Questions tagged [embedded-linux]

For questions related to Linux on embedded systems (e.g. mobile, consumer electronics, networking) or single-board computers (e.g Raspberry Pi)

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24 views

How can I know If a USB 3 device connected to a Linux computer actually uses the SuperSpeed lanes?

I've got an embedded platform running Linux on ARM processor. There is a USB3 camera connected via a USB3 HUB (the kind of Hub that is embedded on a PCB permanently, not the one that you manually ...
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1answer
43 views

EMMC with unblanced block erase count

We developed some embedded Linux products which write data log 24h*7 to 8GB eMMC chips. When reading the block erase counts of every block inside the eMMC chips by sending the CMD56 command. We found ...
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46 views

Dropbear reporting “Bad hostkey signature” on some SFTP servers

I'm running an embedded Linux system with Dropbear installed to support SFTP operations. I had tested my system against a Globalscape SFTP server during development and things were working well. I ...
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1answer
59 views

Why are the IPtables and kernel module versions not matching in Yocto Linux?

I am trying to add IPtables to a Yocto Linux image but I think versions of compiled modules and modules needed for IPtables do not match. IPtables is looking for modules under /lib/modules/4.9.88 but ...
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1answer
165 views

Difficulty setting up internet sharing on Beaglebone on macOS Big Sur

I am having trouble setting up an internet to be shared on Beaglebone (BB) through the host (Mac running Big Sur OS). When I do ifconfig on BB, I see two USB interfaces showing up (usb0, usb1) with a ...
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1answer
22 views

Loading a file complains about file not found in a specific path, but filesystem is read-only so can't copy

I am loading a wifi module which is sitting in /usr/lib/modules/<kernel_version>/extra by running modprobe <module_name.ko> but it errors out saying modprobe: FATAL: Module <module_name....
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62 views

Setting a wifi on an embedded linux - not seeing wlan0 on ifconfig

I'm trying to set up a wifi on this linux-based embedded board which has a wifi module embedded on top of it. I have configured hostapd.conf and wpa_supplicant.conf with the specific SSID and password....
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1answer
19 views

Do any linux systems depend on at (atd) for system functionality? I want to disable it

I have a cubieboard (an SBC, like a raspberry pi) that I'm using in an embedded application. While testing a box before shipping I noted unacceptable lag in the user interface. Investigation turned ...
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21 views

Remount folder on read-only partition as temporary writeable folder (overlays)?

if I type the following command sudo mount -t overlay -o lowerdir=/etc,upperdir=/tmp/upper,workdir=/tmp/workdir none /etc Is it correct that /etc (overlay) folder will be stacked on top of /etc (read-...
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56 views

Kernel Panic: How to solve the linux kernel panic for unable to mount root fs on unknown-block(0,0)?

How to solve the linux kernel panic for unable to mount root fs on unknown-block(0,0)? Here is the debug info(sorry for no embed image cause i have no enough reputations): My plan is this: build a ...
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31 views

Embedded WiFi access point and mesh on single radio

After beating my head against the desk for about a week I am still amiss in trying to find a solution to my particular problem, so I am pretty sure I'm either doing this entirely wrong, or somewhat ...
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1answer
56 views

routing for an embedded device connected to Ubuntu laptop via USB

I have a device called a pocketbeagle that I have been trying to add to my local network without success. I've tried many things, but none have been completely successful. This didn't look so ...
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147 views

How to display LCD type in Embedded Linux such as Raspbian

I am interested in determining the hardware type of the LCD on a RetroGame that runs embedded linux. I would like to know if there is any command that can fetch a part number or anything that can help ...
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1answer
319 views

How to conditionally strip/compress binaries with alternate utilities (i. e. other than strip)

In our yocto-based embedded application, we now have several Golang binaries, which can become very large. For example, docker (from meta-virtualization) and related binaries weigh in with several 100 ...
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1answer
291 views

How to export pins with GPIOD

We're using Colibri IMx6 and we need to access few pins. Back in the sysfs days, we were able to just echo the export to a "file" on a system and the pin would get "activated". Now ...
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1answer
295 views

