10-22-2013
Quote:
Originally Posted by
Lost in Cyberia
hey everyone, just a general question. I did an lspci on my home computer, and it got me thinking... When I hear pci..I think of the physical slots on your motherboard. usually beige in color.. But the list returned to me is of atleast 20 items. None of which, (besides the graphics card) is plugged into a pci slot... Some things like memory controller, 1,4,5, high definition audio, Address map, DRAM controller, and the most bizarre, Serial ATA Controller... So does this mean, that these devices built onto the motherboard are using the same PCI bus that have the two slots on my board? And why is a SATA controller using a PCI bus? And lastly, how many devices can all comfortably live on 1 bus? Or are all these different PCI buses?
Don't get offended at my suggestion, but you might want to invest in a book that describes how computer hardware works. The concept of a data bus is not new, and a book on the subject would give you a better understanding.
The bus does not need to have any physical slots. Laptops use PCI bus, and have no physical PCI slots. The slot is simply to allow expansion, to add new things onto the bus. Also there is PCI which is a parallel bus with shared bandwidth, and there is PCI-E, which is serial with dedicated bandwidth in a star topology. Lastly, yes a machine can have more than one bus. This is most common in servers, which need to support larger I/O workloads than a desktop.
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LEARN ABOUT XFREE86
pcitweak
PCITWEAK(1) General Commands Manual PCITWEAK(1)
NAME
pcitweak - read/write PCI config space
SYNOPSIS
pcitweak -l
pcitweak -r PCI-ID [-b|-h] offset
pcitweak -w PCI-ID [-b|-h] offset value
DESCRIPTION
Pcitweak is a utility that can be used to examine or change registers in the PCI configuration space. On most platforms pcitweak can only
be run by the root user.
OPTIONS
-l Probe the PCI buses and print a line for each detected device. Each line contains the bus location (bus:device:function), chip
vendor/device, card (subsystem) vendor/card, revision, class and header type. All values printed are in hexadecimal.
-r PCI-ID
Read the PCI configuration space register at offset for the PCI device at bus location PCI-ID. PCI-ID should be given in the form
bus:device:function, with each value in hexadecimal. By default, a 32-bit register is read.
-w PCI-ID
Write value to the PCI configuration space register at offset for the PCI device at bus location PCI-ID. PCI-ID should be given in
the form bus:device:function, with each value in hexadecimal. By default, a 32-bit register is written.
-b Read or write an 8-bit value (byte).
-h Read or write a 16-bit value (halfword).
SEE ALSO
scanpci(1)
AUTHORS
David Dawes (dawes@xfree86.org).
XFree86 Version 4.7.0 PCITWEAK(1)