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doc/DUART28-EEPROM-config: update for fc-duart28-conf
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 11 Sep 2023 01:06:03 +0000 |
parents | 434806360d91 |
children | d46ea7a3fa0c |
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# This EEPROM configuration is meant to be programmed into COTS FT2232D # breakout boards used as unbuffered JTAG adapters. The custom USB VID:PID # belongs to Falconia Partners LLC; we hereby allow the community to program # this PID into generic FT2232D boards (not made by Falconia) as long as # it is used for the present purpose with this full EEPROM configuration. # # The purpose of having a custom USB ID is to prevent the Linux kernel # ftdi_sio driver from treating this FT2232D instance as a dual UART and # creating a ttyUSB device for Channel A. If you wish to use Channel B # as a UART (which is still available for that purpose), you will need to use # a Linux kernel version with commit 6cf87e5edd9944e1d3b6efd966ea401effc304ee # included, or apply that commit locally if your kernel version does not # include it. vid 0x0403 # FTDI pid 0x7151 # Allocated by FTDI to Falconia Partners LLC manuf FTDI product Unbuffered JTAG adapter # We program Channel A to come up in the 245 FIFO mode prior to being # switched into MPSSE mode by OpenOCD, as opposed to the default 232 UART mode. # If the FT2232D chip's ADBUS pins are connected directly to the JTAG target # without a buffer (what we mean by an unbuffered JTAG adapter), the default # 232 UART mode is NOT safe, as it will produce a fight on the ADBUS2 line # between the UART RTS output and the target's TDO output. 245 FIFO mode is # expected to be safer, as all 8 ADBUS lines will be inputs for as long as # the ACBUS2 line is left unconnected and not driven by anything. byte00 0x01 # Channel A: FIFO mode, D2XX driver byte01 0x08 # Channel B: UART mode, VCP driver