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

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How do I send text to a USB device?

I'm trying to get the "Torobot" USB servo controller to work with Angstrom on a Beagle Board XM. The servo controller registers as a USB device. The device just takes simple text commands, but there ...
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2answers
160 views

Which embedded Linux platform supports Suspend to RAM?

I am trying to save maximum energy for a certain embedded Linux application. Currently I am using Raspberry Pi. But it looks like Raspberry Pi doesn't support Suspend to RAM. What alternative embedded ...
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1answer
582 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 ...
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1answer
175 views

can linux be configured to blink an LED (GPIO) on disk activity?

I'm hoping to blink an LED that is wired up to a GPIO line whenever the USB connected disk has activity is there an easy way to pull this off?
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1answer
137 views

Is it possible to have two seperate one way (simplex) serial ports to make single tty device?

I am building embeded device, which has IR comunication with PC and it will have two IR Led/detector pairs which are one-way and are setup like this: IR source input commands -> near embeded device ...
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1answer
180 views

Using ncurses for basic GUI on a process started inside an init script

I have a custom written application that runs on a embedded setup (buildroot). My application has to run every time the target device boots up and so I wrote an init script to do this and it works ...
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1answer
314 views

What is the meaning of the errors from my cpio command?

I have been using the following command on my system to create the .cpio archive to create an initramfs for my embedded target device sudo find . | cpio -H newc -oc > ~/initramfs.cpio This has ...
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0answers
240 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 ...
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94 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 ...
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1answer
798 views

Copy/Mirror traffic to WAN interfaces without “iptables tee” support

I want to copy every outgoing packet to other WAN interfaces but my iptables (v1.2.7) doesn't have TEE target support. I wonder if there is another way (maybe using iproute2 or ebtables) to copy every ...
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0answers
64 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 ...
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1answer
87 views

How can I find the Secure Attention Key (SAK) on my system and can I disable it?

In answer to My process was killed but I cannot understand the kernel notice, I was pointed to some documentation on the Secure Attention Key (SAK) on Linux. I have a embedded system generated using ...
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0answers
95 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 : ...
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0answers
99 views

About Ingo Molnar's Realtime Preemption patch

Does Ingo Molnar's Realtime Preemption patch support ARM cortex-A8?
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98 views

Are there any good Embedded Linux image builder? [closed]

I'm looking for an image builder to create several Embedded Linux images for different ARM boards. I know the following image builder: linaro, buildroot, openEmbedded, yocto If I've missed one, ...
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2answers
466 views

ttyO ports do not have the good port address on QEMU 1.4.0 running image for beagleboard-xm

I'm running an Linux Image (kernel 3.2.8) for beagleboard-xm on QEMU's 1.4.0 emulator Ubuntu distribution for 13.04. My image is created using Buildroot beagle_defconfig. I added some pkgs to be able ...
2
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1answer
145 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 ...
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31 views

Spurious “command not found” [duplicate]

I am in the process of trying to build and install pjsua on my embedded board running linux with a kernel which is a variant of 2.6.18.. The board is booted via nfs from my filesystem. I have built ...
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1answer
85 views

Why does exec file generate 4 processes in Linux? [closed]

I build my RTAI-model-source(generated by simulink) in CygWin with gcc-linux-4.1 (cross-compiler of CygWin) on Windows, and generate ELF successfully. and the ELF runs correctly on Ubuntu. After the ...
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2answers
1k views

Why is my wlan0 interface on Angstrom (Beagleboard) “Not Associated”?

I'm installing a Angstrom (custom build, not the default build) on a Beagleboard XM. I can scan for wireless networks using iwlist and see the neighborhood wireless devices. I have set my SSID and ...
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1answer
172 views

compressed and uncompressed kernel on an embedded device

I have been using several different embedded boards that store kernel, init files, filesystem, etc. on partitions of a (micro)SD card. I notice in the example usage or instructions that compressed ...
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1answer
97 views

UART0 Access in AM1808 using Embedded Linux

I am trying to interface GSM module with my AM1808 processor. I am using gcc compiler as well as UBUNTU 10.04 Lucid. I have configured the TXD and RXD pins of UART0 but i can not access the RTS and ...
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3answers
120 views

What considerations need to be made when choosing the version of kernel for an embedded device?

