The use of Unix in embedded computer systems such as networking equipment, mobile phones, media players, set-top boxes, etc.

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531 views

Why isn't sda1 showing up in dev and how can I fix that?

I have an embedded Linux device and I was trying to copy some files to it. I plugged in a USB stick, the dmesg shows that it was recognized, but for some reason /dev/sda1 never showed up. I'm trying ...
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4answers
23k views

How to check password with Linux?

I want to check, from the linux command line, if a given cleartext password is the same of a crypted password on a /etc/shadow (I need this to authenticate web users. I'm running an embedded linux.) ...
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1answer
127 views

Data loss prevention ( or recovery) in a MySql db in embedded systems

I have a little ( big ) problem with a MySql application that write on a SD card or a Compact Flash. After a data loss ( a power failure , for example) , if I try to retrieve the data of my db , it ...
15
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5answers
2k views

Corruption-proof SD card filesystem for embedded Linux?

Recently we had a rather unpleasant situation with our customer - Raspberry Pi based "kiosk" used to display remote sensing data (nothing more fancy than a kiosk mode browser displaying a ...
3
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1answer
34 views

What is the complementary command to 'rx' for xmodem transfer?

I have an installation of busybox on an embedded linux system that comes with a great little utility called rx: rx FILE Receive a file using the xmodem protocol This is perfect for transferring ...
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0answers
17 views

How well is Debian supported on MIPS these days?

I am doing a new embedded Linux design, and am thinking of using a MIPS CPU. All my previous designs have used ARM. On the most recent ARM design we installed Debian ARM-HF which was excellent. My ...
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1answer
1k views

Debian and Systemd: breaking ordering cycle error

I'm a new embedded developer I'm trying to make systemd 37 work with freescale vybrid board (A5 and M4) running on linux-3.0 After boot with some breaking ordering cycle error, I check with ps ...
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1answer
11 views

Selecting IO scheduler on external drives

I'm running linux on the beaglebone black. My system is running directly from the sdcard. To change the IO scheduler I need to configure /sys/block/xxx/queue/scheduler where xxx is the mounted ...
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1answer
17 views

Nand Flash; MTD; UBI; Total Space

My question should stem from my misunderstanding of ubi and MTD. However, I can't figure it out by googling (And didn't find a good tutorial). I simply want to find out the total capacity of my Nand ...
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3answers
4k views

How to remount as read-write a specific mount of device?

How to remount as read-write a specific mount of device? (one folder) The file is "Read-only file system", rw-r-r, so it not allow to change permissions. I need to replace that file, then change ...
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4answers
3k views

Linux running on SmartTV?

I recently bought a Samsung SmartTV. After setting up the wifi connection, I surfed to http://ip.comlex.de, which gave me the following information about the browser: REMOTE_ADDR: ###.###.###.### ...
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0answers
27 views

DirectFB does not write to /dev/fb0, embedded device

I am developing a Linux based port for a custom board based off the Atmel at91sam9261-ek demo board. Processor core is arm926ej-s LCD (board customization) is VGA, 640x480, 24 bit packed true color. ...
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1answer
73 views

How to open the SSH port 22? [closed]

I have installed the ssh utility on an embedded system but I can't connect to it. I am able to ssh from the device to another computer on the network but not the other way around. The only port ...
0
votes
1answer
24 views

Monitoring network connectivity in Busybox/embedded Linux

I have an embedded Linux/Busybox system that needs to monitor its own network connectivity. I'm trying to figure out if the device is "all alone" on the network for more than say 10 minutes, and take ...
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1answer
949 views

Beaglebone Black Device Tree for LCD4 cape

The device tree for LCD4 cape is located at /lib/firmware/BB-BONE-LCD4-01-00A1.dts When I looked into it, the declaration of those GPIO buttons confuse me. There are five buttons according to ...
2
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1answer
137 views

What are the two values in < > in a device tree .dts file?

Following is the code snippet in a device tree file: flash@0 { compatible = "n25q128"; reg = <0x0>; spi-max-frequency = <50000000>; ...
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0answers
27 views

Android chroot Debian

I have a armv7l embedded device with 3 usb ports and a sd card slot. The OS of the device is android with a Debian OS in chroot. Via the Debian I can ssh into the device and breakout the chroot to ...
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1answer
730 views

How to change hard disk spin-down time on my WD MyBook Live?

