Software :: Disable GRUB Serial Communications?
Sep 2, 2010
I have two linux boxes A and B. Each of them have serial ports (ttyS0 on both) and these ports are connected using null modem serial cable. "A" box is always on and it has getty process on its ttyS0 (I need this getty for serial communication). If I reboot box B, it doesn't boot default entry - just displays grub os select table. After some investigation I realized that getty process on A sends some data to grub on B while it's booting and grub behaves the same way as if some key is pressed during timeout period - it doesn't boot default and waits for interactive user response. I need to reboot B remotely so its no good for me.
View 5 Replies
ADVERTISEMENT
May 21, 2010
I am wanting to set-up serial communications between my server (ubuntu 9.04) and a picaxe chip (a pic with a bootloader) I need to send data in the format of "1,1,1" or "1,1,0" at 9600 baud 8 data bits, no parity, 1 stop bit and no flow control. the data must be sent as numbers not ASCII I have tried
Code:
echo 1,1,0 > /dev/ttyS0
Any simple shell script or even python.
View 8 Replies
View Related
Sep 15, 2010
I have an application written in C (by somebody else) monitoring a device connected to a serial port. I'm using an old laptop w. tinycore linux for an os. The app works well enough, and the communication speed is relatively slow, 9600bps, unidirectional, comes in packets of 18 bytes. The app is just picking apart the packets and displaying the contents on a formatted screen (ncurses), updating about once every 1/2 second. The trouble is, the app is polling the serial port and using *all* of the cpu bandwidth. The cpu fan runs full bore all the time.
Other activities are sluggish when the monitoring program is running. I'd like to modify the app to be a little more intelligent, use a receive buffer and interrupts to trigger processing each packet and, most importantly, not poll in a tight loop waiting for data. I'm not sure where to start, but I'm convinced this isn't that complicated of a change. Is there a good resource that would explain the basics of reading data from serial port software buffers, triggering on interrupts and suspending or sleeping when no interrupt is pending?
View 5 Replies
View Related
May 21, 2009
I am running kubuntu 9.04. I have minicom, Gtkterm and Putty installed. minicom seems to be really good, but I am missing scroll back functionality on there. Either that or I'm a novice with it and don't know how to do it. Putty is a GREAT app. But what I'm finding is that after the terminal runs for a bit, the screen shows characters from the previous lines and goofs up the output. If I move the window, the gibirish disappears. gtkterm is adding several empty lines to any of the screen output.
View 2 Replies
View Related
Jan 13, 2010
I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5).I have /sbin/agetty -L 9600 ttyS0
in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control.I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but
cat < /dev/ttyS0. just prints out weird characters from what I type.
View 3 Replies
View Related
Feb 21, 2009
On my CentOS 5.2 install I've installed a dual-port serial card based on the NetMOS 9835 chipset. I've followed the serial instructions, but everything they tell me to do is already done - see setserial outputs below. I've compared these values to the lspci output (below, NetMos card is at the bottom of the output) for the card and it appears right. Problem being, I can't use the serial ports. Oh and I did use search, and looked at every 9835-related article before posting this :)
[Code]....
View 17 Replies
View Related
Oct 9, 2015
I am hoping to be able to get an old serial-touchscreen to work with a usb/serial adapter. I had this touchscreen working some years ago on different hardware. I would like to hook it to the machine I am setting up as a multimedia host with mythtv among other things.
Following the instructions I left behind when I got this to work way back when does not work. See [URL] ....
This info is a work around to get the xserver to see the touchscreen. [URL] ....
I do know that the touchscreen works as I am able to get garbage on the screen as in the first part of my howto. But I have not had any success getting xorg to see it. I wish I had posted a copy of the xorg.conf at the time, but......
There is an issue with the current xserver in testing that I am hoping the next update (in unstable) will fix when it gets pushed to testing. That is that Code: Select all# X -configure fails with a segfault. So I am not able to generate the xorg.conf needed to get it to work. I was going to post a bugreport, that is when I found out there is an update in unstable, so I am waiting for it to get pushed at the moment.
