The kernel manages drivers, file systems, inter-process communication, and interrupts.
0
votes
0answers
27 views
LFS on ARM with Blink
I am interested in creating a LFS on ARM with a HTML5 rendering layer, like how Mozilla's Firefox OS has. However, I want to use the new Blink rendering engine powering Chrome and Opera (soon) instead ...
1
vote
0answers
142 views
Raspberry PI freezing
I am working on a project to getting data from serial device and transmit it to web. I am using kernel 3.2.27 with busybox few start up scripts like sysfs and proc, wvdial daemon to dial USB modem for ...
3
votes
1answer
68 views
Unable to handel kernel null pointer dereferance
Okay, so this is one of various problems I'm having trying to get by RPI/ModelB working. Here are the steps I've followed and the errors I've run into.
Installed Arch on 4GB SD card following this ...
1
vote
0answers
125 views
No image file after make (3.6 kernel compiling)
Overview: I wanted to compile 3.6.11+ linux kernel for my raspberry, after the make command, there were no image files in arch/arm/boot.
What I've done:
1 Download the linux code from ...
1
vote
2answers
161 views
top/htop not showing CPU usage of kernel processes
I'm trying to improve FPS from a USB webcam. Supposedly I should be able to use htop to show where the bottleneck is, since top won't show kernel processes such as time spent waiting for disk access. ...
1
vote
0answers
63 views
How can I read and write data to a Character Device File in Linux with PHP?
I'm trying to read and write to modules on the I2C bus on a Raspberry Pi using PHP. I'm using fopen() and fskeek().
Below is the code I've been trying to use to read data coming in from the physical ...
1
vote
0answers
181 views
How do I install webcam firmware on the Raspberry Pi?
I want my Raspberry PI to be able to use this cheap webcam I bought from China.
Identified as
17a1:0128 TASCORP
After quite a bit of searching I found a post from someone who had got it to ...
2
votes
2answers
428 views
Raspbian source code
I´m using Raspbian on RaspBerry Pi and it´s working ok, but now I want to modify the distro according to my needs.
I know the source for the kernel is found in kernel.org, but I haven't been able to ...
2
votes
1answer
113 views
Schedule periodical processes
I have a project that I´ll be using RaspBerry Pi to make a controller for process control.
To do that I need to schedule processes periodically. Does anyone know how I could do that? So I have to ...
2
votes
2answers
84 views
Install Linux Kernel
How can I compile a basic linux kernel on Rpi, or is it possible in a any way?
I want a very basic linux with nothing on it but just Linux.
Let me know if there are any alternatives or suggestions.
0
votes
1answer
105 views
Raspbian missing modules in lsmod output
when I type lsmod I get the output below. But I am missing all the other but the sound modules. Why are no other modules shown?
I am using the latest Raspbian release (12/16/12)
root@raspberrypi:~# ...
0
votes
2answers
2k views
Kernel panic, unable to mount root fs on unknown-block after restart
My Raspberry Pi has been hosting a small site from home for a few days, and everything was working fine.
It's completely headless, so I use SSH for everything.
This morning however when I woke up, I ...
3
votes
1answer
347 views
Bare Metal Assembly/C(++) Programming
I'm trying to make a small os on my Raspberry Pi.
I have good assembly and strong c/c++ knowledges but I need some help.
For my first experiments I worked with Qemu and it's serial output but now I ...
7
votes
2answers
7k views
How do I upgrade Raspbian?
I have my RPi setup how I want, but I have an older version than what is currently available (2012-10-28-wheezy-raspbian.zip). How do I upgrade the kernel, firmware, etc?
I have upgraded some this ...
3
votes
0answers
2k views
how to mount LCD/TFT screen on raspberry pi
Possible Duplicate
Raspberry pi has an on-board DSI connector, If I buy an LCD or TFT or touch screen which has the DSI connector, could I mount it on the RPI? Does it require any additional firmware ...
3
votes
2answers
450 views
Multiplexing 4-digit 7-segment display is flickering
I connected a 4-digit 7-segment display to the GPIO-port. It uses 8 ports for the LEDs and 4 ports for multiplexing via PNP-transistors. It is running so far with a loop written in C program:
...
2
votes
0answers
494 views
raspberry pi booting failed on custom kernel
hello I have compiled my custom kernel and pack initramfs into it. I have created two partition fat32 and ext3. fat32 contains bootloaders and kernel and ext3 contains rootfs. I have made a raw disk ...
8
votes
2answers
2k views
building kernel image (.img) including ramdisk
I have build my Linux kernel (3.0.1) for my raspberry pi with those following steps.
1. Downloading kernel source
2. tar xvf source.tar.bz2
3. downloading arm cross compilation tool.
4. tar xvf ...
4
votes
1answer
241 views
Periodic task in kernel module
I currently developing a gpio based kernel module for a custom protocol.
as per requirements of protocol, i have to send data, clock and enable signal to output device throgh gpio.
this data is ...
3
votes
0answers
112 views
How do I roll back a kernel upgrade?
I am using the Occidentalis distro and stupidly ran apt-get upgrade without thinking about the repercussions. After a reboot I now am on a stock kernel, which means I lost kernel support for OneWire, ...
5
votes
1answer
4k views
What kernel parameters are available for fixing USB problems
There's a lot of problems with USB stack on Rapsberry Pi and developers are working hard to fix as many of them as possible. They introduce some kernel modules options (like dwc_otg.fiq_fix_enable) ...
7
votes
3answers
245 views
Current state of I2C in Kernel and Kernel version in general
I need to use kernel drivers for some I2C peripherals, so I need kernel I2C support. As already discussed in a previous question, the current 3.1.9 kernel doesn't provide support for the SoC's I2C ...
2
votes
1answer
112 views
What Distro Are The Stock Images Built For?
When I take a look at the firmware github repo I can download kernel images. But to what distro do they belong, are compatible to?
3
votes
1answer
274 views
Unloading kernel module does not remove /dev/ device file
I have had success following tutorials for developing kernel modules, running them on a Ubuntu 12.04 LTS virtual machine. Particularly the example in this tutorial works fine on Ubuntu on a 3.2.0 ...
12
votes
1answer
2k views
What is the difference between Raspbian kernels in official image?
In the official Raspbian "wheezy" image (2012-07-15), there are three Kernel images:
kernel.img (6MB)
kernel_cutdown.img (4MB)
kernel_emergency.img (16MB)
I'm curious what are the technical ...
4
votes
1answer
275 views
No modules found in custom Arch kernel
In order to test the patch linked to in the following post: https://github.com/raspberrypi/linux/issues/29#issuecomment-6884170 I need to compile a custom kernel for my pi.
To do this I followed the ...
6
votes
0answers
458 views
Arch Linux kernel panics and firmware not working
Before the update I had linux-raspberrypi-3.1.9-33-arm and raspberrypi-firmware-20120418-2 installed. After I upgraded to raspberrypi-firmware-20120729-1, the kernel refused to boot (no kernel panics ...
7
votes
2answers
7k views
Where is the kernel source for Raspbian's default 3.1.9+ kernel?
The default kernel version of Raspbian is 3.1.9+. When I try to compile an extra kernel module I have lots of error messages since the kernel header files are missing. I've checked the Raspbian ...
