Questions tagged [embedded]
The use of Unix in embedded computer systems such as networking equipment, mobile phones, media players, set-top boxes, etc.
1
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0answers
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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. ...
0
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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 ...
0
votes
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
votes
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 '[\...
0
votes
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 ...
0
votes
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
vote
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 ...
0
votes
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 ...
1
vote
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 ...
-1
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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 ...
0
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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
votes
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 ...
0
votes
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) ...
0
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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
vote
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 ...
0
votes
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 ...
0
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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:
...
1
vote
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
votes
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 ...
1
vote
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 ...
3
votes
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 ...
1
vote
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
vote
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
votes
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 ...
1
vote
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
vote
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 ...
1
vote
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
votes
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
votes
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 ...
1
vote
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"...
0
votes
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
vote
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 ...
1
vote
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 ...
0
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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
votes
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 ...
0
votes
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/...
2
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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 ...
