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Unit 2: Red Hat Linux 9 Basics

We can use the Red Hat configuration tool redhat−confi g−xfree86 in order to check or modify the Notes
video card as well as monitor settings of the display. This can be done by typing this command at
the command line. Alternatively, choose Main Menu Æ System Settings Æ Display. The Figure
2.19 shows the dialog box which appears on the execution of this tool.
Figure 2.19: Display Setting

PCIs and USBs

Peripheral Component Interconnect (PCI), as its name implies is a standard that describes how
to connect the peripheral components of a system together in a structured and controlled way.
The standard describes the way that the system components are electrically connected and the
way that they should behave.

The PCI initialisation code in Linux is broken into three logical parts:
PCI Device Driver

This pseudo-device driver searches the PCI system starting at Bus 0 and locates all PCI devices
and bridges in the system. It builds a linked list of data structures describing the topology of the
system. Additionally, it numbers all of the bridges that it fi nds.

PCI BIOS

This software layer provides the services described in bib-pci-bios-specification. Even though

Alpha AXP does not have BIOS services, there is equivalent code in the Linux kernel providing
the same functions,

PCI Fixup

System specifi c fixup code tidies up the system specific loose ends of PCI initialization.

List all PCI Devices
lspci is a utility for displaying information about PCI buses in the system and devices connected
to them. By default, it shows a brief list of devices. Use the options described below to request
either a more verbose output or output intended for parsing by other programs.

lsusb – List USB Devices

To make use of all the features of this program, you need to have a Linux kernel which supports
the /proc/bus/usb interface (e.g., Linux kernel 2.3.15 or newer).

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