The Digilent JTag uses FT2232, but its configuration EEPROM contains secrete data needed to be recoginzed by Xilinx ISE/Vivado. The following method only works on linux (tested on Ubuntu16.04), but the patched FT2232 doggle also works on Windows.
DONT use FT_Prog on the programmed FT2232 or offical Digilent cables, as it can trash the firmware! The correct eeprom contains secrete data that cannot be handled correctly by FT_Prog.
- Install softwares:
sudo apt-get install libftdi1 - Download the zip file (digilent_eeprom.zip) from the link at the end of this page and unzip it. If the link/file is not accessable, see the following for their content.
- Backup the original content of the EEPROM:
sudo ftdi_eeprom --read-eeprom flash_digilent.conf - Flash the EEPROM:
$ sudo ftdi_eeprom --flash-eeprom flash_digilent.conf
flash_digilent.conf:
vendor_id=0x0403
product_id=0x6010
flash_raw=true
filename="digilent_eeprom.raw" # Filename, leave empty to skip file writing
hexdump of digilent_eeprom.raw: digilent_eeprom.raw is a binary file!
rikka@rikka-virtual-machine:~$ hexdump -C digilent_eeprom.raw
00000000 01 01 03 04 10 60 00 07 80 2f 08 00 00 00 9a 12 |.....`.../......|
00000010 ac 34 e0 1a 00 00 00 00 56 00 01 00 c7 92 6a 35 |.4......V.....j5|
00000020 51 01 80 30 4a 74 61 67 53 6d 74 31 00 00 00 00 |Q..0JtagSmt1....|
00000030 00 00 00 00 00 44 69 67 69 6c 65 6e 74 20 4a 54 |.....Digilent JT|
00000040 41 47 2d 53 4d 54 31 00 00 00 00 00 00 00 00 00 |AG-SMT1.........|
00000050 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000090 00 00 00 00 00 00 00 00 00 00 12 03 44 00 69 00 |............D.i.|
000000a0 67 00 69 00 6c 00 65 00 6e 00 74 00 34 03 44 00 |g.i.l.e.n.t.4.D.|
000000b0 69 00 67 00 69 00 6c 00 65 00 6e 00 74 00 20 00 |i.g.i.l.e.n.t. .|
000000c0 41 00 64 00 65 00 70 00 74 00 20 00 55 00 53 00 |A.d.e.p.t. .U.S.|
000000d0 42 00 20 00 44 00 65 00 76 00 69 00 63 00 65 00 |B. .D.e.v.i.c.e.|
000000e0 1a 03 32 00 31 00 30 00 32 00 30 00 33 00 38 00 |..2.1.0.2.0.3.8.|
000000f0 35 00 39 00 32 00 38 00 39 00 02 03 00 00 7b 6e |5.9.2.8.9.....{n|
00000100
Patch the second interface to become a UART Compile (gcc xxx.c -o xxx) the following code and run it. It will patch the EEPROM file (digilent_eeprom.raw) and recalculate the checksum. After patching, follow mentioned procedure to flash the patched EEPROM. Now interface A is JTag (Digilent & Xilinx compatible) and interface B is UART which can be used for debug purposes.
Changes: byte0x01: 0x01 -> 0x08, byte0xFE: 0x7B->0xFB, byte0xFF: 0x6E->0x6A
#include <stdio.h>
#include <stdint.h>
int main()
{
uint8_t buf[256];
int size = sizeof(buf);
unsigned short checksum, value;
FILE * pFile;
pFile = fopen("digilent_eeprom.raw", "rw+b");
fread(buf, 1, 256, pFile);
buf[1] = 0x08;
// calculate checksum
checksum = 0xAAAA;
for (int i = 0; i < size/2-1; i++)
{
value = buf[i*2];
value += buf[(i*2)+1] << 8;
checksum = value^checksum;
checksum = (checksum << 1) | (checksum >> 15);
}
printf("%02x, %02x\n", buf[size-2], buf[size-1]);
buf[size-2] = checksum & 0xFF;
buf[size-1] = (checksum >> 8 ) & 0xFF;
fseek(pFile, 0, SEEK_SET);
fwrite(buf, 1, 256, pFile);
fclose(pFile);
return 0;
}
References:
http://jumpstartengineering.com/embedded_systems/jtag/changing-ft2232h-based-device-parameters/