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

learn more… | top users | synonyms

0
votes
1answer
29 views

Two or more threads on single core [on hold]

What are the advantages of using threads on single core, does that makes sense to use multithreading on single core?
2
votes
2answers
63 views

Installing Debian on Embedded system with serial console or network console (PCH)

I have an embedded system based on the Intel-Atom with PCH which we are busy developing. In the embedded environment I have: A Serial console through the PCH which means this doesn't work with the ...
2
votes
1answer
78 views

What are the Linux shells that allow network traffic management (sending/receiving data to/from `/dev/tcp/host/port`) via redirectors?

Following this Bash tutorial, I have succeded in obtaining the code of a web page issuing simple commands by using this method: $ exec 3<>/dev/tcp/www.google.com/80 $ echo -e "GET / ...
0
votes
0answers
17 views

Linux WiFi CRDA SysFs Entries for Regulatory Domain

I'm using CRDA to set the WiFi regulatory domain on Linux with TI's wl18xx module to country code US. When I boot up I see the following messages confirming that I am loading the "cfg80211" module ...
4
votes
4answers
71 views

How do I create small disk image with large partitions

I am building a disk image for an embedded system (to be placed on an 4GB SD card). I want the system to have two partitions. A 'Root'(200Mb), and a 'Data' partition(800Mb). I create an empty 1GB ...
1
vote
0answers
30 views

USB 56k modem not detected

I have this USB 56k modem which I'm using to write some home automation software that will let me know when my home phone is ringing. My software works on my Ubuntu 14.04 LTS laptop, with my modem ...
1
vote
1answer
36 views

Meaning of ?= and ?== in bitbake/yocto

What actually such assignment means in Bash scripts BB_NUMBER_THREADS ?= "${@oe.utils.cpu_count()}" PARALLEL_MAKE ?= "-j ${@oe.utils.cpu_count()}" MACHINE ??= "qemux86" What of above is ...
0
votes
0answers
6 views

Which technologies can be used to build up communication between MIPS linux and Windows?

We have an embedded Linux system running on a MIPS processor board. This system is used to control and to poll some other hardware, and to consolidate all the measurement data in one place. Now, we ...
2
votes
0answers
39 views

How to make iwconfig fully work on embedded Linux

The target embedded Linux is ARM Xilinx Zynq, and I am working in CentOS to compile to ARM using Xilinx's tool. The target OS is working now and I want to setup the wifi using iwconfig. I downloaded ...
2
votes
1answer
55 views

Relative path to anything not working (while running from initramfs)

I'm working in an embedded Linux system trying to get it booting its root file system in ram using initramfs. The system comes up for the most part but then has trouble in the init scripts. I've ...
2
votes
0answers
23 views

How to check flash memory for ECC errors from the Linux command line

Is there a way to check flash memory for ECC errors from the Linux command line? Note that I do not want to correct ECC errors. I just want to detect errors and list page addresses where they occur.
0
votes
0answers
24 views

How does rootfs.ext3 image file work?

I have a FriendlyARM mini6410 device and I have just hardly make it boot from sdcard. Now my sdcard uses "u-boot for mini" (u-boot.bin), "linux2.6.38 kernel" (zImage) and "rootfs qtopia fs" ...
0
votes
0answers
19 views

How to statically assign network interfaces to USB Wireless LAN adapters

For this system there are two WLAN USB adapters: One connects as a client always, and the other connects as an AP. I have a script that manages their operation, but in order to do that I need to ...
2
votes
3answers
64 views

Legal status of an embedded Linux case

I wanted to find the source code of embedded Linux that is used in Shenzhen Apexis Electronic Co.,Ltd products. For example in this page: http://apexis.com.cn/productsdetails_244.html You see they ...
1
vote
1answer
63 views

4G modem on an embedded 2.6.32.9 kernel on a Parrot AR Drone 2.0

I am attempting to compile support for a Huawei E3276 usb LTE modem for an embedded Linux/BusyBox installation on a Parrot AR Drone 2.0, which is based on kernel 2.6.32; however, I am running into ...
0
votes
1answer
34 views

Enable user login, there by login can happen either as root or user based on requirement

I am working with a board and when it finishes the boot, it gives us login as root user. What I want to do is to login as user or root based my requirement. Mean when the board boots up i should get a ...
1
vote
1answer
51 views

Clocks entry in SPI device tree entry

I'm using a DTS file for a Duovero Parlor board. To this board I've added some SPI devices. My first (a display) works perfectly so I have that entry correct at least. I want to add an entry to ...
5
votes
3answers
172 views

sshd not starting after boot on embedded linux built with buildroot?

