here's what's happening. f11 x86_64 updated beta, connected to an
embedded (beagleboard) system thusly:
host USB port <->
regular USB cable <->
targus port replicator with serial port <->
null modem cable <->
everex PC AT cable (DB9 to 10-pin connector)
works fine -- minicom at 115200 8N1, no flow control, and device file
/dev/ttyUSB0. when i plug it in, my host /var/log/messages appears
thusly:
ay 8 19:47:19 localhost kernel: usb 2-1.4: new full speed USB device
using ohci_hcd and address 74
May 8 19:47:19 localhost kernel: usb 2-1.4: New USB device found,
idVendor=0711, idProduct=0230
May 8 19:47:19 localhost kernel: usb 2-1.4: New USB device strings:
Mfr=1, Product=2, SerialNumber=3
May 8 19:47:19 localhost kernel: usb 2-1.4: Manufacturer: USB-RS232
Interface Converter
May 8 19:47:19 localhost kernel: usb 2-1.4: SerialNumber: 204395
May 8 19:47:19 localhost kernel: usb 2-1.4: configuration #1 chosen
from 1 choice
May 8 19:47:19 localhost kernel: mct_u232 2-1.4:1.0: MCT U232
converter detected
May 8 19:47:19 localhost kernel: usb 2-1.4: MCT U232 converter now
attached to ttyUSB0
May 8 19:47:19 localhost NetworkManager: <info> (ttyUSB0): ignoring
due to lack of mobile broadband capabilties
looks good, and i'm connected to the console on the beagle board.
what i want to do now is replace the clunky targus port replicator
with a USB-serial converter to give me:
host USB port <->
no-name USB-serial converter cable <->
null modem cable <->
everex PC AT cable (DB9 to 10-pin connector)
but i've yet to get that to work properly. when i plug in the
converter, i get:
May 8 19:57:21 localhost kernel: usb 2-1: new full speed USB device
using ohci_hcd and address 78
May 8 19:57:22 localhost kernel: usb 2-1: New USB device found,
idVendor=067b, idProduct=2303
May 8 19:57:22 localhost kernel: usb 2-1: New USB device strings:
Mfr=1, Product=2, SerialNumber=0
May 8 19:57:22 localhost kernel: usb 2-1: Product: USB-Serial
Controller
May 8 19:57:22 localhost kernel: usb 2-1: Manufacturer: Prolific
Technology Inc.
May 8 19:57:22 localhost kernel: usb 2-1: configuration #1 chosen
from 1 choice
May 8 19:57:22 localhost kernel: pl2303 2-1:1.0: pl2303 converter
detected
May 8 19:57:22 localhost kernel: usb 2-1: pl2303 converter now
attached to ttyUSB0
May 8 19:57:22 localhost NetworkManager: <info> (ttyUSB0): ignoring
due to lack of mobile broadband capabilties
except that what i see in minicom is crap -- lots of unprintable
characters, as if it's running at the wrong baud rate or something. i
didn't do anything special when i plugged in the converter, and here's
the first few lines from "modinfo pl2303":
filename:
/lib/modules/2.6.29.2-129.fc11.x86_64/kernel/drivers/usb/serial/pl2303.ko
license: GPL
description: Prolific PL2303 USB to serial adaptor driver
srcversion: EF203DC966F54AFA826B33F
...
is there a known issue with USB-serial converters? i just noticed
that that module has a single load-time parameter:
debug:Debug enabled or not (bool)
so i guess i can try that next and see what happens. but i was
expecting this to work right out of the box, as they say.
rday
--
========================================================================
Robert P. J. Day Waterloo, Ontario, CANADA
Linux Consulting, Training and Annoying Kernel Pedantry.
Web page: http://crashcourse.ca
Linked In: http://www.linkedin.com/in/rpjday
Twitter: http://twitter.com/rpjday
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