To write the FT4232H serial EEPROM is required an utility included in the libftdi library starting from its version 1.4 or higher.
These are the steps to follow to install this utility starting from a fresh Raspbian distribution:
Install the required packages:
sudo apt-get update sudo apt-get install libconfuse-dev libboost-dev libusb-1.0.0-dev swig cmake
Download the latest sources version of libftdi library:
wget https://www.intra2net.com/en/developer/libftdi/download/libftdi1-1.4.tar.bz2 tar -xvjf libftdi1-1.4.tar.bz2 cd libftdi1-1.4
Launch the source building by typing the follow commands:
mkdir build cd build cmake -DCMAKE_INSTALL_PREFIX="/usr" ../ make sudo make install
At this point we have the utility ftdi_eeprom compiled and ready to be used to write the serial EEPROM with the configuration file we need.
Create a text file called cm3home.conf with this contents:
# CM3-HOME EEPROM configuration for FT4232H vendor_id=0x0403 # Vendor ID product_id=0x6011 # Product ID eeprom_type=0x56 max_power=0 # Max. power consumption: value * 2 mA. Use 0 if self_powered = true. # Strings manufacturer="Acme Systems srl" # Manufacturer product="CM3-Home board" # Product serial="1234" # Serial # Options self_powered=true # Turn this off for bus powered remote_wakeup=false # Turn this on for remote wakeup feature use_serial=true # Use the serial number string # Normally out don't have to change one of these flags in_is_isochronous=false # In Endpoint is Isochronous out_is_isochronous=false # Out Endpoint is Isochronous suspend_pull_downs=false # Enable suspend pull downs for lower power change_usb_version=false # Change USB Version usb_version=0x0200 # Only used when change_usb_version is enabled cha_type=UART chb_type=UART cha_vcp=true chb_vcp=true chc_vcp=true chd_vcp=true cha_rs485=true chb_rs485=true chc_rs485=true chd_rs485=true # Filename, leave empty to skip file writing filename="cm3home.bin"
Use this file to create a binary image to transfer to the EEPROM by typing:
sudo ftdi_eeprom --build-eeprom cm3home.conf FTDI eeprom generator v0.17 (c) Intra2net AG and the libftdi developers <firstname.lastname@example.org> FTDI read eeprom: 0 EEPROM size: -1 Used eeprom space: 238 bytes Writing to file: cm3home.bin FTDI close: 0
The output file generated is cm3home.bin.
Delete the previous EEPROM contents with this command:
sudo ftdi_eeprom --erase-eeprom cm3home.conf
Then write the new contents:
sudo ftdi_eeprom --flash-eeprom cm3home.conf
If everything has gone well should be possible to see the following messages generated by the Kernel after the FT4232H reset.
dmesg [ 1381.461766] usb 1-1.5: new high-speed USB device number 5 using dwc_otg [ 1381.596326] usb 1-1.5: New USB device found, idVendor=0403, idProduct=6011 [ 1381.596333] usb 1-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1381.596337] usb 1-1.5: Product: CM3-Home board [ 1381.596341] usb 1-1.5: Manufacturer: Acme Systems srl [ 1381.596345] usb 1-1.5: SerialNumber: 1234 [ 1381.598522] ftdi_sio 1-1.5:1.0: FTDI USB Serial Device converter detected [ 1381.598648] usb 1-1.5: Detected FT4232H [ 1381.598968] usb 1-1.5: FTDI USB Serial Device converter now attached to ttyUSB0 [ 1381.600792] ftdi_sio 1-1.5:1.1: FTDI USB Serial Device converter detected [ 1381.600871] usb 1-1.5: Detected FT4232H [ 1381.601133] usb 1-1.5: FTDI USB Serial Device converter now attached to ttyUSB1 [ 1381.607429] ftdi_sio 1-1.5:1.2: FTDI USB Serial Device converter detected [ 1381.607534] usb 1-1.5: Detected FT4232H [ 1381.607853] usb 1-1.5: FTDI USB Serial Device converter now attached to ttyUSB2 [ 1381.609659] ftdi_sio 1-1.5:1.3: FTDI USB Serial Device converter detected [ 1381.609733] usb 1-1.5: Detected FT4232H [ 1381.609981] usb 1-1.5: FTDI USB Serial Device converter now attached to ttyUSB3
It is possible to check the strings saved inside the EEPROM also by typing:
cat /sys/bus/usb/devices/*/manufacturer cat /sys/bus/usb/devices/*/product cat /sys/bus/usb/devices/*/serial
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