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Questions tagged [embedded]

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

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Cant hide mouse cursor on embedded Debian

I am working on a Debian-based Dragon Board (410C) system. The system will produce a touch screen that triggers some functions of a car. I am trying to hide the mouse cursor in my application. ...
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1answer
21 views

How to manually mount the virtual file systems, to copy MTD partitions

Linux version 2.6.26.5, ARM Linux Kernel on embedded device, NAND-based device. I'm at Busybox rescue shell (ash), with restricted command set. How to manually mount the virtual file systems, to copy ...
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1answer
14 views

Run script after module is loaded due to device tree

Why do I want this? I use the pwm-ir-tx kernel module to blast IR signals from my embedded device. However, when the pwm kernel module is loaded during the boot process, the pin is on high. It takes ...
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40 views

Backup MTD partitions on NAND flash use 'nanddump'

Linux version 2.6.26.5 om embedded board, at boot time created 11 MTD partitions on "gen_nand": # cat /proc/mtd dev: size erasesize name mtd0: 00060000 00004000 "u-boot" mtd1: 00020000 00004000 "...
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28 views

How can I run a script on a Unix box without enough space to store it?

Specifically what I'd like to do is run screenfetch on my router, just for fun. Here's my disk space free: admin@RT-N66W:/tmp/home/root# df Filesystem 1K-blocks Used Available Use% ...
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1answer
22 views

Replacing busybox in an embedded device

I'm using busybox in an embedded device. The built-in busybox is rather limited. So I want try to replace busybox in place with new, more complete version. I find some info about replacing Busybox on ...
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31 views

How to configure embedded linux kernel so that the file system is visible on the host linux

I am using a powerpc, and after building and flashing the linux kernel on the device I can see the file system. But if I try to create a user or make any changes they get erased and resets to default ...
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26 views

How to use embedded device as bluetooth HSP/HFP source

I have ARM based board, kernel 4.14.67 and bluez-4.101. I want to connect bluetooth headset for playing sound from the board. My question is similar to that: https://stackoverflow.com/questions/...
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22 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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45 views

Reading and writing NAND flash with dd

I have an embedded device and I'd like to backup the NAND flash. From the openwrt wiki I gathered that dd is not a suitable option for dumping. You can use dd, but the dump will be garbled. However, ...
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1answer
27 views

How investigate sporadic restarts

The system is : Debian 8.1 run on embedded system with ARM7V CPU 2 GB RAM and 4 GB flash. The system sporadically restart itself couple time in day, before a week with appear very rare. What is the ...
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1answer
38 views

How to read back a fan speed?

I am on a custom board using an i.MX6. I am using Yocto (Pyro) to build my kernel (4.14.16). I am using the generic imx6qdl.dtsi device tree entry for PWM2 to drive the fan and it appears to work ...
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3answers
21 views

Are there any current videostream-player-type 32-bit distros in 2019?

I have these thin clients that are not in use I think they’d do perfect for a security camera video wall—just feed them an RTSP/RTMP URL and be done, GUI not needed. I’ve been lazily looking for ...
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2answers
102 views

Embedded Linux: setting the time without NTP

Working on a embedded Linux device built using yocto that is pulling a date via uart from another device with a satellite connection. By the time we have access to this date, we are well into a fully ...
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1answer
58 views

Asterisks locks ALSA device if chan_alsa is loaded

I am implementing an extension 900 which routes the audio to ALSA device.  I am also using mpd, which plays music through ALSA. Asterisk 15, OpenWrt 18.06 mpd.conf: log_file "syslog" ...
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1answer
106 views

Get video device on embedded Linux SoC

I'm trying to find the camera module device of an IP camera (running Linux), without much success. My main objective is to find the camera stream, so I can attach an RTSP server. Update 26/02/2019 ...
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1answer
57 views

Optimal sharing of a ring buffer between processes

We're implementing an embedded Linux system and have to provide a live updating graph on a website that shows data coming from a background process in the system. The question is how to optimally ...
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0answers
37 views

How to tell Linux where initramfs is in RAM

I'm trying to boot a Linux kernel running on top of Xen with a initramfs copied into RAM by the bootloader. In the device tree I took out a chunk of memory so the kernel will not overwrite the area ...
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32 views

Cannot Reach External Network Despite DHCP on QEMU Embedded Guest

I am trying to give an embedded router networking on QEMU. I replaced the router's kernel and modules using a generic buildroot build for the Malta CPU. I also can compile any software needed to help ...
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12 views

How deep is U-Boot's `bootm` command checking for a valid header?

