Usbserial FTDI 8U232 drivers with pppd?

Has anyone got any advice on using the linux usbserial 1-2:1.0 FTDI
8U232AM drivers with pppd?

I currently have a Netcomm Roadster V.92 (AM5055) which is basically a
serial modem with a FTDI FT232BM USB to serial converter in the back.
When connected to my 2.6.3-7mdk linux box, kppp can access the modem
(/dev/usb/tts/0) and successfully dial out. However once the carrier is
detected and the pppd is spawn, pppd times out and dies. I have attached
the logs.

I also have a Netcomm Roadster II 56 Ultra which is a serial modem.
Changing only the device to /dev/ttyS0 yields successful results,
suggesting the problem lies with the FT232BM drivers and kppp. This is
verified, by using a FT232AM USB to Serial converter with the Roadster
II above, only to see exactly the same results than with the Roadster
V.92 USB.

Interesting enough while Netcomm does not support linux, they do
indicate the AM5055 will work with linux sort of suggesting someone has
had it working at some stage.

Regards,

Craig Peacock


Jul 24 20:14:35 mars kernel: drivers/usb/serial/usb-serial.c: USB Serial
support registered for Generic
Jul 24 20:14:35 mars kernel: drivers/usb/core/usb.c: registered new
driver usbserial
Jul 24 20:14:35 mars kernel: drivers/usb/serial/usb-serial.c: USB Serial
Driver core v2.0
Jul 24 20:14:35 mars kernel: drivers/usb/serial/usb-serial.c: USB Serial
support registered for FTDI SIO
Jul 24 20:14:35 mars kernel: drivers/usb/serial/usb-serial.c: USB Serial
support registered for FTDI 8U232AM Compatible
Jul 24 20:14:35 mars kernel: drivers/usb/serial/usb-serial.c: USB Serial
support registered for FTDI FT232BM Compatible
Jul 24 20:14:35 mars kernel: drivers/usb/serial/usb-serial.c: USB Serial
support registered for USB-UIRT Infrared Tranceiver
Jul 24 20:14:35 mars kernel: drivers/usb/serial/usb-serial.c: USB Serial
support registered for Home-Electronics TIRA-1 IR Transceiver
Jul 24 20:14:35 mars kernel: ftdi_sio 1-2:1.0: FTDI 8U232AM Compatible
converter detected
Jul 24 20:14:35 mars kernel: usb 1-2: FTDI 8U232AM Compatible converter
now attached to ttyUSB0 (or usb/tts/0 for devfs)


Jul 24 21:58:59 mars pppd[3016]: pppd 2.4.1 started by cpeacock, uid 501
Jul 24 21:58:59 mars pppd[3016]: using channel 5
Jul 24 21:58:59 mars pppd[3016]: Using interface ppp0
Jul 24 21:58:59 mars pppd[3016]: Connect: ppp0 <--> /dev/usb/tts/0
Jul 24 21:58:59 mars pppd[3016]: sent [LCP ConfReq id=0x1 <asyncmap 0x0>
<magic 0xf85b55d4> <pcomp> <accomp>]
Jul 24 21:59:26 mars pppd[3016]: rcvd [LCP ConfReq id=0x1 <asyncmap 0x0>
<magic 0xf85b55d4> <pcomp> <accomp>]
Jul 24 21:59:26 mars pppd[3016]: sent [LCP ConfNak id=0x1 <magic
0xa0fed719>]
Jul 24 21:59:26 mars pppd[3016]: rcvd [LCP ConfNak id=0x1 <magic
0xa0fed719>]
Jul 24 21:59:26 mars pppd[3016]: sent [LCP ConfReq id=0x2 <asyncmap 0x0>
<magic 0xc2c427cd> <pcomp> <accomp>]
Jul 24 21:59:26 mars pppd[3016]: rcvd [LCP ConfReq id=0x2 <asyncmap 0x0>
<magic 0xc2c427cd> <pcomp> <accomp>]

…

Jul 24 21:59:26 mars pppd[3016]: sent [LCP ConfNak id=0x9 <magic
0x6124349a>]
Jul 24 21:59:26 mars pppd[3016]: rcvd [LCP ConfNak id=0x9 <magic
0x6124349a>]
Jul 24 21:59:26 mars pppd[3016]: sent [LCP ConfReq id=0xa <asyncmap 0x0>
<magic 0xd76b3f49> <pcomp> <accomp>]
Jul 24 21:59:26 mars pppd[3016]: rcvd [LCP ConfReq id=0xa <asyncmap 0x0>
<magic 0xd76b3f49> <pcomp> <accomp>]
Jul 24 21:59:26 mars pppd[3016]: sent [LCP ConfNak id=0xa <magic
0x56697382>]
Jul 24 21:59:26 mars pppd[3016]: rcvd [LCP ConfNak id=0xa <magic
0x56697382>]
Jul 24 21:59:26 mars pppd[3016]: Serial line is looped back.
Jul 24 21:59:26 mars pppd[3016]: sent [LCP TermReq id=0xb "Loopback
detected"]
Jul 24 21:59:26 mars pppd[3016]: rcvd [LCP TermReq id=0xb "Loopback
detected"]
Jul 24 21:59:26 mars pppd[3016]: sent [LCP TermAck id=0xb]
Jul 24 21:59:26 mars pppd[3016]: rcvd [LCP TermAck id=0xb]
Jul 24 21:59:26 mars pppd[3016]: Connection terminated.
Jul 24 21:59:26 mars pppd[3016]: Exit.