calin 4 Posted July 26, 2012 Share Posted July 26, 2012 It seems that something bad has happened with latest kernel on linux - at least on the version I am using. Looks like the cdc_acm driver is completely busted in the latest version. See bellow logs .. Does anyone has this issue? I am 100% is not the launchpad, works under Windowz. Also I am 10% is not something stupid like permissions . I want to check first, if anyone else has it then I-ll ding the linuxusb-dev group to check with them. I use Ubuntu 12.04 64 bit - uname = Linux obellix 3.2.0-27-generic #43-Ubuntu SMP Fri Jul 6 14:25:57 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux The picocom session is this calin@obellix:~$ sudo picocom /dev/ttyACM0 picocom v1.4 port is : /dev/ttyACM0 flowcontrol : none baudrate is : 9600 parity is : none databits are : 8 escape is : C-a noinit is : no noreset is : no nolock is : no send_cmd is : ascii_xfr -s -v -l10 receive_cmd is : rz -vv FATAL: cannot open /dev/ttyACM0: Input/output error The FATAL matches the "tty_port_close_start: tty->count = 1 port count = 0." in dmesg . Jul 25 23:04:05 obellix kernel: [ 3635.690997] usb 7-1: new full-speed USB device number 5 using uhci_hcd Jul 25 23:04:05 obellix kernel: [ 3635.902227] cdc_acm 7-1:1.0: This device cannot do calls on its own. It is not a modem. Jul 25 23:04:05 obellix kernel: [ 3635.902232] cdc_acm 7-1:1.0: No union descriptor, testing for castrated device Jul 25 23:04:05 obellix kernel: [ 3635.902251] cdc_acm 7-1:1.0: ttyACM0: USB ACM device Jul 25 23:04:15 obellix kernel: [ 3645.949792] generic-usb 0003:0451:F432.000C: usb_submit_urb(ctrl) failed Jul 25 23:04:15 obellix kernel: [ 3645.949805] generic-usb 0003:0451:F432.000C: timeout initializing reports Jul 25 23:04:15 obellix kernel: [ 3645.950374] generic-usb 0003:0451:F432.000C: hiddev0,hidraw2: USB HID v1.01 Device [Texas Instruments Texas Instruments MSP-FET430UIF] on usb-0000:00:1d.1-1/input1 Jul 25 23:07:09 obellix kernel: [ 3820.261188] tty_port_close_start: tty->count = 1 port count = 0. Quote Link to post Share on other sites
calin 4 Posted July 26, 2012 Author Share Posted July 26, 2012 I think I may have answered my own question ... Clearly something is hosed with the cdc_acm module. Just after posting I realized that I still have around few older kernels on my machine. So a quick reboot into Linux obellix 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux and I managed to connect successfully, then plug unplug killed the serial again. bluehash 1 Quote Link to post Share on other sites
jsolarski-backup 22 Posted July 30, 2012 Share Posted July 30, 2012 If you have dkms installed, there is a patch floating around on this site that fixes the serial issue and may fix your hosed driver without recompiling your entire kernel calin 1 Quote Link to post Share on other sites
calin 4 Posted July 30, 2012 Author Share Posted July 30, 2012 Man thanks for the tip .. I built the patched kernel module and the UART works a treat now. BTW here is the link to the thread that has the references to the patch. http://www.43oh.com/forum/viewtopic.php?f=38&t=2866#p21040 The link to the file is http://www8.zippyshare.com/v/10251460/file.html - if you have to re-build the module make sure you do first a dos2unix on all files - looks like the zip was created on Windows and all endlines are "broken" in the driver files. In rest all good Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.