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

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887 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 ...
7
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2answers
4k 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 ...
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0answers
11 views

Applying device tree overlay

I have a device based on imx233-Olinuxino-Nano. The Arch Linux Arm distro boots and works. However, there is a slave device on my board that is connected to SPI of CPU. It is supported by kernel, ...
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1answer
14 views

Sending command to an already mounted modem

I'm working on a IMX6 based board, and I need some advice to handle my modem. I've successfully configure the modem, and mounted the ppp. The modem is working fine and everything's great, but now I ...
3
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2answers
922 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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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 ...
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3answers
13k 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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0answers
29 views

Cross compile gdb for mips and make executable file small like one in OpenWrt

I would like to cross compile gdb for mips, but the normal version is too big for my small embedded device. I was wondering how those guys on OpenWrt make it ~3mb. I downloaded gdb ipk, extracted ...
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11 views

Sending data intermittently over Wi-Fi and/or 3G

I am working on an embedded Linux system that reads in data through a serial connection, stores the information in a local buffer, and sends the data to the local Windows server when there is a ...
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2answers
546 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 ...
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1answer
34 views

Two or more threads on single core [closed]

What are the advantages of using threads on single core, does that makes sense to use multithreading on single core?
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2answers
96 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 ...
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1answer
92 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 / ...
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0answers
97 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 ...
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4answers
84 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 ...
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0answers
42 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 ...
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1answer
45 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 ...
4
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1answer
226 views

Why is my swap not being activated automatically via fstab?

I've got a Linux embedded system that I'm experimenting with (the Elektor Embedded Linux Made Easy board, based on the GNUBLIN http://en.gnublin.org/index.php/GNUBLIN-Elektor). I'm using the 3.3 ...
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0answers
7 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 ...
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0answers
62 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
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1answer
65 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 ...
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0answers
32 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.
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0answers
43 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" ...
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1answer
95 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 ...
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0answers
25 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 ...
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3answers
70 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 ...
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1answer
89 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 ...
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1answer
39 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
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1answer
48 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
207 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 ...
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0answers
112 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 ...
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0answers
47 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 ...
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0answers
25 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
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4answers
30k 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
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1answer
291 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 ...
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0answers
89 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
302 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 ...
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0answers
72 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 ...
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0answers
97 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
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0answers
112 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 ...
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0answers
125 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
42 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
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0answers
56 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 ...
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0answers
32 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 ...
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1answer
240 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
102 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 ...
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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
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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
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1answer
281 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
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0answers
185 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 ...