TL;DR: How many ways can the bootm command fail with this error in version 1.1.4?: # bootm Booting image at 31000000 Bad Magic Number Background: I've bricked a device whose U-Boot is deeply ...
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44 views

How do I rearrange the clock tree to get the clock I need?

I am using a LVDS display on an i.MX6 DualLite. The panel is supposed to be running at a clock of 51.2MHz. I am in the process of updating to a newer Yocto (Pyro) built BSP running 4.14.16. The ...
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47 views

Import value from kernel startup code to user space

I need access to a variable, an integer, whose value is determined during startup on this embedded system. The kernel is: 2.6.35.14 and the variable I am trying to access is created an used in the ...
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22 views

Is it possible to access linux/ramdisk code memory from its running system?

I'm working with an embedded Linux device that has to be auditioned by a regulatory agency. The agency will select a few devices in the field to check if the code running is the same as auditioned. ...
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1answer
79 views

resolv.conf always empty

I have 2 different embedded devices...an old one running TI arago Linux and a Xilinx device (petalinux). On both I see the same outcome when adding dns-nameservers to /etc/network/interfaces and ...
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1answer
51 views

Interpreting /proc/partitions

I'm confused about the partitions size of a flash memory in my embedded linux device: / # cat /proc/partitions major minor #blocks name 240 0 93184 ndda 240 1 85168 ndda1 ...
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1answer
31 views

JTAG'ing firmware into imx28

My goal here is to load a custom kernel and initramfs into the memory of the wink hub 1 based on imx28 dev board and boot it using the bootm command from u-boot shell. So, I downloaded the u-boot ...
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1answer
136 views

Flashing U-boot on beaglebone black

I got a beaglebone black which comes with u-boot linux preinstalled on the emmc. For the sake of learning I want to put u-boot on the flash myself and build linux from scratch. I have compiled u-boot, ...
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0answers
20 views

Embedded Linux: Setting up NFS (or any service) in a portable way

If I have a read-only file system, but with a read-write overlay on /etc, is it possible to run NFS service (or any other service) via a USB drive, as if the service is a portable application? Note: ...
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2answers
111 views

Rootfs versus kernel confusion [closed]

I know that they are two different entities. Rootfs is a file system which describes how to store and access data. The kernel is actual code which executes. However, isn't the kernel code stored ...
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114 views

How to bitbake copy a prebuilt static library into the sdk

Scenario: I am working with yocto linux recipes. I am trying to make a recipe which simply copies a prebuilt MyLibrary.a and its headers available on the built linux image. So, I have a libMyLibrary.a ...
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1answer
184 views

mmc0 warning on SD card bootup of linux

I get the following warning on debian linux (kernel 4.18.8) bootup of my microchip sama5d3 board: mmc0: unrecognised SCR structure version 4 mmc0: error -22 whilst initialising SD card after spewing ...
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1answer
54 views

SD card issue in embedded linux

My setup: Embedded linux version 3.x on an ARM board with a SD card. After running for a couple of months, I am getting this print in the console. I want to understand this issue, and fix it. ...
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27 views

How do I shrink a partition from the beginning? i.e. create empty space at the beginning of the block device?

