全部博文（52）
分类： LINUX
2008-12-07 15:07:33
This directory holds virtual files that reflect the current state of the CD-ROM subsystem.
1 autoclose
If enabled (1), the drive(s) will close tray upon mount request. It is the default.
2 autoeject
If enabled (1), the drive(s) will eject media after unmount request. The default is 0 (don't eject on unmount).
3 check_media
Check media type capability status. Disabled (0) by default.
4 debug
Turn on (1) or off (0) debugging messages of the CD-ROM device driver. Off by default.
5 info
This read-only file contains general information about the CD-ROM drives attached to the system.
Example output:
CD-ROM information, Id: cdrom.c 3.20 2003/12/17
drive name: hdd hdc
drive speed: 0 40
drive # of slots: 1 1
Can close tray: 1 1
Can open tray: 1 1
Can lock tray: 1 1
Can change speed: 1 1
Can select disk: 0 0
Can read multisession: 1 1
Can read MCN: 1 1
Reports media changed: 1 1
Can play audio: 1 1
Can write CD-R: 0 1
Can write CD-RW: 0 1
Can read DVD: 1 1
Can write DVD-R: 0 1
Can write DVD-RAM: 0 0
Can read MRW: 1 1
Can write MRW: 1 1
Can write RAM: 0 1
6 lock
If enabled (1), lock the door on device open. It is the default.
二 hpet
The High Precision Event Timer (HPET) hardware is the future replacement for the 8254 and Real Time Clock (RTC) periodic timer functionality. It includes max-user-freq；max-user-freq：Allow user to define the upper limit of number of interrupts generated by the HPET driver. The default value is 64.
三 mac_hid：此目录主要是关于鼠标，键盘等一些设置信息
四 parport
This directory contains information about the parallel ports of your system. It has one subdirectory for each port, named after the port number (0, 1, 2...).
1 default
The defaults for spintime（The default forspintime. When a new port is registered, it picks up the default spintime.） and timeslice（The default for timeslice. When a new device is registered, it picks up the default timeslice）.
2 parport0
Collection of files describing first parallel port.（
1> autoprobe:Any IEEE-1284 device ID information that has been acquired from the (non-IEEE 1284.3) device; 2>autoprobe1,2,3,4:IEEE 1284 device ID information retrieved from daisy-chain devices that conform to IEEE 1284.3; 3>devices:Device subdirectory.It includes active(A list of the device drivers using that port. A "+" will appear by the name of the device currently using the port (it might not appear against any). The string "none" means that there are no device drivers using that port.)and lp (Example device subdirectory.It includes timeslice(The number of milliseconds that a device driver is allowed to keep a port claimed for. This is advisory and driver can ignore it if it must.))4>irq :Parallel port's IRQ, or -1 if none is being used. 5>spintime:The number of microseconds to busy-loop while waiting for the peripheral to respond. You might find that adjusting this improves performance, depending on your peripherals. This is a port-wide setting, i.e. it applies to all devices on a particular port. 6>base-addr:Parallel port's base address, or addresses if the port has more than one in which case they are separated with tabs. These values might not have any sensible meaning for some ports; 7>dma :Parallel port's DMA channel, or -1 if none is being used.
8>modes: Parallel port's hardware modes, comma-separated, meaning:
- PCSPP - PC-style SPP registers are available.
- TRISTATE - Port is bidirectional.
- COMPAT - Hardware acceleration for printers is available and will be used.
- EPP - Hardware acceleration for EPP protocol is available and will be used.
- ECP - Hardware acceleration for ECP protocol is available and will be used.
- DMA - DMA is available and will be used.
Note that the current implementation will only take advantage of COMPAT and ECP modes if it has an IRQ line to use.
五 raid
The following interfaces can be used to control RAID reconstruction speed.
1 speed_limit_max
RAID reconstruction code is expected to only access disks when there is no disk activity due to applications. With this tunable you can set the maximum speed in KB/s in that case. The default is 200000 KB/s.
2 speed_limit_min
RAID reconstruction code is expected to only access disks when there is no disk activity due to applications, with a guaranteed minimum set by this tunable (in KB/s). The default value is 1000 KB/s.
六 scsi
Configuration of the SCSI driver.
1 logging_level
This defines the scsi logging feature. It is a means by which the user can select how much information they get about various goings on, and it can be really useful for fault tracing. The logging word is divided into 8 nibbles, each of which describes a loglevel. The division of things is somewhat arbitrary, and the division of the word could be changed if it were really needed for any reason. For more info see /usr/src/linux/drivers/scsi/scsi_logging.h
七 rtc
Configuration of the real time clock (RTC) driver.
1 max-user-freq
Allow user to define the upper limit of number of interrupts generated by the real time clock driver. The default value is 64.