A Linux device model can be better understood through various stages of a device's life cycle in the kernel. I will analyze the source code of ldquo and sculld to understand the integration of each link in the Linux device model. The integration of the (PCI Bus) in ldd3 serves as a reference, because embedded Linux uses less PCI bus. First, you must familiarize yourself with the source code of ldquo and scu
Platform device registration analysis:/* for the following resources, read the chip manual and view the schematic diagram */---------------------------------------------------------ARCH/ARM/plat-s3c24xx/Devs. c/* Most device controller resources are defined here *//* LCD controller */Static struct resource maid [] = {[0] = {. Start = s3c24xx_pa_ LCD,. End = s3c24xx_pa_ LCD + s3c24xx_sz_ LCD-1,. Flags = iore
One: Load good sbull drive[Email protected]:/# ls/dev/sbull-l brw-r--r--1 root root 254, Mar 08:25/dev/sbull [email protected]:/#You can see that the Sbull file property is a block device, the main device number is 254, the secondary device number is 16Second: Partition the device[Email protected]:/# fdisk/dev/sbull [2
Linux device drivers are in the form of kernel modules, but the modules are not necessarily drivers. The driver can be compiled into the kernel, when configuring the kernel, if a configuration item is set to M, then it will be compiled with the kernel compiled into a module, but to add drivers to the kernel will make the kernel very large, and in addition, modify, delete the driver need to compile the kernel again, this is extremely troublesome. So th
Now the network is more and more common, more and more knowledge, the need for more memory, so the U disk is more and more widely used. All we have to do is to have a small U-plate to store all the files. But we also had a little trouble using the U disk. After we use the U disk, the Win7 system prompts "The device is in use" when it exits safely. Close any programs or windows that may be using the device,
Tags: adb shell multi-device adbIn our usual use of the ADB tool, you may encounter such problems, when the computer is linked to multiple devices, the simple use of the ADB shell link device, there will be an error. Let's take a specific look at how to deal with this situation: 1. First, we need to know which devices are linked to each other on the computer. Use the following command to return to the
The Win8 method for disabling a device in Device Manager is as follows:
1. At the same time, hold down the "Windows logo" and "X" keys on the keyboard, and open the Device Manager at the System tool shortcut entrance.
2. Before the device class you want to disable, click to expand the view of the
Win10 after the update, Bluetooth function is gone, there is no option to open the Device Manager, there is an unknown USB device, reboot invalid, reload Bluetooth driver is invalid, Bluetooth in the BIOS is open.Try to find all the methods on the Internet, including Update WIN10 update, update Bluetooth driver, etc. are not resolved,Solutions are:1. Open the Device
How to crack the mobile phone shielding device/signal jamming device
I believe that students in the past few years know what it is and the most common radio interference equipment in the test room. The main cause is to interfere with the cell phone signal in the nearby area and cause the cell phone signal to lose connection with the base station.Interference principle
Within a certain frequency range, mob
Linux character devices-automatically create device numbers and device nodes, linux nodes
Linux character devices-automatically create device numbers and device nodes
First, write an example and APP that automatically assigns a character device number and a
Some time ago, I have been engaged in the application software of the GPS navigation system. Recently, it has come to an end. I continue to pick up the driver of the Linux device!
The last time I recorded the module initialization code, I checked the code for uninstalling the module this time.
Void scull_cleanup_module (void)
Let's take a look at scull_trim.
/*
* Empty out the scull device; must be called
Device-related bitmapDDB (device-dependent-Bitmap)
DDB does not have its own color palette information. Its color mode must be consistent with that of the output device. For example, the pixel value stored in a bitmap with less than 256 colors is the index of the system palette, and its color depends on the system palette. Because DDB is highly dependent on the
First verify that the Bluetooth device is connected to your notebookNext, right-click on the "Sound control" icon in the lower-right corner of the screen---> select the "Play" Settings optionNext select the Bluetooth device line in the playback options, right-click on the option, select "Connect",When you select test, the Bluetooth device will sound the test voic
Determine device type1,Split View Controller(Uisplitviewcontroller) in the iphone application, the navigation controller is used to enter the next layer of interface from the previous interface. But the ipad screen is large and usually uses Splitviewcontroller for navigation (this is the ipad-specific view controller). On the horizontal screen, a navigation list is displayed on the left, and the corresponding details are displayed on the right.In the
Apply the configuration device to development and apply the configuration device
To run an application on a device,
First, set the device to allow it to run non-Google Play Store applications:
For devices of Android 4.1 or earlier versions, select "Settings"> "application items" and select "Unknown Source.
For Android
Popular Science:UDID is a 40-string sequence of substrings and numbers that distinguishes each unique iOS device, including IPhones, IPads, and IPod touches
As Apple gets more and more strict in the program to get Udid, the private API has not got the information such as the Udid,mac address, and then the use of keychain with the UUID and so on is implemented in disguise
Due to the recent project requirements is the form of equipment licensing use of
Python to monitor the port usage of the device, python to monitor the port usage of the device
This example describes how to monitor the port usage of a device using Python. Share it with you for your reference. The details are as follows:
Recently, due to work requirements, the above requirements need to be reported daily O M of hundreds of port usage [], altho
Prior to Linux3.1, board-level information is generally stored in the/arch/arm/mach-** directory for devices on a typical arm platform.The files for the device tree are stored in the/arch/arm/boot/dts/***.dts directoryThe purpose of the device tree introduction:Avoid the duplication of individual vendor code, accelerating the development of the Linux kernel BSP. Compiling a mirror can support multiple diffe
After a block device is mounted, you can view the file system information for the device via the DF or Mount command. However, sometimes it is necessary to judge without mounting the device, and the following method can be used:(1) View file system type command: File-sl/dev/testvg/lv0 Sample output:/dev/testvg/lv0:linux Rev 1.0 ext2 FileSystem data (large files)
Tags: Linux device directory mount device Unable to view problem resolutionDevice mount take the optical drive as an example, first in the virtual machine VMware in the optical drive to add a mirror to confirm that the optical drive is working[Email protected] ~]# Cd/dev/cdrom-BASH:CD:/dev/cdrom: Not Directory[Email protected] ~]# Ls/dev/cdrom/dev/cdrom[[email protected] ~]# mount/dev/cdrom/mnt (Attach cdro
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.