Questions tagged [embedded]
An embedded system is a computer system designed for specific control functions within a larger system.
68
questions
45
votes
4
answers
63k
views
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 ...
- 698
23
votes
6
answers
7k
views
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 ...
- 381
12
votes
2
answers
24k
views
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 ...
- 999
12
votes
4
answers
3k
views
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 ...
- 1,922
11
votes
2
answers
3k
views
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 ...
- 277
10
votes
2
answers
4k
views
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 ...
- 203
8
votes
1
answer
45k
views
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 ...
- 519
7
votes
11
answers
34k
views
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 ...
- 307
6
votes
2
answers
7k
views
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 ...
- 111
6
votes
1
answer
7k
views
`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 <target> always worked. When I did that with dropbear on my router, it failed like this:
# ssh -NfR ...
- 163
6
votes
3
answers
16k
views
Up-to-date distros supporting 32-bit i586/non-PAE, specifically for ALIX boards (AMD Geode) [closed]
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 ...
- 197
6
votes
2
answers
2k
views
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 ...
- 61
5
votes
9
answers
3k
views
Recommended embedded linux device for light server and learning [closed]
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 ...
- 173
5
votes
1
answer
5k
views
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 ...
- 171
4
votes
5
answers
3k
views
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 ...
- 224
4
votes
3
answers
15k
views
I accidentally disabled the web interface for DD-WRT
I accidentally disabled the web interface for my DD-WRT router, but I can still SSH in. How can I fix it so I can admin with the GUI again?
- 323
4
votes
2
answers
1k
views
remote network access to LAN devices - VPN/LAN
I have several energy meters (with a web server embedded) distributed in many buildings, all these sensors are connected to the local network so that can be accesed through a browser to see the real ...
- 59
3
votes
2
answers
6k
views
Emulate EWF effects on Linux
Recently, for an embedded project, I was asked to emulate on Linux the effects of the Enhanced Write Filter (EWF) of Windows XP Embedded.
In particular, I need a sort of EWF for:
avoiding to write ...
3
votes
1
answer
224
views
Windows Embedded Standard Run-Time Image Build Length
I've been using XP Embedded for a while and I recently started working with Embedded Standard since that's the latest binaries for Windows Embedded and includes SP3. Everything works just as expected ...
- 163
3
votes
0
answers
741
views
ESXi host loses connectivity to embedded USB storage
Referencing ewwhite's SF question/answer here: What happens when the USB key or SD card I've installed VMware ESXi on fails?
I have a real simple question. We deal with this constantly and a ...
- 32.8k
2
votes
1
answer
174
views
44pin industrial flash ide on embeded debian freezes after an indefinite period of time [closed]
On an embedded system I have, using a 44 pin transcend industrial flash, after a while I will notice that I cannot read any files or write to the disk. I am using the 3.2.0.* BPO i686 SMP PAE kernel. ...
- 999
2
votes
2
answers
5k
views
Installing embedded pfsense, stuck at boot loader
I am trying to install pfSense embedded image 1.2.3 RC1 onto a CF card. The box looks like it is ready to boot, but gets stuck at "Loading /boot/defaults/loader.conf" followed by "/". Can anyone ...
- 97
2
votes
6
answers
2k
views
Browser-based Operating System
I have a bunch of touchscreen machines that I want to display a webpage on and have users interact with the webpage via the touchscreen. Right now, this is done with a full-blown OS with a browser set ...
- 184
2
votes
2
answers
2k
views
What is the best linux file system and fs configuration for embedded systems
After experiencing some crash related file system outages (requiring manual fsck and repair, we are looking for the optimum file system and fs config for an embedded linux with HDD or SDD mass storage....
Ber
2
votes
1
answer
569
views
Embedded device for deploying network probes
Our environment has a multitude of remote subnets that we monitor by deploying Linux-based probes running various network monitoring software and other handy tools. Currently we're using surplus-ed ...
user62491
2
votes
1
answer
1k
views
SEPM embedded database stuck on "Starting"
I have recently upgraded SEPM (Symantec endpoint protection manager) from 12.1.4 to 12.1.5.
Upgrade completed successfully however the 'Symantec Embedded database' service stuck on 'Starting' status.
...
- 61
2
votes
2
answers
114
views
Disk encryption without cooperation from system
I have a small embedded system that supports fat32. It does not have any encryption options for the files that it saves to a external usb connected disk. Modifying the source to support encryption is ...
- 317
2
votes
1
answer
20k
views
How to manually setup network connection from Busybox shell (ash)?
An embedded device running Linux version 2.6.26.5, ARM Linux Kernel. Busybox v1.10.2 shell (ash), I'm in Busybox shell. I want to set up connection between embedded device and computer. Is it ...
- 121
2
votes
0
answers
201
views
Xorg in an embedded system--leaking memory?
I'm working on an embedded system that runs a custom Linux platform and it appears that the Xorg process is leaking memory. According to top, Xorg's virtual memory grows until the system crashes. ...
2
votes
1
answer
597
views
Qdisc pfifo_fast in linux and IP Precedence
Im using a embedded Linux distribution for a router system. My goal is to prioritize some traffic with minimum delay. I have a WAN interface with a default pfifo_fast qdisc attached to it. I have read ...
