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TV on Linux Print E-mail

A number of cards exist allowing you to watch and record TV on your PC. Most come with software for
Windows only, like so many things, but it is possible to do the same thing on Linux.
Linux comes with several drivers which make up the Video4Linux drivers. Several cards are supported by
these drivers, and a list of them is available at http://roadrunner.swansea.linux.org.uk/v4l.shtml. This is the
driver side. You also need software to use the devices.
Several programs are available to watch TV, capture images and even Web applications. A list of some of the
programs is available at http://www.thp.uni-koeln.de/~rjkm/linux/bttv.html including datasheets.
Can't mount root fs Print E-mail

When you boot a system, this is an error that will halt the system. This error means that the kernel can't
mount the root file system, so it can't get all of its configuration files.
There are a few cases where this happens:
иа No IDE support in the kernel. If your main hard drive is an IDE, and you have recompiled
without including "Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support" or some other
basic IDE device drivers.
иа File system not supported. Usually the root file system should be of type ext2. You need to
make sure that ext2 is compiled in the kernel, and not as a module because you can't load
modules without first mounting the root file system.
иа The drive is not ready. If you have removed the drive, the hard disk died or the BIOS didn't
detect the device for some reason, then the kernel won't be able to mount it.
Reading a foreign file system Print E-mail

File systems are defined in the kernel. The kernel supports many file systems, but they need to be compiled
in, or compiled as a module. When you compile a file system in the kernel, all you need to do is use mount
with the -t option and the right file system type.
If you have compiled a driver for a file system as a module, then you need to load the module first.
Here are a few of the available file systems:
иа msdos: This is the FAT file system used by DOS.
иа vfat: This is the FAT32 file system used by Windows 95 and Windows 98.
иа ext2: This is the default Linux file system.
иа iso9660: This is the default CD-ROM format.
Added processors Print E-mail

Dual processors are becoming more and more popular in computers. Of course, you won't be able to see
much performance increase in Linux unless you tell Linux about the second CPU. Here is how to do it.
Go in the kernel, and enable SMP. SMP means Symetric Multi-Processing and tells the kernel that more than
one processor can be used.
After a reboot, Linux should tell you that it has detected 2 processors and what their status are.
Blinking leds on the keyboard Print E-mail

Keyboard leds are pretty boring. Usualy you know if the num lock is on or if you are writing in upper case
letters. Could we make them do something more useful? Of course.
The keyboard leds can be controlled by a device driver called the misc driver. That driver can control all
kinds of misc things. You could write your own driver to make them blink or light up at any system event.
A program called tleds is available from http://www.hut.fi/~jlohikos/tleds.html. That program will have them
blink based on network usage. One will blink when packets go in, and the other when packets go out.
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