I have a 2TB Western Digital MyBook Live. It works quite well and provides a web-based administration interface. There is an option to either enable or disable power saving mode, which spins down the ...
3
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2answers
684 views

Adding Buildroot Package

I'm trying to add a package to buildroot, but I'm not having much success. The package I'm trying to add is an autotools package called scew. I've followed the buildroot guidelines about adding ...
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votes
1answer
49 views

Jetson TK1 boot issues

Received my Jetson TK1 yesterday. After unboxing it and configuring the Linux GUI, rebooting the device with a mouse (cordless) attached to its USB 3.0 port takes it to some sort of Command line page ...
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1answer
27 views

ITEAD Core A20 cant load or Proceed to the FileSytem

i have an ITEAD CORE AW2041, which i wanted to deploy some image on it, i got the image on an sd card but when i deploy it on the device, the booting process gets stuck at the kernel level, any heads ...
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1answer
45 views

What's overwriting my apt sources files?

I'm working on a Phidgets SBC2. It's got emdebian grip, but grip has is over and so I get 404 on those repositories when apt-get is trying to get package lists. I can get things to install using ...
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1answer
602 views

mmcqd hangs and burns the CPU on the embedded device

On my embedded system I'm writing an intensive video stream to SD. I don't mount partitions, just write to /dev/mmcblk0p1. After a while my writing process hangs. I get [16952.240000] INFO: task ...
3
votes
1answer
40 views

Run only the Linux kernel and user programs

is it possible to run only a Linux kernel on a system which will load my programs instead of an operating system? I want to work with a Raspberry Pi with a Linux kernel. I am trying to create a ...
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0answers
72 views

ERROR: image is not a fdt - must RESET the board to recover

I am attempting to boot the freescale 1040RDB and am having some difficulty. I'm using a pre-built SDK from Freescale that has a linux VB image with the yocto installation along with all of the yocto ...
6
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1answer
403 views

Embedded linux LCD not calibrated

I have attached a new LCD to my embedded Linux device and when I run the system I found that it is shifted to the right. (the display starts from the middle of the LCD) I found 2 frame buffer drivers ...
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0answers
67 views

How to setup touch screen for X11

I am running SuSE-based embedded system with a touchscreen. The embedded application is a graphics application which uses OpenGL over X Window for graphics. We have a user-space touchscreen driver ...
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0answers
29 views

Little slow downs in Embedded Linux application

My team is working in an embedded Linux solution for a product where a center application receives and process data from the hardware and sends it to a database and to the interface application. In so ...
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1answer
357 views

F2FS vs ext3/ext4

We are using Beaglebone black Based custom board, we are planning to use eMMC in our board. We are in the process of checking different filesystem options, What are the different file system we can ...
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votes
2answers
2k views

Attaching USB-Serial device with custom PID to ttyUSB0 on embedded

I'm attempting to get an FTDI USB-Serial device with a custom PID to automatically (or even manually) attach to ttyUSB%n, without much success. The device's normal VID/PID is 0403/6001. When ...
2
votes
1answer
841 views

Mimo 2G USB Monitor and cheap computer (Raspberry Pi?) [closed]

I have a Mimo 2G USB Monitor (UM-710S I believe) which I got in college due to the lack of space for a real second monitor in the dorm. Now I don't really have a use for it, so I thought of ...
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2answers
224 views

Mount zip file as a read-only filesystem

I am looking for a way to mount a ZIP archive as a filesystem so that I can transparently access files within the archive. I only need read access -- the ZIP will not be modified. RAM consumption is ...
2
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1answer
61 views

What could be done to make Embedded Linux boot faster?