Anyway I am hoping that I can link /dev/ttyUSB0 to /dev/tty0 and get it to work. I would like some kind of guess as to my chances of success before I go to all the work of getting the monitor hooked to the host.
View 1 Replies
View Related
Jun 21, 2011
I have a bit of a dilemma. I'm attempting to use a microcontroller to send MIDI messages over a virtual serial port. I want to (eventually) read them with Mixxx. I'm using an FTDI chip, so I get a /dev/ttyUSB0. I've tried spikenzielabs' Serial-Midi program, but it doesn't see any serial ports. NOTEMIDI looks really old and won't compile on my 10.04 LTS machine.
View 2 Replies
View Related
Mar 23, 2010
We have a new machine with RedHat enterprise 5 on it. I need to connect a serial cable to the serial port and talk to another system (old alpha system) instead of using a VT connected to the alpha.Does RedHat come with anything like Keaterm/hyperterm/etc etc?
View 3 Replies
View Related
Jan 8, 2010
I can't find a way of getting them to talk or exchange data, esp. pics.
View 2 Replies
View Related
Dec 7, 2010
I'm running Ubuntu 10.10 desktop in a VirtualBox VM on a Windows 2008 host machine. The end goal is join the the Ubuntu VM to a Windows 2008 domain. I've downloaded likewilikewise-open_5.4.0.42111-2ubuntu1.2_i386.deb se-open_5.4.0.42111-2ubuntu1.2_i386.deb to get the joining of the VM to the domain. But from this point forward, I'm completely lost.
1) How do I implement this likewise package?
2) How do I get files from my Windows 2008 host to the Ubuntu guest VM?
The likewise file is burned to a DVD. When I try to read the DVD, I get the "My Disk" icon but only one file gets displayed. In other words, the DVD the likewise file is burned to has a ton of files. Ubuntu doesn't see any of them expect one .exe file. The /etc/fstab had no entry for cdrom, so I put a line in that says
/dev/hdc /media/cdrom0 udf,iso9660 user,noauto 0 0 rebooted and that didn't do squat. There is no entry /etc/cdrom but there is directory /etc/My Disc. And I suppose that's what gets mounted because I can see one file on that disc. So then I thought, to hell with the DVD drive and I'll just get the Linux guest to see a "shared drive" on the host. I shared out a folder on the host via the Virtualbox "shared folders". But how I get the Ubuntu guest to see this shared folder is as big a mystery to me as is the creation of life.
View 1 Replies
View Related
Jan 3, 2011
A relative will soon be traveling to China to adopt a child. China is cracking down on communication tools like Skype. Some people are using Virtual Private Networks (VPN) to ensure they can communicate with families back home. I know nothing about VPNs so I have some questions.
1. Is VPN some kind of software that you can install on 2 computers to have a secure communications?
2. Is there something in Ubuntu's Software Center that I should try?
3. If China is cracking down on external communication, is VPN the best tool to ensure communication back home?
View 1 Replies
View Related
Jan 30, 2011
I'm trying to get WiFi up and running on an older desktop PC. lspci gives me the following information about the WiFi card: 00:0d.0 Ethernet controller: Atheros Communications Inc. AR2413 802.11bg NIC (rev 01) Is there an RPM package for the driver that I need? If no, what should I do to install the driver manually? The PC in question doesn't have any other form of direct internet access. It does have an Ethernet port, but the WiFi router is too far away to hook it up to the access point directly.
View 8 Replies
View Related
May 16, 2010
I've just set up an LTSP server, with all its clients on a separate subnet to my main network - the main network is 192.168.1.x, and the LTSP clients are all 192.168.2.x. My LTSP server has 2 NICs, one on each network, and is merrily forwarding normal IP traffic from the clients to the rest of the network. I have a client/server application that has a server on one machine, and clients locate and attach to it using multicast protocols. The server is on the main network, and any other machines on the network can locate and talk to the server quite happily. The LTSP clients, however, cannot - I assume because the multicast communications aren't being forwarded by the LTSP server. How I can get this working?
