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FYI: Linux is a joy . For those who might have issues with the CYW43907AEVAL1F being recognized as two ttyUSB ports, this might be helpful.
Background: Things were working fine with my Linux Mint 19 PC, though there is a console fonts issue (another story not yet resolved).
I reinstalled Linux Mint 19 on my PC. After the reinstall, the FTDI FT2232H USB chip was not visible on /dev/ttyUSB0/1 anymore. I entered "dmesg" to see that "Broadcom" was recognized, but no serial ports.
I did find a workaround as follows (with help from https://ubuntuforums.org/showthread.php?t=2259068 😞
sudo modprobe ftdi_sio idVendor=0x0a5c idProduct=0x43fa
(When I plug in the board, I see via the command "dmesg":
New USB device found, idVendor=0a5c, idProduct=43fa, bcdDevice= 7.00)
2. Enter (per the recommended workaround, above):
sudo chmod 666 /sys/bus/usb-serial/drivers/ftdi_sio/new_id
3. Use a text editor to edit a new file:
Add only these two numbers to the file (i.e., the idVendor and idProduct):
Then save it.
4. Enter (if not already done, I think this needs to be done only once):
sudo usermod -a -G dialout your_user_name
5. Plug in the board, and verify:
dmesg | grep tty
You should see something like:
[ 45.511352] usb 2-2: FTDI USB Serial Device converter now attached to ttyUSB0
[ 45.511672] usb 2-2: FTDI USB Serial Device converter now attached to ttyUSB1
Now, I need to do this after each reboot since the file "new_id" does not appear to be saved.
I use the serial program "moserial" to connect to ttyUSB1, and I can see serial activity now.
I might need to unplug/plug in the board if download fails.
I hope this helps someone out there.