FreeCalypso > hg > fc-usbser-tools
comparison eeproms/icestick @ 3:434806360d91
eeproms: subset import from freecalypso-hwlab
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sun, 03 Sep 2023 18:24:27 +0000 |
| parents | |
| children | d46ea7a3fa0c |
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| 2:17fdd0ba7a2e | 3:434806360d91 |
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| 1 # Lattice iCEstick FPGA board features an FT2232H chip, with Channel A wired | |
| 2 # for MPSSE mode (access to SPI flash and FPGA configuration controls) and | |
| 3 # Channel B wired as a UART for user logic implemented in the FPGA. This | |
| 4 # FT2232H subsystem includes a 93C56 EEPROM, but boards are shipped with it | |
| 5 # blank, causing the FT2232H chip to take its default VID:PID. | |
| 6 # | |
| 7 # Having this default VID:PID causes undesirable behavior under Linux: a pair | |
| 8 # of ttyUSB devices is created upon plug-in, but the first of these two then | |
| 9 # disappears when the developer runs iceprog to manipulate FPGA programming, | |
| 10 # creating a gap in ttyUSB device numbers. And even if you are working with a | |
| 11 # stable logic design and not running iceprog, the first of the two created | |
| 12 # ttyUSB devices is still bogus, as that hardware channel is wired for MPSSE | |
| 13 # and not UART. | |
| 14 # | |
| 15 # In Falconian queendom, the solution to this problem is to program the EEPROM | |
| 16 # behind the FT2232H chip with our own image and set the USB ID to a code that | |
| 17 # tells the Linux kernel to create a ttyUSB device only for Channel B - the | |
| 18 # so-called "JTAG quirk". Falconia Partners LLC got a block of 8 PIDs | |
| 19 # officially allocated to us by FTDI, and since 2020-09 the mainline Linux | |
| 20 # kernel recognizes two of them as JTAG quirks. Use one of those two PIDs. | |
| 21 | |
| 22 vid 0x0403 # FTDI | |
| 23 pid 0x7150 # Allocated by FTDI to Falconia, JTAG quirk in Linux | |
| 24 | |
| 25 manuf Lattice | |
| 26 product ICE40HX1K-STICK-EVN |