View 2 Replies
View Related
May 28, 2010
Can somebody tell me how to disable apic in the grub? I've already edited the grub text file and added "noapic" in the kernel line. Now is there something similar to "sudo update-grub" that I have to run (I ask because it's not saving when I reboot)? I know in ubuntu you have to run that command in order for the changes to the text file to take place in the grub. Is there a command similar to that for Fedora?
View 2 Replies
View Related
May 12, 2010
Can I disable grub while using wubi, it's annoying going through two boot loaders, especially since grub started showing a lot more partitions that what exist for some odd reason.
View 2 Replies
View Related
Aug 9, 2010
I switched from GRUB. To extlinux (but it is doesn't matter). From the following kernel update - using debian testing -, at the and of VirtualBox installation I get the this error:
View 5 Replies
View Related
May 5, 2010
I've just reinstalled 10.04 LTS, after my update from 9.10 to 10.04 made some weird errors. So everything is good now, the problems before were fixed by the reinstall.By the reinstall, grub2 were installed aswell. Before, I ran grub1 (I guess) and at bootup it didnt show the list of boot choices you have, like safe boot or other OS if you have multi boot. It just booted up and I could press ESC if I wanted the menu. That disapperead after I installed grub2, so how do I get this function back, I kinda liked it.
One more question, after the reinstall I setup the taskbar and by mistake I remove the sound control. How do I get this back, it's not in the "Add to panel" when I right click on the taskbar.
View 2 Replies
View Related
Jul 7, 2010
I'm trying to prevent users from accessing the grub menu, but setting the timeout to 0 doesn't cut it because a user can hold down ESC during boot.At the moment, it seems that my only option is to set a password for grub. But I was hopping that there is a better way where I can disable that feature completely.
View 11 Replies
View Related
Jan 11, 2011
I've found that my USB mouse causes some I/O bug BIOS, but in operation system it works fine. Problem is freezing GRUB caused by fake input from the mouse. Possible decision is disabling any input for grub, but I don't know how to do it.
View 6 Replies
View Related
Feb 7, 2009
I just started using linux (newb) on a dual boot with windows VISTA. I need to disable data prevention execution whenever I do boot Vista through GRUB but I don't know what command to use nor exactly where to put the command.On a single boot windows machine, all you would do is type the following at the command prompt and reboot: bcdedit.exe /set {current} nx AlwaysOffAlso, GRUB lists my VISTA boot option simply as "other." Is there a way to change that?
View 3 Replies
View Related
May 5, 2011
having used SuSE Linux ever since the April 1995 release, I thought installing 11.4 would be a straightforward task. Since it wasn't, I'm summarising here my experience. My PC is built around a 3-year old Asus P5B-plus mainboard, i.e. certainly not brand-new hardware.
1 - on installation, my "Atheros Communications L1 Gigabit Ethernet (rev b0)" wasn't recognized, so I had to "modprobe atl1" from one of the consoles available during installation. That worked but the installer didn't pick up the fact that network was now available.
2 - after completion of the installation, online-updating for the first time and installing the nvidia driver for my "nVidia Corporation G71 [GeForce 7300 GS] (rev a1)" the KDE desktop showed the "blank desktop with mouse pointer" syndrome. Googling yielded that desktop effects had to be disabled in the kwinrc configuration file.
3 - logging in today after an online update, firefox (MozillaFirefox-4.0.1-0.2.2.x86_64) segfaults on start-up while loading the default website (opensuse.org). firefox will run in safemode but it won't run in normal mode, even with all add-ons disabled.
Now I don't have a useable system after a couple of hours of trying. Fortunately, I have a working installation of openSUSE 11.2 but I believe that updates for that distribution will be stopped shortly.
View 7 Replies
View Related
Mar 5, 2010
I've been using Kate for a while without any problems.
