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

5
votes
1answer
353 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 ...
4
votes
1answer
229 views

How do I load initrd into memory to be passed to kernel when using kexec?

As the MIPS port of kexec doesn't support the --initrd param, I'm looking for workarounds to imitate the feature. According to Linux/MIPS wiki, MIPS kernels support rd_start and rd_size kernel command ...
2
votes
1answer
48 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>; ...
2
votes
1answer
151 views

CONFIG_GPIO_SYSFS makes /sys/class/leds disappear

I have an embedded Linux board I'm working on, with a button and a couple LEDs. By default, I can control the LEDs via /sys/class/leds/redled/brightness However, I have no way to monitor the ...
2
votes
1answer
78 views

Flashing rootfs on Embedded Linux with Limited RAM

I'm fairly new to the embedded world, so forgive me if this seems obvious. I'm working on a board based off of the AT91SAM9260. I have 256MB of flash and 64MB of RAM. The current setup flashes two ...
3
votes
0answers
43 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 ...
3
votes
0answers
104 views

What is the difference between the output of TOP command and Oprofile?

In the top command one of the processes is always showing a CPU usage of 4 to 5%. But in oprofile the CPU usage is 0.004%. I do not understand this. And I also noticed that even when a process is in ...
3
votes
0answers
29 views

Queuing disciplines are per-interface, what happen with interfaces using same device?

I have read about queuing disciplines here http://lartc.org/. I understand that for instance band 0 of pfifo policy is prioritized over band 2 within same qdisc, but what happen when i have ppp0 and ...
3
votes
0answers
278 views

Confusion with how to restore corrupt ext3 files if power outage occurs during a file write

I am running a small embedded system. Because the system will never be gracefully shutdown and will just have the power cable unplugged, I am running an initramfs but mounting an ext3 partition on a ...
3
votes
0answers
156 views

Implement Java/JavaFX on ARM

I am working on ARM Linux. I have found this link that says that JavaFX could work on ARM. I am confused about Embedded Java SE and JavaFx ARM. Do I need to setup a JVM for those or not? I have ...
2
votes
0answers
22 views

redirecting output of /dev/fb0 to /dev/fb2

I am using IMX6 Saberauto board on Linux OS. I have 2 displays primary is HDMI and secondary is LVDS. I want to run 2 applications. One QT on primary display, which I am able to do. Second ...
2
votes
0answers
48 views

Can't login using serial on ttyO0 - BeagleBone Black

I boot Beaglebone Black, connected to my desktop by serial. It was working great, until now. Beagle is booting, output shows up on the console, but at the end I can't log in. I can't type the login, ...
2
votes
0answers
337 views

Error cross compiling linux kernel using buildroot

I am trying to build a kernel bt in cross compiling the kernel when I ran following command make CROSS_COMPILE=i686-linux- ARCH=x86 I got the following error: UCLIB_EXTRA_CFLAGS="" \ ...
1
vote
0answers
27 views

How do I know from a BeagleBone Black if it is connected via USB (as a client/slave)?

BeagleBone Black has an USB port which allows the user to access it through ssh. In general, we could say that when you plug it to a PC, the PC is the USB host and the BBB is the USB client. On the ...
1
vote
0answers
40 views

cross compile embedded arm

I have the android 4.2.2 code in directory /home/sghPhone2 which compiles normal with make menuconfig but I need to compile a 4.4 kernel and possibly patch it but when I download the source from ...
1
vote
0answers
33 views

Is there a limit of GPIOs that can be used in Linux?

When it comes to use GPIOs, is there a limited number that can be used in Linux (except through the limitation of the physical availability/amount of the ports/pins) or is it theoretically possible to ...
1
vote
0answers
52 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 ...
1
vote
0answers
35 views

What are the two head.S files in linux source ?

