[opensuse] serial -> USB converter on openSUSE 11.2
- From: Roger Oberholtzer <roger@xxxxxx>
- Date: Mon, 19 Apr 2010 12:08:45 +0200
I have connected a serial -> USB converter cable between a remote serial
port and the local USB. I am trying to set the baud rate and all. See
Background: later in the message for more details. Something looks
wrong. I do not get any data. Here I have listed the steps for this as I
see it:
I see the 4 devices from lsusb:
Bus 002 Device 006: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 002 Device 007: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 002 Device 008: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 002 Device 009: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
The kernel modules are loaded automatically (from lsmod):
ftdi_sio 52936 4
usbserial 40904 9 ftdi_sio
The ftdi_sio module lists the USB IDs as a recognized alias (from
modinfo):
alias: usb:v0403p6001d*dc*dsc*dp*ic*isc*ip*
The four devices show up as:
crw-rw---- 1 root dialout 188, 0 2010-04-19 10:27 /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 1 2010-04-19 10:27 /dev/ttyUSB1
crw-rw---- 1 root dialout 188, 2 2010-04-19 10:27 /dev/ttyUSB2
crw-rw---- 1 root dialout 188, 3 2010-04-19 10:27 /dev/ttyUSB3
I am a member of the dialout group. I am running an application that I
have used with serial ports to great effect. It is accessing these
devices (lsof):
wish 5103 rst 4u CHR 188,0 0t0 4838 /dev/ttyUSB0
wish 5108 rst 4u CHR 188,3 0t0 4854 /dev/ttyUSB3
wish 5115 rst 4u CHR 188,2 0t0 4868 /dev/ttyUSB2
wish 5120 rst 4u CHR 188,1 0t0 4882 /dev/ttyUSB1
The program sets the devices to be 38400 baud, no parity, one stop bit.
Oddly, nothing is arriving on the port. So, I thought I would check with
setserial that the port settings are as expected.
setserial -g /dev/ttyUSB*
/dev/ttyUSB0, UART: unknown, Port: 0x0000, IRQ: 0, Flags: low_latency
/dev/ttyUSB1, UART: unknown, Port: 0x0000, IRQ: 0, Flags: low_latency
/dev/ttyUSB2, UART: unknown, Port: 0x0000, IRQ: 0, Flags: low_latency
/dev/ttyUSB3, UART: unknown, Port: 0x0000, IRQ: 0, Flags: low_latency
Is this what setserial should report for this type of serial port? Maybe
it does not work with USB serial ports?
Background:
I am trying to diagnose a Linux kernel boot problem with a diskless
openSUSE 11.2 system at a remote location. I have used the ever popular
kernel command line option on the remote:
console=ttyS1,38400n8 splash=0 textmode=1
This has always worked for me. The person at the remote tells me that
all listing on the console stops just when I would expect it to. So I am
fairly certain the kernel is sending the data on the serial port. The
serial port is connected to another openSUSE computer next to it. I am
logged in to that one from a remote computer and running the serial port
monitor (wish).
But nothing arrives. The setserial listing is mysterious. Anyone used
these sorts of devices?
--
Roger Oberholtzer
OPQ Systems / Ramböll RST
Ramböll Sverige AB
Krukmakargatan 21
P.O. Box 17009
SE-104 62 Stockholm, Sweden
Office: Int +46 10-615 60 20
Mobile: Int +46 70-815 1696
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