Tagged Questions

1
vote
1answer
33 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 ...
1
vote
2answers
105 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) ...
0
votes
0answers
25 views

CPU scaling not working properly

I have been working on Angstrom2010.07 build all these years. I could change the value of 'scaling_governor' in this built. On changing from 'Userspace' to 'Performance' mode, the BogoMIPS value gets ...
2
votes
3answers
149 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
votes
1answer
122 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 ...
3
votes
0answers
82 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
1answer
157 views

Checking linux Kernel for RT-Preempt Patch

How to know whether a particular patch is applied to the kernel? Especially RT-Preempt Patch.
2
votes
1answer
158 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, ...
1
vote
1answer
366 views

How do I safely unmount a network share on Linux STB without crashing (I get GSOD)?

I have a network share named dreambox on C:\dreambox that is shared with the group Everyone in Windows. I have mounted it to /hdd on a Linux-based STB with OpenDreambox (OpenEmbedded) using Telnet ...
1
vote
0answers
103 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 ...
5
votes
1answer
370 views

Defragging RAM / OOM failure

This question is fairly lengthy, so I'll ask the questions at the top and then go through my method of coming to the questions: Did (Busybox based) rm not execute because there wasn't enough ...
-1
votes
1answer
204 views

Installing a .ko module on an embedded Linux system that does not support modules

From the answers to this question I have discovered that the embedded Linux distribution provided to me, by my hardware supplier, was not built with kernel support. If I am to use this distribution I ...
3
votes
1answer
254 views

Embedded board with apache

I'm working on a Davinci DSP ARM embedded board. The board itself is the Texas Instruments 816X/389X EVM. I'm currently trying to get apache working on the board. The problem is that the SDK for the ...
2
votes
2answers
234 views

Is it safe to just copy shared libraries onto embedded Linux device?

The following is contained in the vendor user manual for its embedded Linux distro on the hardward board they supply Developers can put their program onto X-Linux device via FTP or NFS. Before ...
3
votes
0answers
291 views

Set GPIO permissions cleanly

Can the default permissions and ownership of /sys/class/gpio/ files be set, e.g. by configuring udev? The point would be to have a real gid for processes that can access GPIO pins on a board. Most ...
1
vote
2answers
153 views

System Management Mode in embedded systems

I wish to install Xenomai which works on Linux providing a kind of hard real time environment. x86/64 architectures are supposed to contain the "System Management Mode" which prevents them from being ...
1
vote
1answer
1k views

Webserver for Embedded Linux [closed]

I am building an ARM based embedded device running embedded linux having a web based interface and I need a webserver running on my device. At maximum it will get 50 requests at a time. I have on ...
3
votes
1answer
343 views

How to test the touch screen on embedded devices like iPhone / iPad / Kindle? [closed]

I want to test the touch panels on embedded devices like iPhone, iPad and Kindle against following criteria: Do a gesture, like tap, swipe, pinch ( zoom in/out) 10000 times and validate that every ...
0
votes
1answer
51 views

Do IPTABLE rules apply to other devices on a network?

I have an embedded device that listens to a specific port to be programmed by vendor specific software. If I have a network that consists of a small linux computer and this industrial device would ...
3
votes
2answers
200 views

Linux security vulnerabilities?

A while back I started an embedded project using the 3.2.10 kernel. Now the project should go into production and the stable kernel is 3.2.16. I would prefer not to upgrade anything to avoid ...
0
votes
1answer
268 views

init.exe: Caught segmentation fault, core dumped - what is the source of this error

On my embedded device, I have this error showing up after kernel boot: init.exe: Caught segmentation fault, core dumped But I cannot understand why is this happening? If I do battery cut( i.e. ...
1
vote
2answers
311 views

NAND flash memory wear & virtual memory page swap

For a linux kernel with virtual memory and disk storage, pages are swapped back and forth into swap area. But embedded systems generally use NAND flash instead of disk. A NAND flash has a limited ...
1
vote
1answer
180 views

Recommendation on filesystem for embedded device - RAM or USB

It's been 4 years since I stopped working on my Linux internet radio box. My Linux box was Ubuntu 6.04 with Ext3 fs. At user-space, everything works perfectly except I occasionally bumped into ...
3
votes
1answer
375 views

How can the job of SDFlasher.exe given with FriendlyARM utility be accomplished on Linux?

I am playing with FriendlyARM Tiny 6410. The instructions on setting up an SD card for booting self compiled versions of linux kernel involve the use of SDFlasher.exe. People have tried to find an ...
0
votes
2answers
194 views

Sony runs which operating system? Oracle Linux or Crestron Extron or Minix or OS X?

Sony has TV, PlayStation, Camera random hardware's. Where many of those have GUI available too. I want to run my BASH script there with ncurses. But how do they drive there devices? Which operating ...
6
votes
1answer
1k views

How can I observe memory bandwidth?