My team is developing a software for a Embedded Linux solution. The problem we are facing is that it takes too much time for the system to be ready to start running our desired apps (that is, too much ...
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0answers
30 views

Linux Booting from NAND instead the uSD

I have some trouble with booting up my zImage. I'm using CORE9G25. So, usually I boot up using the uSD. And after uncompressing the linux and etc it's working. But, after I moved the uSD to the other ...
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1answer
658 views

Trouble with opkg package manager in Angstrom embedded linux on Colibri module ARM v7 processor

I am working on a Colibri module having Angstrom linux installed in it! The processor is ARM v7. I am having trouble updating the softwares installed in the system. Whenever I tried the command opkg ...
1
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1answer
279 views

Unable to add serialport (nodejs module) when generating filesystem and cross-compiling tools for an ARM processor

I am using buildroot (version 2013.08.1) to generate the filesystem and cross compiling tools to implement embedded linux on a i.MX233 processor (ARM architecture). I add the serialport module by ...
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0answers
29 views

Manipulation of the backlight in a embedded linux device is unstable

I want to control the backlight value of a LCD monitor in a embedded linux device. Doing researches throughout the internet I found a couple of references saying that the file called backlight inside ...
2
votes
1answer
415 views

How to debug random reboots, with no kernel panic, of an embedded system?

I have two aValue RPC-10W1 embedded systems that reboots by themselves after 1-2 hours. Facts: The board will reboot within a time span of 1 to 2½ hours. The issue is present on two identical ...
9
votes
4answers
2k views

What filesystem offers best protection for securing data against corruption due to power loss?

I am running a small uClibc and busybox based embedded system on an x86 device. I am using an initramfs but I also mounting a custom ext3 directory on a compact flash device in IDE mode that I am ...
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0answers
40 views

How can I make a read-only Linux system (which uses unionfs) read/write for the duration of upgrades?

Assuming having an embedded linux application, and for protection against corruption from example abrupt power offs, you implement a read only system with union fs. But then, how is it possible to ...
2
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0answers
398 views

How can I make wlan0 show up automatically when I plug in my WiFi USB adapter?

Before I plug in the USB there is no wlan0: root@beaglebone:/mnt/etc/network# iwconfig lo no wireless extensions. eth0 no wireless extensions. usb0 no wireless extensions. ...
8
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3answers
573 views

Open Source router firmware options?

What distro's exist that are designed for routers? Please include the following link to the project page link to supported hardware list what distinguishes them, why pick this option friendly web ...
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0answers
229 views

uBoot on BananaPi, stuck waiting for waiting for root device /dev/mmcblk0p2

I flashed banian linux 14.09 to an SD card stolen from a raspberrypi. I've plugged a 2.0amp raspberrypi power supply into the correct microusb power port (the one by the SATA connector). Boot stops ...
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0answers
36 views

Linux and Embedded systems engineering [closed]

First of all I hope everybody had a great weekend. My question is simple. Which version of linux is best suted for embedded software engineering and programming. Thank You AO!
2
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1answer
778 views

What is the fastest way to install GCC on Wind River 3.02?

I am fairly new to installing things on a bare-bones Linux system and really do not want to just blindly install rpm after rpm of dependencies I think I might need... I know that this version of ...
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0answers
31 views

running graphics based script with disabled desktop environments on system startup

I'd like to introduce first what I am trying to achieve. I am having a Linux script which requires graphical environment OR which is graphical(I am myself not sure what I am trying to make others ...
11
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2answers
2k views

Is using a read only root file system a good idea for embedded setup?

I have been tasked with running Linux as an operating system on an embedded device. The target has an x86 processor and has 8 GB CompactFlash device for storage. I have managed to use buildroot to ...
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0answers
49 views

error: getrlimit(RLIMIT_CORE): Operation not permitted. Proftpd on Embbeded Linux enviorment

I've been trying to use proftpd on Arm7 Embedded linux. After starting the execution, it delivers this message: error: getrlimit(RLIMIT_CORE): Operation not permitted The Proftpf version is ...
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0answers
42 views

How to make 'install USB' with custom Linux?

I built my own custom kernel for new hardware.(Not a normal PC, embedded x86 device), and using syslinux I could create a booting USB for that kernel. After a few trial and errors, I was able to ...
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0answers
76 views

I have made custom audio cape using TLV320AIC3107 codec and here is a schematic diagram

I have made custom audio cape using TLV320AIC3107 codec and here is a schematic diagram. For connection with BeagleBone Black I refer audio cape which is available in market. here is a link: ...