• Mychaela N. Falconia's avatar
    USB: serial: ftdi_sio: add support for FreeCalypso JTAG+UART adapters · 6cf87e5e
    Mychaela N. Falconia authored
    There exist many FT2232-based JTAG+UART adapter designs in which
    FT2232 Channel A is used for JTAG and Channel B is used for UART.
    The best way to handle them in Linux is to have the ftdi_sio driver
    create a ttyUSB device only for Channel B and not for Channel A:
    a ttyUSB device for Channel A would be bogus and will disappear as
    soon as the user runs OpenOCD or other applications that access
    Channel A for JTAG from userspace, causing undesirable noise for
    users.  The ftdi_sio driver already has a dedicated quirk for such
    JTAG+UART FT2232 adapters, and it requires assigning custom USB IDs
    to such adapters and adding these IDs to the driver with the
    ftdi_jtag_quirk applied.
    
    Boutique hardware manufacturer Falconia Partners LLC has created a
    couple of JTAG+UART adapter designs (one buffered, one unbuffered)
    as part of FreeCalypso project, and this hardware is specifically made
    to be used with Linux hosts, with the intent that Channel A wil...
    6cf87e5e
ftdi_sio_ids.h 58.6 KB