Linux/FTDI

FTDI Programming
apt install ftdi-eeprom

modprobe -r ftdi_sio ftdi_eeprom --read-eeprom asmith.conf

modprobe ftdi_sio tio /dev/ttyUSB0

udevadm info -a -p $(udevadm info -q path -n /dev/ttyUSB0) | less

ATTRS{idProduct}=="6011" ATTRS{idVendor}=="0403"

---

mydevice.conf: vendor_id=0x0403 product_id=0x6011

max_power=0

manufacturer="Aznot" product="Aznot Device" serial="1944d0021"

filename="eeprom.new"

---


 * 1) ftdi_eeprom --read-eeprom test.conf

FTDI eeprom generator v0.17 (c) Intra2net AG and the libftdi developers  FTDI read eeprom: 0 EEPROM size: 128 FTDI close: 0

---


 * 1) ftdi_eeprom --erase-eeprom asmith.conf

FTDI eeprom generator v0.17 (c) Intra2net AG and the libftdi developers  FTDI read eeprom: 0 EEPROM size: -1 FTDI erase eeprom: 0 Used eeprom space: 224 bytes Writing to file: eeprom.new FTDI close: 0

---


 * 1) ftdi_eeprom --flash-eeprom asmith.conf

FTDI eeprom generator v0.17 (c) Intra2net AG and the libftdi developers  FTDI read eeprom: 0 EEPROM size: -1 Used eeprom space: 96 bytes FTDI write eeprom: 0 Writing to file: eeprom.new FTDI close: -1

---


 * 1) ftdi_eeprom --flash-eeprom asmith.conf

FTDI eeprom generator v0.17 (c) Intra2net AG and the libftdi developers  FTDI read eeprom: 0 EEPROM size: 256 Used eeprom space: 224 bytes FTDI write eeprom: 0 Writing to file: eeprom.new FTDI close: 0

---

[18849.738246] usb 1-5: new high-speed USB device number 6 using xhci_hcd [18849.880956] usb 1-5: New USB device found, idVendor=0403, idProduct=6011 [18849.880957] usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [18849.880958] usb 1-5: Product: Aznot Device [18849.880959] usb 1-5: Manufacturer: Aznot [18849.882541] ftdi_sio 1-5:1.0: FTDI USB Serial Device converter detected [18849.882555] usb 1-5: Detected FT4232H [18849.882635] usb 1-5: FTDI USB Serial Device converter now attached to ttyUSB0 [18849.883942] ftdi_sio 1-5:1.1: FTDI USB Serial Device converter detected [18849.883953] usb 1-5: Detected FT4232H [18849.884028] usb 1-5: FTDI USB Serial Device converter now attached to ttyUSB1 [18849.885338] ftdi_sio 1-5:1.2: FTDI USB Serial Device converter detected [18849.885349] usb 1-5: Detected FT4232H [18849.885423] usb 1-5: FTDI USB Serial Device converter now attached to ttyUSB2 [18849.886763] ftdi_sio 1-5:1.3: FTDI USB Serial Device converter detected [18849.886779] usb 1-5: Detected FT4232H [18849.886866] usb 1-5: FTDI USB Serial Device converter now attached to ttyUSB3

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that means that the EEPROM is erased (all 0xff); see ftdi_read_eeprom in ftdi.c: "Guesses size of eeprom ... will not work with blank eeprom"

> Checksum Error: aaaa 0000 > Malloc failed, aborting

these errors follow from EEPROM size being -1

with an erased EEPROM the FTDI chip falls back to the default vendor:product (which is 0403:6011)

ref:

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Source:

https://chromium.googlesource.com/chromiumos/third_party/libftdi/+/b790d38e9fac3e2144293a84bfc6de72b01a6c6d/src/ftdi.c

UDEV
See Linux/udev