In the linux source there are two different head.S files located at: arch/arm/kernel/head.S arch/arm/boot/compressed/head.S What is the puprpose of each one and what is the order of there execution ...
1
vote
0answers
34 views

Get log from kernel while loading

There is a arm/omap2-based device without ethernet, UART ports. It has usb connection with host, numeric keyaboard, LCD display. There is working U-Boot and kernel images for this. I'm trying to ...
1
vote
0answers
39 views

Removed USB storage device is still mounted

I'm working on a embedded linux system based on busybox. Sometimes a USB device which is physically removed from the post is still displayed in mount, df or /proc/mounts. If I reattach the device, it ...
1
vote
0answers
79 views

Replacing default initramfs with my own

I followed this article to develop my own sample intramfs.cpio Now I have to put this in my kernel and compile. The procedure that I follw for petlinux is that I first run petalinux-config (and ...
1
vote
0answers
50 views

tty not resizing properly

I'm running an embedded poky linux (linux-yocto v3.13) on a beagleboard. However, I'm having trouble when logging in over a serial using PuTTY: the terminal does not resize at all. Usually, the ...
1
vote
0answers
69 views

Interfacing ds1337 RTC on LPC17xx

I am a newbie and I am trying to understand how to interface DS1337(RTC) on LPC17xx Board. This board uses uclinux 2.6.33. .CONFIG: CONFIG_RTC_LIB=y CONFIG_RTC_CLASS=y CONFIG_RTC_HCTOSYS=y ...
1
vote
0answers
109 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 ...
1
vote
0answers
74 views

Why is my embedded Linux unable to detect the sd device?

I have this ARM9 SAM9G25 embedded System, running a Linux 2.6.39 Kernel and a Busybox. I put the Images (of the bootloaders, and the linux+initramfs) on a SD so that in the end the system is booting ...
1
vote
0answers
130 views

Log files corrupted with NUL characters and text from other processes

I am running Wind River Linux 4.3 on an embedded Freescale single board computer (SBC). Output from uname -a: Linux ge101 2.6.34.10-myname-grsec-WR4.3.0.0_cgl #1 SMP PREEMPT Mon Aug 26 01:35:35 PDT ...
1
vote
0answers
244 views

Linux embedded: change time zone

I'm working on an embedded system with linux. I'm trying to change the timezone used by the operating system and I'm doing this by copying the timezone file from /usr/share/zoneinfo to /etc/localtime ...
1
vote
0answers
97 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 ...
1
vote
0answers
68 views

No network interface for the lan9118 emulated on QEMU 1.4.0 overo machine

Im using QEMU 1.4.0 Ubuntu 13.04 distribution. Im trying to make the virtrual machine part of the host network so Im ussing this command: sudo qemu-system-arm -M overo -m 1024 -sd ./test.img -clock ...
1
vote
0answers
96 views

omap3530/3630 emulation on QEMU for overo and beagle machines

On QEMU's source code for beagle and overo I can see that the cpu emulated is the OMAP3430. I will like to know if it's a way to make QEMU emulate OMAP3530/3630 cpu's for those machines? On bealge : ...
1
vote
0answers
99 views

About Ingo Molnar's Realtime Preemption patch

Does Ingo Molnar's Realtime Preemption patch support ARM cortex-A8?
1
vote
0answers
125 views

How do I get Linux on my sat nav?

I have a Clarion MAP680 navigation system, with some version of Windows CE on it. Is there any way I could hack it to get my beloved Linux on it? It seems to have a 1 GB flash drive or something, and ...
1
vote
0answers
559 views

Why is this ALSA configuration file preventing aplay and arecord from listing PCM devices?

