Gene Heskett wrote:
> greetings all;
>
> Since updating to stretch, udev has been randomly swapping ttyUSB0 and
> ttyUSB1 and sometimes ttyUSB2 around, confusing the hell out of heyu, a
> trs-80-coco3, and occasionally even nut. Nut (apc ups) is not on a
> usb-serial adapter, it just a usb cable but the other 2 are on
> individually unique FTDI adaptors.
>
> What udev persistent file, and where is it, do I edit and chattr +i to
> effect a permanent cure for this apparently random device renaming?
>
> And whats the command to restart udev from a clean slate without
> rebooting?
>
> These are the ttyUSB ports that need persistent names:
>
> root@coyote:rules.d$ usb-devices|grep -C4 SERIAL
> T: Bus=01 Lev=01 Prnt=01 Port=09 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
> D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
> P: Vendor=0403 ProdID=6001 Rev=04.00
> S: Manufacturer=FTDI
> S: Product=USB HS SERIAL CONVERTER
> S: SerialNumber=FTDHG45D
> C: #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=44mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=ftdi_sio
>
> --
> T: Bus=01 Lev=02 Prnt=04 Port=02 Cnt=02 Dev#= 7 Spd=12 MxCh= 0
> D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
> P: Vendor=0403 ProdID=6001 Rev=06.00
> S: Manufacturer=FTDI
> S: Product=USB FAST SERIAL ADAPTER
> S: SerialNumber=FTOOS09N
> C: #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=ftdi_sio
udevinfo -a -p $(udevinfo -q path -n /dev/ttyUSB0) # will get
you the list of attributes you can match on
Then in /etc/udev/rules.d/ you want a file that says things
like:
SUBSYSTEM=="usb", ATTR{idVendor}=="0403", ATTR{idProduct}=="6001",
ATTR{idSerialNumber="FTDHG45D" SYMLINK+="ttyUSB0", GROUP="serial"
SUBSYSTEM=="usb", ATTR{idVendor}=="0403", ATTR{idProduct}=="6001",
ATTR{idSerialNumber="FTTOOS09N", SYMLINK+="ttyUSB1", GROUP="serial"
ATTR{idSerialNumber} will be crucial, but it might not be
labeled that way - check with the udevinfo statement above.
Change GROUP as desired.
-dsr-