I have devices with SD cards, with several partitions. The first partitions on the card is typically not mounted, and have vfat filesystem. What I want to achieve is, to create a 1MB free space just ...
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0answers
96 views

login system on a buildroot linux router [closed]

I have a Gemtek WVRTM 127ACN router / modem, If you do not touch any key during startup, linux starts automatically. It's a linux version created with buildroot, the problem is that there is not a ...
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25 views

How to check the history of processes

I'm using Debian running on a BeagleBone Black. I have a script which is supposed to execute when the system starts. The script then should run a python script. I add the command to run this script ...
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0answers
16 views

integrity check of uboot using dd

I just upgraded uboot using dd and it boot successfully : dd if=uboot_file of=/dev/mmcblk0 bs=512 The output is : 1360+1 records in 1360+1 records out I would like to read backup to ensure every ...
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1answer
93 views

How much space does my Debian OS need

I am using a BeagleBone, with 4GB of internal emmc. When I install a Debian image on it from its site and run command df -h , the result is below. /dev/mmcblk1p1 shows that it uses 3.4G of memory. ...
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1answer
29 views

nc server does not work if launched on startup

I wrote a (ba)sh script to write to a file the content received from a POST method: #!/bin/sh PORT=$1 FILE=$2 while true do echo -e "HTTP/1.1 200 OK\n\n" | ./busybox-armv7l nc -l -p $PORT | tr '[\...
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1answer
245 views

Could not find libmount

During compilation of customized distribution (using buildroot v. 11.2018) I have problem with libmount library (the problem appeared after I had included efl package in buildroot menuconfig - Target ...
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1answer
124 views

Install python on an embedded device

I'm working on an embedded device already customized. Here some details: # uname -a Linux DX-4400 3.10.31-ltsi-05172-g28bac3e-dirty #12 SMP Tue Jan 23 17:14:13 EST 2018 armv7l GNU/Linux I have root ...
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40 views

What baud rate should I set when using screen tty for bluetooth?

I'm paired up with an Xbox Controller and want to see the output coming from the xbox controller in order to figure out its protocol. I'm trying to do screen tty.Bluetooth-Incoming-Port 9600 on my ...
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0answers
9 views

DBus Transport - force transport to idle state from Bluez5 embedded side - A2DP [closed]

I'd like to be able to force Bluez's transport state from active to idle on the rendering side of a custom embedded platform. This issue is centred around the fact that simply pausing the A2DP ...
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1answer
57 views

What are the Hardware requirement for Debian Linux Kernel 3.16 for PPC architecture? [closed]

We have an Embedded System which is running on Debian Linux Kernel 2.6-2.6 [PowerPC Architecture]. Would like to upgrade the Kernel to 3.16. What are Hardware Requirements?
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2answers
84 views

How to make /var/log persistent through reboots on an embedded linux device

Scenario I am on an embedded linux system. As usual /var/log/ is the directory when all the logs are stored. I have a directory called /safepath which is created during image creation and it is on ...
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2answers
713 views

Reduce Boot time

I would be interested in finding ways to reduce the boot time, specially in embedded-related environments. I've read somewhere of a method to avoid the kernel to load some drivers or modules but I'm ...
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1answer
31 views

Need to switch debian FS readonly writable layer from tmpfs to aufs to not lose files after booting

I'm trying to have this done on a debian 9 based embedded system. The fs that come for root is mounted as such in /etc/fstab: # /etc/fstab: static file system information. # /dev/mmcblk1p1 / ext4 ...
1
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1answer
61 views

IP Camera with embedded Linux won't connect to internet using ethernet

I have an IP Camera from Thundersoft with a Qualcomm Snapdragon 625 chip inside that runs a Linux distribution. It is extremely limited in terms of available commands, and I can't install any new ...
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0answers
35 views

Why “receive / transmit bytes” is so big difference between optical modem and host when download data on host?

ens33 is my host network card,it show a normal number as my network use status,but I don't know why my modem show a very small data traffic in all interfaces of modem when download on host. My host: ...
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0answers
150 views

udev: how to wait for a specific device to appear from a shell script

I have an embedded system with a tiny initramfs which needs to mount an overlayfs over the rootfs partition and switch_root to the new merged filesystem. It's just a couple operations run from the ...
4
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1answer
132 views

gunzip on Embedded machine

I'm using BusyBox 1.24.1 on my Embedded Linux machine (with kernel v3.10.31) and I get behavior I can't understand when unzipping files.  The gunzip command (often, but not always) fails, with no ...