In my embedded system I have this configuration file in /etc/asound.conf: pcm_slave.sl2 { pcm "hw:0,0" rate 48000 channels 2 format S16_LE } pcm.rate_convert { ...
0
votes
0answers
9 views

WAN interface using his own queues for QoS different that the provided by Linux

My Linux embedded system have a WAN interface with the default pfifo_fast qdisc attached to it. The web interface for configuring the system let the user configure three Queues for the WAN interface ...
0
votes
0answers
33 views

Interfacing with a custom camera in Linux on the beaglebone

I'm new to Linux development and need some pointers to help me get a camera (OV7670) working on a beaglebone running Debian. Using the camera capes as a guide, I've connected the camera to the GPMC ...
0
votes
0answers
28 views

Use Rsync with HTTP

Is it possible to use rsync with an HTML POST request? If so what would the rsync command look like? For example let's say using HTML5 I have this (bear with me going back to linux stuff): <form ...
0
votes
0answers
52 views

How can I make a configuration web page for a linux appliances? Any pre made solutions available?

I am putting together a bunch of embeded linux appliances that we will be installing at a few locations. Built the whole thing from scratch using Raspbian (debian based) and Raspberry Pis. There are ...
0
votes
0answers
78 views

using sf probe to make u-boot faster

My uboot was running slow on a ARM cortex A9 processor based Xilinx zynq chip. Xilinx forum referred me to the following to solve this issue: +From 0a212cfc2dd4e4d1595de2ca2dde3f642e5707e7 Mon ...
0
votes
0answers
192 views

No filesystem could mount root, tried: jffs2

CPU: ARM Cortex A-9 This is the kernel command line that I appears in configuration menu root=mtd:jffs2 rw rootfstype=jffs2 console=ttyps0,115200 I have put three files in flash: BOOT.BIN in mtd0 ...
0
votes
0answers
31 views

What could keep a process in 'Runnable' state indefinitely?

I am developing for embedded Linux and I have found a critical bug when stability test is performed. After 1-3 days running at some points the system becomes inoperative. Kernel network stack keep ...
0
votes
0answers
96 views

optimizing Debian wheezy for an embedded board

I have Debian 7.1 on an embedded board that I just use WiFi interface, openVPN, and run a C code. The code uses UDP socket to transfer data, and do some calculations and output some signal on GPIO. ...
0
votes
0answers
107 views

prioritize traffic for some bridge interfaces using prio qdisc

Im configuring my router to give preference to some WAN interfaces. This interfaces are named ppp0 (PPP interface), vc2 (RFC1483 bridge interface) and vc3 (RFC1483 bridge interface). I had understood ...
0
votes
0answers
84 views

how to enable java support to buildroot

I'm using buildroot 2012.08 version for building embedded linux. I'm looking for best solution to add java support. Is it possible to do trough buildroot?
0
votes
0answers
61 views

Creating JFFS2 image

I am working on Embedded Linux, trying to create JFFS2 file system in the host and trying to load it on a NAND device in the target board - Olinuxino a13 wifi using Livesuite. I successfully created a ...
0
votes
0answers
117 views

Compiling a simple character device driver as a module

I wrote a simple character device driver & wanted to cross-compile it for craneboard (ARM architecture). My file name is gDev.c. I copied the file to kernel/drivers/char directory in craneboard ...
0
votes
0answers
94 views

Changing Android files in root directory

Does anyone know how (if it is possible) to change Android files stored in root directory, particularly logo.rle? I want to change my boot splashscreen, changing the file, which is stored in /. I have ...
0
votes
0answers
83 views

Colour is not working with ncurses on target embedded system built with buildroot

I have built an embedded linux environment for AMD Geode target. The kernel, cross toolchain and root file system were built using buildroot and the root file system resides on my host machine and is ...
0
votes
0answers
191 views

A Reboot() command with failover

I'm implementing a Reboot() call in my application. It's an embedded application, so no console, keyboard or power switch. The Reboot() must eventually restart the system no matter what. Ideally, I ...
0
votes
0answers
477 views

Running uinput code on DM368 board

I am using DM368 TI board. I want to send keystrokes to gstplayer in ubuntu 10.10 For that purpose i used uinput function in C code. My code works properly on console but not on the hardware. I even ...
0
votes
0answers
231 views

Facing issue with cron on embedded linux

I have a SAM9 based board running embedded linux using buildroot package. I added the crond and crontab support to busybox from make menuconfig and built the rootfs and flashed it to my board. The ...