However, today I tried to install Kedit.
Then I got this message:
"There was an error setting up inter-process communications for KDE. The message returned by the system was:
Could not read network connection list. /home/mikeb/.DCOPserver_XXX__0
Please check that the "dcopserver" program is running!"
Then I uninstalled Kedit, hoping that the damage would be undone.
However, Kate still shows the same message upon startup.
So I reinstalled Kate, and got the same thing.
What did the Kedit installation mess up, and how I can I fix it so I can use Kate again?
View 9 Replies
View Related
Mar 14, 2010
After making and update my Karmic Koala and trying to set up lamp through tasksell, i have rebooted my notebook. Then the ubuntu logo was displayied and i get an"Ubuntu is eunnung in low graphics mode"(EE) open /dev/fe0: No such file or dierctory.i have done some googling and figured that it has most likely to do with ubuntu tryin to using frame buffer wrongly.
View 1 Replies
View Related
Mar 19, 2010
Just wanted to share this with anyone wanting to know.If your headless server crashes, GRUB2 (at least on Ubuntu Server) is designed to force the GRUB menu to load up next time it starts up, which means you are locked out of SSH until someone physically makes a kernel selection on the PC.To prevent this do the following change to your grub.cfg file.#nano /boot/grub/grub.cfg
I was looking for a solution for this for a long time and found no hel with google. Let me know if there is a better way.I aware this file will get overwritten and need reediting if the Kernel gets updated.
View 1 Replies
View Related
Jan 24, 2011
I have Ubuntu 10.04 with Gnome. Whenever I put in a blank CD/DVD an icon on the desktop appears named "Blank CD/DVD" and a window appears asking me what I want to do with it. How do I disable the window and the icon from the desktop?
View 2 Replies
View Related
Nov 20, 2010
my Setup is Fedora 14 x64 + radeon hd 4830 i've downloaded .run package from ati site with latest driver for x64 systems. installed it, but didn't edited grub.conf becouse i didn't understood anything there (probably didn't spent enough time to get things understand) Now i've lost possibility to enter my Fedora system. during boot it lost it's modern blue boot screen (with filling drop), it was replaced by standard old boot screen with triple-color stripe. after this boot screen monitor start blinking going on and off. and on last step i'm getting "Fedora 14 boot bla bla bla something" on screen. nothing works except Ctrl+Alt+Delete. system reboots showing successful daemons shutting sequence. How can i edit grub menu from initial grub screen is it possible to it's own 'e' option or 'c' from grub command line?
View 4 Replies
View Related
Jan 6, 2010
I would like to know if there is any differences on how to install and to configure GRUB 2 in the different architectures (BIOS/IBM PC-Compatibles, EFI/MacIntel and Corebbot)? Does the Ubuntu installer automatically recognize the different architectures and install the appropriate GRUB 2 package ('grub-pc', 'grub-efi' or 'grub-coreboot' according to the arch)? Or does it just install 'grub-pc'? Is the location of GRUB 2's configuration files different depending on the arch of the computer? Or are they all located in '/boot/grub/', '/etc/grub/default' and '/etc/grub.d/', no matter the arch of the computer? Are the files' structure and options to configure GRUB 2 ('/etc/grub/default' and the scripts in '/etc/grub.d/') different depending on the arch of the computer?
View 3 Replies
View Related
Jan 3, 2010
I'm just slightly confused here, but... what the? Why does installing grub-doc remove BOTH grub-pc, and grub-common? So basically it seems like by installing grub-doc, I have uninstalled grub totally (yes, it is still there as the bootloader, but i have no way of updating it now!) from my system. What's the conflict between grub-doc and grub-pc, such that grub-pc has to be removed?
View 5 Replies
View Related
Apr 6, 2010
hi all,
How to find out server's HDD Serial no tried below command but didnt work,
#hdparm -I /dev/sda
so please help & Thanks in Advance.
View 3 Replies
View Related