I have used buildroot to successfully create a kernel, root file system and cross-compilers to enable me to write application code to run on an embedded device. Currently I have no need to write ...
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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 ...
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1answer
143 views

How do I install packages permanently on my Beagleboard?

I have spent some time getting my BeagleBoard XM computer up and running with the default Angstrom demo image after it has sat unopened for close to a year. I've been able to interact with it through ...
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1answer
75 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 ...
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1answer
226 views

Making a recovery partition in embedded Linux

I have an Atmel SAM9X system running Angstrom. I am trying to make a recovery partition so when a user holds a button during boot up the recovery partition boots up. I have modified the bootstrap so ...
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1answer
105 views

How to create a debian 3.x kernel rootfs on a 2.x host

I'm trying to build a rootfs for an embedded A10 board. This will be matched up against 3.0.62+ modules and a corresponding vmlinux image. I've been trying for a few days to get a rootfs set up for ...
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3answers
1k 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
276 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 ...
7
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1answer
520 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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1answer
854 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 ...
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1answer
227 views

Unable to get embedded device to ping anything on the network

I have an embedded device, built using buildroot, kernel version 3.6.11 running busybox. The kernel is built with completely default options. I have configured the device according to what the network ...
2
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2answers
367 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 ...
2
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2answers
412 views

Is it a bad idea to not have a swap partition on an embedded linux setup?

I have a small embedded linux kernel and file system created via buildroot that is installed onto a compact flash drive running on an x86 board. I am using an initramfs (due to power loss concerns) ...
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2answers
164 views

How to flash U-Boot to a Devkit8500?

When I try running this: make CROSS_COMPILE=/root/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi- omap3devkit8000_config I get this error: make: *** No rule to make target ...
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3answers
485 views

Is making /etc directory read only a bad idea?

I have an embedded system setup built using buildroot and using initramfs. It runs on compact flash device where I have created separate ext3 partitions to mount /etc/ and /var directories as well as ...
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1answer
303 views

What happens with /etc/fstab when using an initramfs?

I have a simple embedded setup as follows: x86 target, kernel and root file system built using buildroot. Syslinux is the bootloader configured to boot with an initramfs which points to a .cpio file ...
2
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1answer
499 views

Does uClibc support using pthreads?

I recently attended an embedded Linux course that stated that uClibc does not support the use of pthreads and that it only supports linuxthreads. Furthermore, the course instructor implied that ...
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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 ...
3
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1answer
264 views

Using ramfs on embedded system

I am required to write some software to run on Linux installed on an x86 based embedded setup that has a 8GB compact flash drive for data storage. The critical requirements are logging measurement ...
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1answer
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 ...
2
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1answer
228 views

Alix Board write performance

I have an alix board on which I have installed debian4alix (sqeeze). After using it for a while I noticed that the write performance of the board was pretty low. I ran the following test: dd ...
2
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3answers
269 views

Is there a variation of Linux or Unix that does not require open licensing?

In the future I may be building a system with an embedded operating system. Given the commercial properties of this system, it will make sense to have all of the internals as closed source as ...
2
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1answer
331 views

Chain loading kernel without a boot loader

I am working on an embedded project that will do in-place upgrades. There may come a time when an upgrade will need to reinstall everything. Since this is a pretty risky thing, I would like to have ...
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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 ...
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1answer
562 views

Checking linux Kernel for RT-Preempt Patch

How to know whether a particular patch is applied to the kernel? Especially RT-Preempt Patch.
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1answer
748 views

Alternative to ethtool on MontaVista embedded Linux

I am running MontaVista Linux Professional Edition 3.1 on an embedded system. My version of this distribution doesn't seem to have ethtool available, and using mii-tool gives the following error: ...
2
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1answer
265 views

What is the connection between jiffies and IPS? How to convert jiffies to IPS?

Reading from /proc/PID/stat a lot of information can be processed. I would like to see how many percentages has been used of CPU power by this process. There are a lot of variable around here (utime, ...
3
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1answer
144 views

How can I find the cause of clock drift on a custom embedded system?

We have custom hardware running 3.2 Angstrom on a SAM9G45 processor. Everything works fine. Recently we designed similar hardware that uses the SAM9G25 processor. We found the 2.6 kernel works fine on ...