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

2
votes
0answers
19 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
3answers
10k 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 ...
2
votes
1answer
43 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
15 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
15 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" ...
1
vote
1answer
43 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
0answers
15 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
62 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
30 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 ...
1
vote
1answer
842 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
votes
2answers
827 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 ...
0
votes
1answer
30 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 ...
0
votes
1answer
2k 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 ...
1
vote
1answer
34 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 ...
5
votes
3answers
146 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
70 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 ...
1
vote
0answers
163 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
31 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
20 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 ...
14
votes
4answers
28k 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.) ...
2
votes
1answer
226 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 ...
0
votes
0answers
38 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, ...
3
votes
1answer
258 views

Why doesn't 'ar' work like the manpage says?

I'm trying to use 'ar' included in Debian Wheezy armel version of binutils and it doesn't seem to operate like on other systems I've encountered. Some sample output from the command-line: $ ar ...
0
votes
0answers
39 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 ...
0
votes
0answers
81 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 ...
2
votes
0answers
75 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
76 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
25 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 ...
1
vote
0answers
42 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
23 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 ...
1
vote
1answer
186 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
85 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 ...
1
vote
1answer
2k views

How can I disable IPv6 in custom built embedded setup

I have an embedded system built using buildroot. I have had a number of network issues, one of which is that my machine cannot see its gateway despite it being on the same subnet. I have tried using ...
11
votes
2answers
3k 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 ...
0
votes
1answer
195 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
146 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 ...
1
vote
0answers
213 views

Arch Linux iMX6 capacitive touch LCD panel

I want to create an embedded system with a 7 inch capacitive touch screen and am planning on using Arch Linux on a Varscite made Freescale iMX6 quad based SOM development kit for this purpose. What I ...
0
votes
1answer
96 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 ...
1
vote
1answer
902 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 ...
1
vote
1answer
138 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 ...
17
votes
5answers
3k 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
votes
1answer
212 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
53 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 ...
5
votes
4answers
4k 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: ###.###.###.### ...
0
votes
0answers
184 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
1k 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
85 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 ...
1
vote
1answer
1k 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
votes
1answer
207 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>; ...