Command requires missing /run on read-only filsystem

I am trying to run a command (cryptsetup) on an embedded system using squashfs. It requires /run but that directory does not exist, and I cannot create it since it is read-only. I have an ASUS router ...
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628 views

screen issue. Getpwuid can't identify your account

this is the result of the strace /screen I am trying to launch screen static binary. I have created /etc/passwd and /etc/group. When I did ls -la /etc/passwd /etc/group I didn't get any errors, but ...
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1answer
323 views

Issues with libgcrypt when starting from a service

I'm currently working on a embedded linux distribution to get networking up and running. I need it to switch between ppp connection and wifi when it's available. I'm doing this with wpa_cli -a (active ...
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16 views

MTU network path

On an embedded device, there are a CPU and a LTE modem. They are connected together using serial port using GSM 07.10 multiplexing protocol. On the Muxed serial port, PPP handles the communication ...
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0answers
18 views

Possibility to delete unused data of growing website in chrome

I’m new here and was searching for an article, what say how to delete unused data. I have a website running on an embedded Linux device. It shows basically the whole time the same content, but grows ...
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2answers
180 views

Why Imx6q(Embedded Linux Device) ethernet communication is too slow?

I have tried several methods to test the ethernet communication of the Imx6 card. 1) When I ping in my computer from IMX6, the ping does not reach the IMX6. But when I ping to imx6 from the computer, ...
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1answer
399 views

gpioset: error setting the GPIO line values: Device or resource busy

I am using Linux on my SAMA5D27 embedded board. I am also using libgpiod to manipulate GPIO configurations of the board. First, I can list all the lines of specified gpiochips, their names, consumers, ...
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1answer
28 views

Bluetooth characteristics scan

I am developing a bluetooth application for an embedded linux device. On the hardware I have an IMX 6 MCU and EMMY W161 communication module. The operating system is a Yocto Project distribution (Poky)...
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1answer
2k views

How to Add Something Extra to a Busybox System?

So suppose that I have Busybox installed on an embedded device (e.g a router) and need to add something extra to it (a package). Now suppose that now I need to install a package to it besides using ...
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1answer
799 views

Which kernel moduules are really needed for docker installation?

I am trying to install docker on a dragonboard 410c and am getting an error when trying to run systemctl start docker: failed to start daemon: Error initializing network controller: error obtaining ...
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55 views

How to discover which device is the display frame buffer device of an embedded Linux hardware

I want to install the tslib in an embedded Linux hardware. But I don't know which device is the "frame buffer" needed to set TSLIB_FBDEVICE. /dev folder: /dev $ ls -la drwxr-xr-x 10 root root ...
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171 views

Modetest LCD outputs are not identical on new LCD implementation

I have been working on implementing a custom 10.1" LCD screen to my Acqua “System On Module” (running a SAMA5D36 Microchip MPU) unfortunately without any good results. The problem I am facing is that ...
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99 views

Auto-serial-console and ttyPS0 crashing on Linux boot

I have a Zedboard-like system that I run embedded Linux on. I connect to it via a serial console where I use minicom on my end. A week ago an issue started where my auto-serial-console where the ...
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2k views

Enable telnet and telnetd services on Busybox

In order to enable Telnet on Busybox, should be enabled both telnet client and telnetd server services?
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61 views

BOA hang - how to detect this and take action for this

I am having a SDK which has a boa webserver running in it to server HTTP requests. It is seen that at times the BOA server hangs. The boa server is not dead as it is shown in the device as running ...
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1answer
1k views

How to properly flash uboot onto SD card?

I've been experimenting with embedded linux using a BeagleBone Black. I've managed to create a minimal linux distribution using yocto. When I want to flash the secondary bootloader (MLO) and the ...
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204 views

Yocto Build Error

I am building images(yocto,bitbake,busybox) for two differnt karo SOM's. Both of the configuration files are the same (including my own software) One build fails during the QA portion of the build ...
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105 views

I can compile and flash the code to microcontroller using mbed-cli, but the output isn't working

I installed and configured mbed-cli for Linux, following the official documentation. I can compile and flash the code to micro controller but the output isn't working (not even serial print), but it ...
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0answers
410 views

How can I access a SPI NAND Flash Memory in embedded Linux?

