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http://blog.csdn.net/zqixiao_09/article/details/50888795 We have learned the theoretical knowledge of platform devices in front of Linux device driver development--platform device driver, the following will be an example to delve into our learning. first, the platform driven work process Platform model-driven programming requires the implementation of Platform_device (

The character device or block device definition belongs to the device access layer of the operating system, which is not necessarily related to the characteristics of the actual physical device. The driver is under the device access layer, so you only need to provide the dri

This article is mainly about why Apple launched iOS 5 in August 2011 to reject the Udid of the app acquisition device and the Udid replacement program, especially to remind developers that Apple App Store prohibits access to the Udid app shelves (recommended: app is Apple app Store rejected for n reasons), the following first to understand the next udid.What is Udid?The full name of Udid is unique device Id

1, after the system plugged into the USB device, from the console interface has the following prompt:From the console information, you can see the inserted USB device name.As you can see, the plugged-in USB device is sde4.However, if the CRT tool is remotely connected to the past, you can use the following command to view the USB

According to ldd3, the Linux device model can be considered as an advanced textbook, which is unnecessary for most program authors. But I personally think: For an embedded Linux underlying programmer, this part of content is very important. For example, I learned about ARM9. many bus (such as SPI, IIC, IIS, and so on) have been written into subsystems in Linux, and no driver needs to be written by myself; unlike PCI, USB, and other tutorials on ldd3,

===============================This article is the original site, welcome to reprint!Reprint please indicate the source: http://www.cnblogs.com/gdt-a20 =============================== The kernel developer will be the bus, device, drive the three are abstracted from the software idea, cleverly established the relationship between the two, make it more visualization. Combined with the knowledge that we have learned before, in general, the relationship b

10.1 turning the device on and off10.1.1 The definition of a device -anything that can be communicated with in Windows.(1) common equipment and uses Equipment Use function to open the device File Permanently store any data CreateFile (Pszname is a pathname or a UNC path name) Directory Settings f

From one point of view, the role of a device driver is to provide a mechanism, not a policy. When writing drivers, programmers should pay particular attention to the following basic concept: When writing kernel code to access hardware, do not impose any specific policy on the user. Because different users have different needs, the driver should handle the problem of how to make the hardware available, and how to use the hardware problem left to the up

Android Device Manager Vulnerability 2: prevents users from activating the Device Manager, android2 -- In June 2013, Russian security vendor Kaspersky found the most powerful mobile trojan in history-Obad. a. This Trojan exploits an unknown Android Device Manager Vulnerability (ANDROID-9067882). A mobile phone trojan that has activated the permission of the

Unable to uninstall the device. This device may be required when the computer is started Network2008-03-03 13:36:52 Read2437 Comment1 Font Size:LargeMediumSmallSubscription Some problems occur after a new Nic is installed.When setting the IP address, a dialog box is displayed: the IP address you entered for this network adapter has been assigned to another adapter ...... It probably means that the origi

Environment: Solaris 10,oracle 11.2.0.4 2nodes RACSymptoms: Rman backup error is as followsRMAN-00571: ===========================================================RMAN-00569: =============== ERROR MESSAGE, STACK follows ===============RMAN-00571: ===========================================================Rman-03009:failure of allocate command on DEV_0 channel at 12/05/2014 10:25:25Ora-19554:error allocating device,

Device files: block Device file B: A device that is randomly accessed by block;character device file C : by character, linear device;Common block device file B: HDDDevice file name for the hard disk device:IDE, ATA:HDSATA, SCSI, U

From one point of view, the role of a device driver is to provide a mechanism, not a policy.When writing drivers, the program ape should pay particular attention to the following basic concept: When writing kernel code to access hardware, do not impose any specific policy on the user. Because different users have different needs, the driver should handle the problem of how to make the hardware available. And the problem of how to use hardware is left

Linux MTD (Memory technology Device) subsystem analysisFor Atheros Char deviceRead the Linux MTD Source code Analysis to this part of the overall understanding, combined with the existing code, analysis of how Atheros MTD is used.Linux kernel:2.6.31.Atheros platform:qca9890???Refer to the Linux MTD Source code Analysis , where MTD is divided into 4 layers, from top to bottom: Character device node, characte

One: Platform bus1.1 OverviewA realistic Linux device driver usually needs to be hooked up on a bus, which is not a problem for devices that are attached to PCI,USB,IIC,SPI, but in embedded systems,The Independent peripheral controller integrated in the SOC system, the peripherals attached to the SOC memory space are not attached to such a bus. Based on this background, Linux invented a kind of virtual bus, called Platform Bus, the correspondingThe

From one point of view, the role of a device driver is to provide a mechanism, not a policy. When writing drivers, programmers should pay particular attention to the following basic concept: When writing kernel code to access hardware, do not impose any specific policy on the user. Because different users have different needs, the driver should handle the problem of how to make the hardware available, and how to use the hardware problem left to the up

Path for Linux Device Driver engineers-device model (top) Underlying model K-style Reprinted please indicate from Hengyang Normal University 08 electric 2 Y-kee http://blog.csdn.net/ayangke,QQ:843308498 I. Important knowledge points 1. sysfs File System The sysfs file system is a special file system similar to the proc file system. It exists in the memory and is mounted to the memory by the kernel when th

1. Overview 2. system initialization platform device 3. The driver uses platform device 1. Overview The Linux-2.6.11 introduces the concept of a device model that mounts most device drivers to a virtual bus. Its purpose is: 1) provides friendly user interfaces. You can find the corresponding drivers and devices und

The following is my excerpt and translation, want to know more text at the end of the link ha ~Comparison of common values for-webkit-min-device-pixel-ratio ( is the physical pixel and device independent pixels on the device, device pixel ratio )Device resolution

Asynchronous device I/O Basics Assume that a thread sends an asynchronous I/O Request to the device. This request is sent to the device driver, which is responsible for actual I/O operations. When the driver is waiting for the response from the device, the application thread is not suspended because it is waiting for t