I have an embedded Linux ARM system that is showing significantly less throughput than expected on both Ethernet and USB. I suspect the memory may be contributing. Is there a way to observe the memory ...
2
votes
1answer
714 views

how to re-enable input on a serial console

I have an old router which runs Linux and I'd like to have a serial console on. This used to work fine, but after a firmware update, I can now only get output on the console and cannot give any input ...
10
votes
2answers
1k views

How do I have Linux boot with a rootfs in RAM?

The rootfs is a squashfs image and my bootloader is loading it into some address in SDRAM. What parameters do I need to pass to the kernel so It can mount the rootfs from there? Squashfs support is ...
0
votes
1answer
546 views

Problems with a Read-Only Root Filesystem

I was creating a read-only root filesystem for use in an embedded system. I successfully got the system to boot after setting it to read-only initially, but then I needed write access to another file ...
6
votes
2answers
1k views

Safely use SD cards when power can go out at any time

We're working on a small embedded Linux system (2.6.35-ish) with a smallish internal NAND device for the OS and applications (250-500Meg) and an SD card with 8Gb SDHC SD cards for data. The unit's ...
1
vote
1answer
253 views

How to install Linux on the Lego Mindstorms NXT

Has anybody ever successfully installed Linux on the Lego Mindstorms NXT Intelligent Brick? I've found plenty of things on Google, but none of them worked. I can't find the download for legOS, and the ...
1
vote
0answers
352 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 { ...
2
votes
1answer
270 views

What is the fastest way to install GCC on Wind River 3.02?

I am fairly new to installing things on a bare-bones Linux system and really do not want to just blindly install rpm after rpm of dependencies I think I might need... I know that this version of ...
9
votes
4answers
7k 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.) ...
11
votes
3answers
1k views

Increasing kernel memory size

I have an embedded board with 512MB of RAM running Linux 2.6.29 and UBoot bootloader. But the kernel is able to utilize only 128MB of RAM. I tried changing the value of XCODE_MEMSIZE, which I think ...
1
vote
1answer
629 views

How do I cause a watchdog reset of my embedded Linux device

Is there a command like vi > out vi | out That I could use to cause a watchdog reset of my embedded linux device?
4
votes
3answers
3k views

Kernel panic - not syncing: No init found. While booting from U-Boot

Kernel mounted the root file system but can not find any init script. I'm sure that script exists in my ramdisk.img! I also checked out this and GE863-PRO3 U-BOOT Software User Guide 1VV0300777 Rev. ...
2
votes
2answers
208 views

How to start customizing linux?

I've heard that Android is based on linux (or unix?). That means, engineers at google modified linux code to run on android phones or tablets. I would like to become those engineers someday. Where ...
0
votes
1answer
92 views

Kernel - Starting the application

I placed the uBoot loader and the kernel into the raw flash image. This does not contain any root file system. (I copied uBoot and kernel image using dd command to a flash image). Now i have to ...
1
vote
3answers
2k views

Reading EDID from EEPROM

From the link: http://en.wikipedia.org/wiki/Extended_display_identification_data The EDID is often stored in the monitor in a memory device called a serial PROM (programmable read-only memory) or ...
5
votes
3answers
385 views

Open Source router firmware options?

What distro's exist that are designed for routers? Please include the following link to the project page link to supported hardware list what distinguishes them, why pick this option friendly web ...
9
votes
3answers
2k views

Shell command to read device registers?

On a single-board computer running Linux, is there a way to read the contents of the device configuration registers that control hardware? I think it would be a wrapper for inw(), more or less. I'm ...
3
votes
3answers
488 views

Debugging ethernet before NFS boot

I'm trying to boot Linux from U-boot on an embedded ARM board using a filesystem on a remote machine served via NFS. It appears that the ethernet connection is not coming up correctly, which results ...
3
votes
2answers
244 views

Databases for embedded Linux?

I need to choose a database for an application on an embedded linux platform. Any suggestions on which databases are typically used with embedded linux? Please let me know. Regards Radha.
2
votes
2answers
2k views

using cross-compiled Valgrind

I have downloaded the sources from the Valgrind trunk and built it for using on an embedded Linux system(Montavista Linux) powered by an ARM926(ARMv5t architecture). Everything went well until I tried ...
5
votes
2answers
445 views

Resources for very low-level (board bring-up)

I've worked with a few embedded systems, but now I'd like to make my own piece of hardware and despite a pretty thorough knowledge of Linux, I have no idea how to get Linux up and running on new ...
6
votes
1answer
341 views

Linux kernel 2.6 on ARM

I have compiled and installed the 2.6 kernel on an ARM board. I am using the ARM mini2440 board. I would like to know if there is already a way to access the General Purpose I/O port pins? Or will ...
7
votes
6answers
496 views

Linux Programmable Controller

I'm looking for a programmable Linux controller for home automation and general fun projects. Requirements: Controlling electric appliances - On/Off switches and dimmers (perhaps using relays) ...