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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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8 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
22 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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0answers
21 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
8 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
47 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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0answers
33 views

Setting the default gateway permanently with Debian:

I am using a BeagleBone board running Debian. To set the default gateway I have to manually type this every time I start it /sbin/route add default gw 192.168.7.1 In order to have this default ...
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0answers
26 views

Custom software as init process (PID 1)

I'm making an embedded system and I don't want to use C or C++ for security reasons, and I need lots of RAM, so things like a PIC processor which I've used in the past aren't an option. I'm planning ...
0
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1answer
23 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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0answers
12 views

Add same files to multiple PACKAGES

I have a the case where three binaries are in the /usr/bin directory and want the test program in a separate package: /usr/bin/execbin1 /usr/bin/execbin2 /usr/bin/test In the recipe file I have ...
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1answer
33 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 ...
1
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1answer
31 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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0answers
19 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
8 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
36 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. Could someone guide me with the Hardware Requirements for ...
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2answers
29 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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0answers
18 views

NFS client side empty

Trying to set up a shared folder between an embeded linux device and my development box. Short version is that the client side folder remains empty even when I create a file on the client side. Below ...
3
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2answers
651 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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0answers
38 views

Disk disconnects after exchanging large files

I have an embedded PC with a Debian os and OpenMediaVault to share resources across the LAN. I have an external USB/SATA enclosure with a 1 TB HD. Both the USB enclosure and the HD works fine ...
0
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1answer
20 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 ...
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0answers
35 views

I2C error preventing mounting system as read-write

I'm working with an IP Camera running an embedded Linux distribution (on Qualcomm Snapdragon 625) (APQ8053). A few days ago I changed the jumper that controls the mode the camera is on (LAN or USB) ...
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0answers
34 views

Make read-only system into writable failing when remounting as rw

I'm working with an IP Camera by Thundersoft, having a Qualcomm Snapdragon 625 running a Linux distribution. The filesystem by default is read only, but during the past month I've been able to skip ...
1
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1answer
42 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
63 views

udev not loading a module

I'm trying to get udev to load the brcmfmac driver as a module but for some reason it's not detected unless I create a .conf file in a /modules-load.d directory (either in /etc or /lib). As far as I ...
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0answers
29 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
49 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
70 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 ...
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0answers
35 views

DT bindings for ADT7516 sensor

I have a BeagleBone green and ADT7516's evaluation board connected with SDA and SCL pins. When I do i2cdetect -y -r 2, I can see the i2c address as 0x4b and I am able to probe the adt7316 driver ...
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0answers
28 views

What am I missing in my kernel patch for ALSA to get EAPD to properly turn off this internal speaker? [closed]

I'm working with a picture-frame-like device manufactured by the late OpenPeak Inc. known as the OpenFrame (or O2 Joggler in the UK). It has an internal speaker and a 3.5mm line out socket; none of ...
2
votes
1answer
470 views

How to use dd if=/dev/mem in place of devmem ?

It seems like root@testbox:~# dd if=/dev/mem bs=1 count=4 skip=2149646336 | hd should be nearly equivalent to root@testbox:~# devmem 2149646336 32 But, while devmem works great, that dd invocation ...
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0answers
26 views

Armbian: dm-raid module has gone missing

I'm running Armbian (stretch) on an OrangePi PC 2. This is how the OS identifies itself on SSH login: Welcome to ARMBIAN 5.58.180813 nightly Ubuntu 16.04.5 LTS 4.18.0-rc8-sunxi64 I just updated my ...
1
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1answer
52 views

writing small web service for embedded device based on debian [closed]

We are developing embedded device which will integrate with some of our services in future. This device have limited set of functionalities and user defined mods for particular use cases. Based on arm ...
0
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1answer
35 views

Build kernel without support for /boot's file system

I am building a customized kernel for RPi. The problem is that the RPi bootloader requires a vfat /boot partition whereas I intend to minimize the kernel size, so need to remove vfat support from ...
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0answers
242 views

user configuration of rsyslog does not work

I am trying to provide the option to user to add their user configuration option for rsyslog. The default rsyslog is working fine for me. The main or default configuration for rsyslog file looks ...
1
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0answers
87 views

Error in mounting rootfs in android

Failed to make and chown /acct/uid_0: Read-only file system I have a i.xm6q sabresd reference board and another is a development board based on i.mx6. I'm trying to port Android O on development ...
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0answers
339 views