- 203
2
votes
0
answers
560
views
Mounting main partition read-only and temporary folders as tmpfs
I have a small embedded board PC which uses flash card to boot and I'm running Ubuntu server 12.04. But since flash cards have limited lifetime I would like to mount it as read only and have only some ...
- 21
1
vote
3
answers
995
views
Compact Flash mounted Read Only
I have a board, running linux (RedHat, kernel: 2.4.32). The board has been up and running since long time. However suddenly, some errors are being observed in the logs, and the Compact Flash (present ...
1
vote
2
answers
1k
views
Strange UDP/TFTP Problem
My TFTP client only seems to be getting responses from the TFTP server to its RRQ (download requests) if I watch the traffic in wireshark.
If I shut down wireshark (running on the TFTP server), the ...
- 151
1
vote
2
answers
4k
views
Problem IP Forwarding is Dropping Rx Packets on Embedded Linux Network
I have a pc and two embedded linux based systems that I am trying to chain together through IP forwarding.
They span two separate local networks. Both networks are wired. I can ping 10.10.10.6 from ...
- 111
1
vote
1
answer
161
views
Windows 7 Embedded VM in Azure
I have a really weird request.
My employer has a product that only runs on Windows 7 embedded machines and now they want to have some test VMs in Azure.
Now when I try to RDP into the machine it doesn'...
- 11
1
vote
1
answer
1k
views
SSH cannot login with root pasword
I have a buildroot system that I cannot login into with via root.
Root login using .ssh/authorized_keys working, but isn't practical since it's a read-only filesystem. Telnet root login also works.
...
- 801
1
vote
1
answer
141
views
PCI configuration
I would need an help to solve a problem.
I work on a system based on CompactPCI platform. The system is composed by:
3U CompactPCI CPU Blades (based on Pentium M processor)
3U CompactPCI proprietary ...
Kevin
1
vote
2
answers
4k
views
Wiping out user and/or root password in embedded linux
We have a security camera system running an embedded linux. It boots with Lilo as a bootloader and has no tty access once booted. I don't know any username either.
SSH/22 is open, but I don't think ...
- 1,162
1
vote
2
answers
201
views
Architecture Choice for an Embedded Display Device
So recently a client asked me to build her a virtual calendar. She's tired of having paper ones and would rather hang a few monitors on the wall instead and have them update themselves wirelessly.
...
- 848
1
vote
0
answers
39
views
Embedded Board Replies to Pings in Wireshark but not in Windows
I have an embedded board (running a Cortex-M7), and LWIP for the networking library. MAC is integrated to the CPU, but has an external PHY.
I go ahead and initialize LWIP, and when I ping the board ...
- 11
1
vote
1
answer
64
views
Discovering embedded management tools
I have a list of 130 IP addresses that I need to find out if they are ilo or another remote management tool. Is there a way to script this. Can I use the test-netconnection command in powershell.
- 870
1
vote
2
answers
593
views
Using a configuration management tool to configure nodes without ssh
I'd like to manage the configuration of several devices running embedded Linux.
There is a web server in my environment which has a SOAP interface I can use to get/set all the parameters of each of ...
- 11
1
vote
1
answer
1k
views
embedded linux serial terminal
I have built a custom embedded system using debian 6.0.
using /etc/inittab i have made several (8) processes running on different /dev/ttyX terminals, which i can switch between using Alt+FX key ...
- 11
1
vote
3
answers
701
views
Does anyone know where I could find a 2 input USB voltage meter?
What we really need is a tiny UPS, of sorts. We'll be hooking up a solar cell and a battery to a single board computer. Currently, that SBC is a custom Pic32 device, and it does it's own UPS and ...
- 283
0
votes
4
answers
208
views
Embedded devices hardware comparison [closed]
Not sure if this is a 100% serverfault compliant question, but here goes:
I need to choose the hardware for an embedded device I plan to develop and I'm looking for tips.
Ideally there'd be a ...
- 924
0
votes
2
answers
142
views
Design for wire between server and access point and RF to endpoint device
We're about to design an inhouse industry network consisting basically of the following: 1 server connected via wire to up to 100 proprietary RF access points (basically embedded devices), which each ...
- 105
0
votes
1
answer
101
views
Trace access to root filesystem: Process and filename
I run linux on eMMC.
I want to reduce the IO which gets done on the device.
I don't like to search the needle in the haystack.
I want a way to trace the access to the device.
I want to see the ...
- 3,843
0
votes
3
answers
68
views
What could this error mean?
I am having trouble with embedded linux system which keeps outputting this error:
libdirac_encoder.so.0: cannot open shared object file: No such file or directory'
Any idea what this error means? ...
- 1,169
0
votes
1
answer
1k
views
Setting up access to FTP server and SSH server using hostapd access point on embedded system
I've recently designed the circuit board for an embedded ARM system, and the next step is to work on the software to run on this hardware. I've generated the root file system using Buildroot. I am ...
- 101
0
votes
2
answers
2k
views
Embedded VoIP (Asterisk) install in home router?
Is it possible to flash an average home wireless router with a new OS that includes an embedded PBX server to route VoIP calls (such as Asterisk)?
Does the average $50 router in the living room have ...
- 585