Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 40)

40 Chapter 2. The /proc File System

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2

B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0

D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1

P: Vendor=0000 ProdID=0000 Rev= 0.00

S: Product=USB UHCI Root Hub

S: SerialNumber=d400

C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA

I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub

E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms

2.3.3. /proc/driver/

This directory contains information for speciﬁc drivers in use by the kernel.

A common ﬁle found here is rtc, which provides output from the driver for the system’s Real Time

Clock (RTC), the device that keeps the time while the system is switched off. Sample output from

/proc/driver/rtc looks like this:

rtc_time : 01:38:43

rtc_date : 1998-02-13

rtc_epoch : 1900

alarm : 00:00:00

DST_enable : no

BCD : yes

24hr : yes

square_wave : no

alarm_IRQ : no

update_IRQ : no

periodic_IRQ : no

periodic_freq : 1024

batt_status : okay

For more information about the RTC, review /usr/src/linux-2.4/Documentation/rtc.txt.

2.3.4. /proc/ide/

This directory holds information about IDE devices on the system. Each IDE channel is represented

as a separate directory, such as /proc/ide/ide0 and /proc/ide/ide1. In addition, a drivers

ﬁle is also available, providing the version number of the various drivers used on the IDE channels:

ide-cdrom version 4.59

ide-floppy version 0.97

ide-disk version 1.10

Many chipsets also provide an informational ﬁle in this directory that gives additional data concerning

the drives connected through the various channels. For example, a generic Intel PIIX4 Ultra 33 chipset

produces a /proc/ide/piix that will tell you whether DMA or UDMA is enabled for the devices

on the IDE channels:

Intel PIIX4 Ultra 33 Chipset.

------------- Primary Channel ---------------- Secondary Channel -------------

enabled enabled

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 40

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