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Questions tagged [embedded]

An embedded system is a computer system designed for specific control functions within a larger system.

Embedded systems contain processing cores that are typically either microcontrollers or digital signal processors (DSP). The key characteristic, however, is being dedicated to handle a particular task. Since the embedded system is dedicated to specific tasks, design engineers can optimize it to reduce the size and cost of the product and increase the reliability and performance.

Source: wikipedia

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OpenVPN performance: how many concurrent clients are possible?

I am evaluating a system for a client where many OpenVPN clients connect to a OpenVPN server. "Many" means 50000 - 1000000. Why do I do that? The clients are distributed embedded systems, each sitting behind the system owners dsl router. The server…
Steffen Müller
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How bad is it to have multiple devices with the same SSH server keys?

I am working on an embedded device that runs FreeBSD and SSH. As you know, sshd likes to randomly generate a set of server keys when it first boots up. The problem is that we will be shipping the product with a read-only sd-card filesystem…
NXT
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How to lock out normal (non-admin) users during software installs?

We have a lot of thin clients running Windows Embedded Standard 7 and an SCCM 2012 R2 server to manage them. The thin clients have their write filters enabled (FBWF) so machine changes are not persistent. On the rare occasion we have to update…
Wes Sayeed
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Making SD card corruption-proof

My embedded linux device uses an SD card for saving certain diagnostics data, far too copious for internal flash. The problem is if the device is switched off unexpectedly, the filesystem (FAT32) on the card is corrupted. There is no way to prevent…
SF.
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Prevent data corruption on ext4/Linux drive on power loss

I have some embedded boards running American Megatrends bios with embedded linux as the OS. The problem I have is that the industrial flash ide's will be corrupted on power loss. I have them formatted as ext4. Whenever this happens, I can usually…
Jonathan Henson
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Cannot get Motorola MC3190 to associate with WiFi access point

Using the Wireless Fusion management tools for the Symbol / Motorola MC3190, we cannot get the handheld to associate to the WiFi access point. Using the Find WLANs feature in the Fusion software, we can see that the device is detecting the access…
dmarietta
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Https for embedded devices, local addresses

I am trying to add https to the embedded devices I am working on. These devices are generally assigned local ip addresses and so cannot get their own ssl certificates. So essentially my question is how does one get a certificate for a device without…
Shiftee
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Up-to-date distros supporting 32-bit i586/non-PAE, specifically for ALIX boards (AMD Geode)

I have several ALIX systems (powered by the AMD Geode LX processor without PAE support) that are still running on Ubuntu 12.04, the last Ubuntu-Release to supports non-PAE kernels (i.e. compiled for the i586 architecture). I use them as low-profile,…
code_onkel
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Embedded Linux – mechanism for deploying firmware updates?

I am considering developing on the Yocto project for an embedded Linux project (an industrial application) and I have a few questions for those with experience with embedded Linux in general -- Yocto experience a bonus. Just need to get an idea of…
uptime000001
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`ssh -NfR` equivalent with dropbear

I want to open a reverse tunnel in background. When using OpenSSH ssh -NfR 9022:127.0.0.1:22 always worked. When I did that with dropbear on my router, it failed like this: # ssh -NfR 9022:127.0.0.1:22 ssh: Exited: Error resolving…
keks
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Recommended embedded linux device for light server and learning

Imagine the following situation: I want to have a tiny, light server that is able to run some services like basic Web, ftp, printing servers and pluging hard drives via usb. I would like to use it as a tool for learning about embedded devices and…
Álvaro
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Our embedded linux system won't recognize a USB Device if it is plugged in before powerup. Suggestions?

We are developing on a small embedded device. This device us a gumstix overo board running OpenEmbedded linux. We have our development almost completely done, and have run into the strangest of bugs that we can't figure out. We have a USB Device…
Blaine
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What is a good default IP address?

My company makes Ethernet devices. These devices have very little I/O. No keyboard, no video output. When the customer gets the device he must configure it for his network. I'd like to choose an IP address that won't conflict with an existing…
Robert Deml
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Client not getting address from some DHCP server

I'm working on some embedded devices which should be connected to a large network (hundreds of devices) via ethernet and that should be configured using the DHCP protocol. What I'm experiencing is that apparently the devices get the address in some…
Luca Carlon
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Is there an official way to detect an existing DHCP server?

I'm planning a new feature on our product to support a LAN. Since the installation will be done by relatively non-technical people (it's for boats) I was thinking it would be useful to automatically detect whether we needed to provide a DHCP server…
parsley72
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