microcell device

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

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

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

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

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

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

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