Stuff about Linux
Hi,
in a previous post I have descriped how to compile the eibd daemon for the Raspberry PI. Here is a sample debian startscript to start eibd at system boot.
Login as root at your EIBd box and created a user under which the daemon should run.
useradd eibd -s /bin/false -U -M
Create the script eibd in /etc/init.d
Continue reading KNX/EIB: System V startscript for eibd
Hello,
if you want to use the Raspberry PI as a EIB/KNX Gateway or Tunnel you must compile the eibd sources from the scratch, because no precomplied binaries are currently available.
There are two ways to build the eibd. Compiling directly on the Raspberry PI or you compile it on your i386 PC. The last option means you have to “cross” compile the sources, because the RapsberryPi has a different processor architecture than your Intel/AMD PC. Here are the steps to build the eibd on an i386 using a crosscompiler for the ARM architucture.
I verfied the steps at a minimal debian system in a VirtualBox. So it is reproducible:-)
Install all necessary packages. Login as root
apt-get -y install git rsync cmake make gcc g++ binutils automake flex bison patch
Now you can Login as a “normal” user. Define a working folder
export BUILD_PATH=~/eibdbuild
mkdir -p $BUILD_PATH
cd $BUILD_PATH
We need a cross compiler respectively the toolchain for the arm1176jzf arm processor.
Continue reading Raspberry PI: Cross compiling the KNX/EIB eibd
Hi,
there are several ways to mount a partition which is within a diskimage file created for example with dd.
The first and hard way is to determine the offset of the partition start sector and mounting the disk by specifing the offset as parameter for the loop device.
You can use the file or fdisk command to examine the file.
root@ubdev:/mnt/RaspberryPI # file 2012-07-15-wheezy-raspbian.img
2012-07-15-wheezy-raspbian.img: x86 boot sector; partition 1: ID=0xc, starthead 130, startsector 8192, 114688 sectors; partition 2: ID=0x83, starthead 165, startsector 122880, 3665920 sectors, code offset 0xb8
or
root@ubdev:/mnt/RaspberryPI# fdisk 2012-07-15-wheezy-raspbian.imgCommand (m for help): pDisk 2012-07-15-wheezy-raspbian.img: 1939 MB, 1939865600 bytes 255 heads, 63 sectors/track, 235 cylinders, total 3788800 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000714e9Device Boot Start End Blocks Id System2012-07-15-wheezy-raspbian.img1 8192 122879 57344 c W95 FAT32 (LBA)2012-07-15-wheezy-raspbian.img2 122880 3788799 1832960 83 Linux
For example the startsector of partition 2 is 122880, this multiplied with the 512 bytes per sector is the byte offset of the partition. 122880*512=62914560.
Continue reading Linux: Multiple ways to mount a partition in a disk image file
Hi,
today I will explain how to easy it is to automatically mount a windows share on linux.
The following packages are necessary: autofs, cifs/samba client tools
In this example I use a debian linux system.
root@dev # apt-get install autofs cifs-utils
edit the auto.master file with your favorite editor:
root@dev # vi /etc/auto.master
add the following line
/media/cifs /etc/auto.cifs --ghost
/media/cifs – is the root directory where the mount points are created (this is not the mount point itself!), the directory must exist./etc/auto.cifs – the definition file of the mount points--ghost This option will create the mount point permanently, even the share isn’t mounted (there are doubledashes before ghost:-))Create a new file /etc/auto.cifs and add your share definition. In this example the Windows computer is mediaserver with the share multimedia$ (Note: you have to quote the $ character in auto.cifs file or you got cifs_mount failed w/return code = -6). The share should be mounted as user michl which has UID 1000 and GID 1000. Insert the following line to /etc/auto.cifs:
root@dev # touch /etc/auto.cifs
root@dev # vi /etc/auto.cifs
Continue reading Linux: Automount Windows or Samba shares
Hi,
I have running a debian based multimedia server. The operating systems is installed on a compact flash card (/dev/sda), the data resides on a external USB SATA harddisk (/dev/sdb).
The (Server 🙂 ) Hardware is a Fujitsu Futro A240 ThinClient, with a power consumption of only 7W. I’m using the server for about 2 hours each day, therefore I looked for a method to save power and switch the USB disk to standby mode when its idle for while.
Check first if your hard disk supports the standby mode. Ensure that the disk is idle, otherwise the disk is immediately active again.
Switch to Standby mode
root@debdev:~# hdparm -y /dev/sdb
Continue reading Linux: Switch a idle hard disk into standby mode