I am a newbie with embedded Linux. I am using a Leon-Linux system on my evaluation board(Grmon GR712). I can compile the Linux kernel and build an image file via build-root. I want to access an SPI ...
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1answer
1k views

UBI layout volume not found

I am following Bootlin's embedded Linux training which aims to put an embedded Linux system on an Atmel SAMA5D4 Xplained board (theory slides, practical lab instructions) and I am stuck a putting the ...
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1answer
273 views

How to determine in a shell script whether DHCP is running or not

If I am running a shell script in linux environment, is there a way to determine whether DHCP is running or not? Something like below is what I wish to do in pseudocode terms: #!/bin/sh if [DHCP is ...
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2answers
664 views

minimize boot time for linux

I am working on an embedded system. The OS is yocto project(Ubuntu). My target hardware has to start the animation application after powered on. I am starting my animation application as a systemd ...
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466 views

Read only file system on linux embedded device

I am using Qt to write an app to deploy to an embedded Linux device. My dev computer is a vm running Ubuntu and it communicates with the embedded device over ethernet and rs232. Qt has a section to go ...
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0answers
167 views

Embeded Software Linux HOSTAPD Connection Issues

First off I don't know if this the right forum to ask this in. If you know a better one, please let me know and I will post it there, don't just downvote the question... I have an older embedded ...
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1answer
3k views

Missing TUN/TAP driver on embedded Linux

I came a long way to encounter this problem, so several dead end steps will be omitted. I was trying to create a TAP interface. The first step taken was to check if I have the needed tool (which I ...
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1answer
117 views

how to run system services by sending request via browser

I want to create an interface similar to that of a dsl router where you can edit network settings in the browser and restart the router with new settings. I want to edit some settings in the browser ...
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0answers
314 views

Chrome kiosk: can auto updates and Safe Browsing downloads be disabled or blocked?

I are running Chrome in kiosk mode in custom linux environment, and have IoT devices that run on cellular. I am noticing that Chrome periodically downloads approximately 3MB of data an hour, updating ...
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0answers
73 views

U boot send failed: Error when trying to load a u boot image

I am trying to load a uboot image on a PCB. The board uses a pre-configured script in which it attempts to boot the board and, seeing that there is no boot image, it downloads the image over Ethernet ...
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250 views

yocto embedded-linux system recovery

I work with Yocto Poky 1.7.3 on an imx6DL and i'm trying to implement a system recovery. I can boot system both from NAND and from SD card, but the "main" system resides on NAND. In case of corruption ...
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543 views

Can't connect to free wifi network with iwconfig in Linux embedded

at first sorry for my English, it's very bad. I hope you will understand my problem. I'm working on Yocto dizzy and I'm trying to manage Wi-Fi connections. On my board I have a wf111 module. When I ...
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36 views

Downsizing to almost embedded linux

I have a thin client machine with Puppy Linux on it and it works well. I would like to make it fast something like embedded Linux. All it needs to do is to run one Procesing sketch/app (java) in ...
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229 views

linux virtual comport drivers for AR drone.

I have been working on this problem for quite a while now and cannot seem to find the correct driver for Linux to interface with an STM32F407. The Linux runs on an AR drone 2.0. The STM already acts ...
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1answer
321 views

Cannot find USB external HDD /dev/sda

I am running as usual my orange pi one plus H6 ALL WINNER with ubuntu server and cannot find my exFat HDD on it, it detects the usb but not /dev/sda and cannot mount or access it, yes I tried with ...
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0answers
337 views

How does tcpdump configure an interface it begins to capture packets from?

On an Arago embedded linux system, an interface would normally be able to ping other destinations on the network. However, the pings stop working when using a utility such as iperf or scp to send TCP ...
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1answer
1k views

U-Bboot won't autoboot but manual boot works fine

I've built an image for a Freescale iMX6 EVK board (ARM based), using Buildroot. It booted fine off an SD card, and I wanted to experiment with customized boot commands in U-Boot. I want to make the ...