Using squashfs on top of ubi as root file system

I'm trying to use a compressed squashfs ubi volume as my root file system. The idea is to have two ubi volumes. Volume one contains a read-only squashfs file system. Volume two is re-sizable and uses ...
0
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1answer
23 views

Driver compatibility between distros

I am working on a project that will involve the communication between a data acquisition system (hardware) and a computer board called Beaglebone. One of the hardware that I am evaluating said to have ...
0
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1answer
56 views

What makes debian different from other variants given they have same kernel? [closed]

In the recent project we have been asked to create a debain based system for a SOC. Doing some gooogling I did find guides that point to ways to use yocto to create a debian system [1]. But then I ...
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0answers
94 views

embedded system no longer boots via eMMC - Initramfs unpacking failed: junk in compressed archive [closed]

I have Arch linux on multiple Embedded boards that are similar to Odroid C2. To resolve a DTB file issue, I wrote dtb.img to /dev/dtb of the eMMC via the command : dd if="/boot/dtb.img" of="/dev/dtb"...
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0answers
68 views

Our Telit LE910C1-NS based board gets nameserver information, but won't ping

We've been using the Telit DE910 to connect to establish a ppp connection through Sprint. We need to change it to the LE910 family. Last week I was able to get the Telit LE910-SV1 (Verizon version)...
2
votes
1answer
179 views

is there a way to atomically move file and directory from tempfs to ext4 partition on eMMC

We have beaglebone black based custom board with 256MB RAM and 4GB eMMC. Board runs Linux kernel 4.9 we are running into a situation where we create a file in tempfs and then after validation, we ...
1
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1answer
81 views

Installing a cross-compiled linux kernel on Pine64(or Raspberry Pi or any other similar Single Board Computer)

I am preparing a new linux kernel for Pine64, because it is slow, I did the cross-compilation on a linux PC. I am looking for a way to run make install && make install modules without copying ...
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0answers
26 views

Changing Master Boot Record (MBR) starting partition address of boot loader

From what I understand, the partitioning of the Linux system - when booting from an SD card on an embedded device should look something similar to: I want to move partition 2 up and merge it with the ...
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0answers
56 views

Tvheadend on a set-top-box

Context I have a set-top-box Octagon SF4008, with openATV installed on it . I would like to stream the channels over the computer network, in particular to run Tvheadend directly on the set-top-box. ...
0
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1answer
50 views

Get same /etc in different Operation Systems

I have an embedded system with 3 operating systems (self-created Debian 9.4 with 4.14.40-rt Kernel). Each operating system is on a different partition. A bootchooser sets up the system so that when ...
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0answers
543 views

How to take read all the partitions from eMMC dump

We have Beaglebone Black based custom board with 4GB eMMC and 256MB RAM. eMMC is partitioned as follows # parted --list Model: MMC MMC04G (sd/mmc) Disk /dev/mmcblk0: 3842MB Sector size (logical/...
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2answers
77 views

Can I run Linux on specific CPU cores?

I'm making a brainwave detection device. Will be using an Octa-Core ARM processor for the software processing. For the management of CPU cores, can I code Linux to strictly run on a specific set of ...
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0answers
31 views

Very slow HTTP requests over time on embedded Linux

An application I'm developing is gradually getting slower and slower to run HTTP/HTTPS requests over time. It's running on Buildroot embdded Linux on some quite old and slow hardware. After a few ...
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0answers
79 views

Linux kernel update

I'm trying to update the kernel version from 3.14 to 4.0.9 of Debian distribution. For boot I'm using U-Boot, and my microcontroller is imx6 (ARM architecture). I have the sources for the 4.0.9 ...
4
votes
1answer
885 views

When can Linux boot with a Read-Only Root Filesystem

I am working on a embedded Linux with u-boot as bootloader and systemd init system. The tools are limited to standard busybox. While analyzing some problems, I figured out the root filesystem is read ...
2
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0answers
153 views

Cannot set wifi card to use non-HT IBSS modes using iw

I have two embedded systems that will be communicating with each other using Doodle Labs NM-915-1F wifi transceivers. One system is an Axiomtek PICO831 running Arch Linux 4.10.9-1-ARCH, and the other ...