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annotate eeproms/icestick @ 167:8ffcd88d40c3

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eeproms: fc-jtag gives way to jtagbuf
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 31 Jul 2023 00:34:38 +0000
parents 7a4e8d23ab3a
children
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7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 # Lattice iCEstick FPGA board features an FT2232H chip, with Channel A wired
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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2 # for MPSSE mode (access to SPI flash and FPGA configuration controls) and
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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3 # Channel B wired as a UART for user logic implemented in the FPGA. This
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 # FT2232H subsystem includes a 93C56 EEPROM, but boards are shipped with it
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 # blank, causing the FT2232H chip to take its default VID:PID.
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 #
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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7 # Having this default VID:PID causes undesirable behavior under Linux: a pair
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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8 # of ttyUSB devices is created upon plug-in, but the first of these two then
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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9 # disappears when the developer runs iceprog to manipulate FPGA programming,
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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10 # creating a gap in ttyUSB device numbers. And even if you are working with a
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 # stable logic design and not running iceprog, the first of the two created
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 # ttyUSB devices is still bogus, as that hardware channel is wired for MPSSE
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 # and not UART.
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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14 #
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 # In Falconian queendom, the solution to this problem is to program the EEPROM
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 # behind the FT2232H chip with our own image and set the USB ID to a code that
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 # tells the Linux kernel to create a ttyUSB device only for Channel B - the
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 # so-called "JTAG quirk". Falconia Partners LLC got a block of 8 PIDs
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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19 # officially allocated to us by FTDI, and since 2020-09 the mainline Linux
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 # kernel recognizes two of them as JTAG quirks. Use one of those two PIDs.
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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21
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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22 vid 0x0403 # FTDI
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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23 pid 0x7150 # Allocated by FTDI to Falconia, JTAG quirk in Linux
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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24
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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25 manuf Lattice
7a4e8d23ab3a eeproms/icestick: programming for Lattice Icestick
Mychaela Falconia <falcon@freecalypso.org>
parents:
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26 product ICE40HX1K-STICK-EVN