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7
votes
1answer
127 views

Why does 8250 UART driver not wake up TTY if more than 256 characters are pending?

What is the motivation of this if-condition in void serial8250_tx_chars(struct uart_8250_port *up)? if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port); It has been ...
3
votes
1answer
461 views

Output shutdown messages to multiple consoles

I have configured my system to direct console output on boot to serial and vga using kernel parameters. Serial is the last argument in the kernel parameters and will be the default used for /dev/...
2
votes
1answer
359 views

FreeBSD gettytab configuration

I have a serial port on my system which is named cuau3 under FreeBSD. I want to change the properties of this port, I can change the device's speed using /etc/ttys and /etc/gettytab files, but I can't ...
1
vote
1answer
29 views

access to ttyusb0 as normal user

I am trying to access a serial device, which is attached as: "/dev/ttyUSB0". crw-rw---- 1 root dialout 188, 0 Nov 29 15:45 ttyUSB0 For that I created a new udev rule: SUBSYSTEM=="tty", ATTR{...
1
vote
1answer
327 views

_Robust_ bluetooth serial port console/tty

I've managed to create and connect to a console via bluetooth, as is described in many Q&A's FAQs Guides etc found via a google search. Briefly, in sudo mode, /usr/sbin/hciconfig hci0 piscan /...
1
vote
1answer
166 views

problem with U-boot while flashing Linux in sd-card

Please help as it is immense necessary for a project which is to be evaluated coming week. Also, I am very new to this and unable to find help from existing contents available on the Internet. While ...
1
vote
1answer
319 views

Serial communication not working in both directions

I am working with a SOM mounted on a carrier board running Ubuntu 14.04 with the generic 3.13 kernel. While testing out the peripherals, I hit a problem with serial communication. Basically, I can ...
1
vote
1answer
442 views

VT100 terminal emulation to use with a Java-based 8-bit computer emulator

I'm successfully using GNU Screen as serial terminal to "talk" to my Altair 8800 clone (http://altairclone.com/) using serial line. The command I use is: screen -istrip /dev/ttyUSB0 Screen does the ...
1
vote
1answer
171 views

unable to establish communication using grabserial

I have use teraterm in past and it works fine. I can see log messages coming from my board. Ultimately I reach the login prompt where I enter my login and password for OS running on my board. Now ...
0
votes
1answer
31 views

Is there any tool in linux which will help me specify baud rate which i need

I have tried gtkterm and a couple of other tools. None of them seem to support a baud rate which is higher than 115200. Could someone suggest some tools which will allow higher baud rates?
0
votes
1answer
85 views

Ctrl + Alt + Del and F keys Using Telnet

I only have serial access to a server, and I am trying to access its BIOS using telnet (it's not a direct serial, but a remote serial connection). My telnet certainly reaches the server, as I can ...
3
votes
0answers
333 views

Increasing serial baud rate within Ubuntu under VirtualBox

I'm debugging a kernel module under VirtualBox with a guest and host OS as Ubuntu 10.10. I'm using the virtualbox serial port but I'm maxing out at the baudrate 115200. My grub config looks like this.....
2
votes
0answers
41 views

How to assign different configuration for ttyS0 under different environments

I have a computer (let's call it as DevPC) that sometimes run Linux in native environment and that sometimes run Linux on Xen. I connect this computer to another computer (let's call it as MonitorPC) ...
2
votes
0answers
146 views

Working /dev/ttyS0 but can't transfer binary (one serial but two drivers Com1/Com4)

I think it's a driver config issue, it works in winXP(dual boot) with intel drivers. I'm debugging via serial port from another machine, which works fine. The PC is a i5 dell Optiplex 790 running ...
2
votes
0answers
756 views

cat /dev/ttyS0 Input/output error

I created infrared receiver as in LIRC manual (http://www.lirc.org/receivers.html). And tested it on windows using program called Terminal. When I switched on RTS pin DCD pin was also switched on ...
2
votes
0answers
488 views

Kicking a process from a USB-Serial port

I have a application which is using the USB-serial port. Occasionally on shutdown the port cannot be opened by another instance of the program, and up until now the only way I know of the program ...
1
vote
0answers
83 views

Unable to get login prompt on /dev/ttyUSB0

I am attempting to connect a TI-89 graphing calculator as a serial terminal to a Raspberry Pi running the latest version of Raspbian. The calculator is emulating a PL2303 serial adapter at /dev/...
1
vote
0answers
115 views

beagleboard com and HDMI dispaly

I've installed Ubuntu 11.10,lkde and gem on my BB and I connect to it through serial com. when trying GUI application through the com (e.g. gedit) I get "display not found, though a monitor is ...
0
votes
0answers
81 views

No response on ttyAMA0 on ArchLinux

I am running ArchLinux on a Raspberry Pi 3. I am trying to connect over a serial cable with screen on a Mac El Captain using screen /dev/tty.usbserial 115200. I get the Grub boot messages and the ...
0
votes
0answers
92 views

QEMU kernel panic to serial port

I'm working with kernel 2.6.13.1 on Debian 6 with QEMU/KVM for a class. The kernel, once installed, panics on boot. The curses interface to qemu doesn't seem to allow scrollback to view the entire ...
0
votes
0answers
99 views

Getty crashes when I attempt to open a serial terminal

I started a getty console on my serial port on a raspberry pi compute module running Raspian by configuring the following line in /boot/cmdline.txt: dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=...
0
votes
0answers
65 views

When connecting with GNU Screen (patched version) RPi reprompts for password in kind of loop

I'm sorry this is a repost of my question on raspberrypi.stackexchange.com, but I didn't get an answer there, so I thought I could post it here. If not, please suggest some other way to get help. I ...