For convenience, there are two bitstreams available for the TS-7500: one with
CAN and 3 XUARTS and the other with no CAN and 8 XUARTS.  They have been named
respectively as ts7500_opencore_can.vme.gz and ts7500_opencore_xuart.vme.gz.  
The ts7500_top.v parameters (starting on line 198) are outlined below.

ts7500_opencore_can.vme.gz:

   parameter sdcard_opt = 1'b1;
   parameter can_opt = 1'b1;
   parameter spi_opt = 1'b1;
   /* software currently requires these to be enabled/disabled contiguously. */
   parameter xuart0_opt = 1'b1;
   parameter xuart1_opt = 1'b1;
   parameter xuart2_opt = 1'b1;
   parameter xuart3_opt = 1'b0;
   parameter xuart4_opt = 1'b0;
   parameter xuart5_opt = 1'b0;
   parameter xuart6_opt = 1'b0;
   parameter xuart7_opt = 1'b0;


ts7500_opencore_xuart.vme.gz:

   parameter sdcard_opt = 1'b1;
   parameter can_opt = 1'b0;
   parameter spi_opt = 1'b1;
   /* software currently requires these to be enabled/disabled contiguously. */
   parameter xuart0_opt = 1'b1;
   parameter xuart1_opt = 1'b1;
   parameter xuart2_opt = 1'b1;
   parameter xuart3_opt = 1'b1;
   parameter xuart4_opt = 1'b1;
   parameter xuart5_opt = 1'b1;
   parameter xuart6_opt = 1'b1;
   parameter xuart7_opt = 1'b1;
