortunately, I have not the experience to use Geopel Cascon Boundary Scan, currently, I think this is normal procedure to write external Flash. The tools is suite 56 tools including assembly compiler and debugger.
1)using gds56300.exe debugger, user can download his application code to the internal RAM of DSP56300 via JTAG.
2)using gds56300.exe debugger, user can download the writing flash code to another location in internal RAM of DSP56300 via JTAG, running the writing flash code in debugger, the application code will be copied to flash based on the boot-up format.
Hope it can help you.
As you know that the DSP56300 is end of life, we no longer supports the family.
BR
XiangJun Rong