[Xylo-SDR] Xylo/Saxo users - PROM warning

[pvharman@arach.net.au]

I?ve been corresponding with Jean at fpga4fun for a while about a problem that 
I have had with a number of my Xylo boards.  If I program the PROM with code 
that uses the USB then I can no longer read/write/verify the PROM. 

Jean advised yesterday that if you do this then the only way you can recover 
the PROM is to use the JTAG interface.  Thinking about this for a while it 
does make sense and you can always program the FPGA via the USB so it?s not 
really a problem for us. 

So?.. unless you have a JTAG programmer (or want to replace the PROM!) don?t 
program the Xylo/Saxo PROM with code that talks to the USB port.  All other 
code is OK ? LED flash etc, just watch out for  Bill and my Wolfson and test 
code.