I've done a minimal install using buildroot's default config for the Raspberry Pi. I also selected openssh and openssl from menuconfig: Package Selection for the target ---> [*] Networking ...
2
votes
0answers
85 views

How to run Ubilinux / u-boot under qemu (x86)

I wish to test Ubilinux (http://www.emutexlabs.com/ubilinux) before flashing it onto my Intel Edison board, which currently has Yocto on it. I am able to emulate Yocto for Edison with qemu, running ...
2
votes
2answers
302 views

How to create boot SD card for Banana Pi manually

It seems that I have a lack of understanding how booting SD-Card images on devices like the Banana Pi work. The situation is as follows. I have a Banana Pi and a Banana Pro. Every device has an ...
1
vote
0answers
37 views

setting up pycurl for embedded ARM

I am working on a linux x86_64 machine, and I am trying to set up pycurl for an embedded ARM processor running petalinux. I need pycurl library before building the embedded linux image. I have ...
1
vote
0answers
22 views

ARM Debian: how to transfer system from MicroSD to internal flash?

I'm a Windows user, and a true newbie in the linux world, so I hope my question is'nt too dumb. I have Debian running on a BeagleBoneBlack, booting from the MicroSD. After a lot of apt-gets, installs ...
1
vote
1answer
41 views

udevadm does not show expected information

I'm building my own Embedded Linux distro using bitbake . I added udev in the list of dependencies (RDEPENDS). I noticed that the output of: udevadm info --query=property --path=/sys/block/sda is ...
0
votes
0answers
49 views

Device tree compiler won't update

I have a problem on Ubuntu 12.04. I am trying to flash a Toradex Colibri T20 with Linux, following these instructions: http://falstaff.agner.ch/2014/03/16/colibri-t20-upstream-linux-kernel/. However, ...
0
votes
0answers
45 views

WIFI over SDIO over USB - Do I have to reflect that in the device tree?

I am currently extending an embedded hardware platform which runs a linux kernel 3.16. I want to connect an external SDIO controller to the USB bus, and then run a WIFI module using that SDIO ...
2
votes
0answers
90 views

How to switch wifi channel without dropping connection?

We are developing small internet connected device that connects via wifi and does some work. It is controlled via mobile app. For configuration purposes we use wi-fi module that can work in both STA ...
1
vote
0answers
97 views

Transfer file to pc from embedded linux device via serial communications

I'm working on an AT91SAM9G20. I'm connected to AT91SAM9G20 via the debug port using rs232 serial communications. It has Linux version 3.4.8 but does not appear to have any of the common file ...
2
votes
1answer
37 views

SSH demon not installed in linux embedded device

I have an embedded device which runs linux(arm). I am trying to update the executable through ethernet using scp command. But I got to know that sshd is not running in the device . I need to install ...
2
votes
0answers
49 views

Specify Virtual Size using DRM with Frambuffer Emulation

I am attempting make use of double buffering on an AM335x processor. We have an example running on a demo image that was not created by us. I am working on putting together our own image using ...
1
vote
0answers
30 views

How can a package's license be determined using OPKG package manager?

OPKG is used as the package manager in an embedded Linux system. I would like to be able to determine the license of a package prior to installing the package. Is there a simple way to achieve this ...
0
votes
0answers
83 views

Tegra Mesa GLES without X

I am trying to setup a Tegra 3 (Toradex Apalis T30) based system that will have an OpenGL ES based user interface on a touch screen. Unfortunately the standard Linux4Tegra kernel is seriously outdated ...
0
votes
0answers
93 views

Yocto menuconfig not working

For some reason the menuconfig menu does not come up when I try launching it from my Yocto installation. I am using the Toradex Yocto 1.6 system as is described here ...
0
votes
1answer
217 views

/dev/input/event0 is missing in embedded linux

I'm working on a project and we are trying to make a touch-screen work using Qt with Tslib. We already made some previous prototypes and we managed to make them fully functional. But when creating a ...
0
votes
0answers
166 views

Cross compile GLIBC : error: Need linker with .init_array/.fini_array support

Whenever I call glibc configure with --prefix=/usr --with-headers=/var/tmp/ubuild.wandboard-armhf.build_dir/armv7a-hardfloat-linux-gnueabi/sysroot/usr/include --host=armv7a-hardfloat-linux-gnueabi ...
0
votes
1answer
109 views

make: xscale_be-gcc: Command not found

I'm new to embedded and am reading 'Embedded Linux Primer' at the moment. I tried to build an xscale arm kernel: make ARCH=arm CROSS_COMPILE=xscale_be- ixp4xx_defconfig # # configuration written to ...
3
votes
1answer
268 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 ...
1
vote
0answers
22 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 ...
2
votes
1answer
59 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 ...
0
votes
0answers
207 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. ...
0
votes
1answer
2k 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
103 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 ...
0
votes
0answers
88 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 ...
-1
votes
1answer
174 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 ...
1
vote
1answer
81 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 ...
-1
votes
1answer
46 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 ...
2
votes
1answer
257 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 ...
1
vote
1answer
206 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 ...
0
votes
0answers
39 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 ...
3
votes
1answer
56 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 ...
1
vote
1answer
1k 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 ...