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/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android small Novice Linux * device driver Development Learning Journey * Topic: Concurrency and race in Linux device drivers * date:2014-11- 04 */1, concurrency, and race concurrency (concurrency) refers to multiple execution units being executed concurrently and concurrently

Error 1:# insmod Memdev.ko insmod:cannot insert ' Memdev.ko ': Device or resource busy cause analysis: Due to the application of a static application of the device number of the character device driver, the main device number is 254, and the department The equipment number of the system has clashed, so we have to chan

Linux Device Driver Programming-Linux general technology-Linux programming and kernel information-complex device driver-the following is a detailed description. The complex device drivers mentioned here involve PCI, USB, network devices, Block devices, and so on (strictly speaking, these devices are not in the same concept, for example, they are tied with Block d

In the Rt-thread 2.0.0 formal version of the introduction of PIN devices as miscellaneous devices, its device driver files pin.c in Rt-thread-2.0.1\components\drivers\misc, mainly for the operation of Chip Gpio, such as light led, Keys and so on. At the same time for the corresponding chip platform, you need to write the underlying GPIO driver, such as GPIO.C.One, in PIN.C defines a static PIN device object

The Android device selection list is displayed, and the Shell script of the specified Android device Console is displayed. If a PC is connected to multiple Android devices (including Android simulators), you must use adb-s deviceid shell when entering the Console. This article has compiled a Shell script file (which can be used in Linux or OS X, and bat or cmd in windows ).First, use the adb devices command

Transferred from: http://blog.csdn.net/yikai2009/article/details/8653697Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.Directory (?) [-] Blocking Blocking operations Non-blocking operation Blocking mode-read-implementation Blocking mode-write-implementation Non-blocking read and write operations Implementation of instance---read blocking Instance---key driver blocking implementation

Linux character Devices - automatically create device numbers and device nodesFirst write an example of automatically assigning a character device number and device node and the APPManual Installation steps:Insmod My_char_dev.koNo more device nodes to installThen the test ap

I. What is IOCTL?IOCTL is a function used by the device driver to manage the device's I/O channels. The management of the I/O channel is to control some features of the device, such as the Serial Transmission baud rate and the motor speed. The number of calls is as follows: Int IOCTL (int fd, IND cmd ,...); FD is the File Identifier returned by the open function when the user program opens the

[Oracle @ node1 crsd] $ crs_stat-t CRS-0184: Cannot communicate with the CRS daemon. [Oracle @ node1 crsd] $ crsctl check crs Failure 1 contacting CSS daemon Cannot communicate with CRS Cannot communicate with EVM [Root @ node1 crs] # ps-ef | grep crs Root 3926 1 0 :46? 00:00:00/bin/sh/etc/init. d/init. crsd run Root 29408 25855 0 00:00:00 pts/1 grep crs [Root @ node1 bin] #./racgvip There is no VIP name [Root @ node1 crsd] #/etc/init. d/init. crs stop Shutting down Oracle Cluster Ready Ser

After the crazy batch of a vendor's multimedia control app how rotten, bombast himself to do a minute thing. Of course, to do a very easy, more than their rotten software is still confident. The process encountered various pits, one of which was as followsJust start with a tablet to debug, always pop up the window to select the device, so tick "Use same device for the future launches", so eclipse by default

Tags: logout flags function device fun argv hrd none lapThe code is as follows#include #include#include#include#include#includeintDemo_major = -;intDemo_minor =0;intDemo_count =1;structCdev Cdev;Static struct class*Demo_class;Static structDevice *Demo_device;intDemo_open (structInode *INODEP,structFile * Filep)//turn on the device{PRINTK ("%s,%d\n", __func__, __line__); return 0;}intDemo_release (structInod

Catalogue [-] First, the judgment equipment Second, determine the network connection status Third, the device does not show the solution First, the judgment equipment 01 //设备名称 02 return[UIDevice currentDevice].name; 03 04 //设备型号，只可得到是何设备，无法得到是第几代设备 05 return[UIDevice currentDev

Transferred from: http://blog.csdn.net/rockrockwu/article/details/7357648System boot process platform device, the driver registration is complete, why in the/dev directory is automatically created a good device node?The Automatically created device node in the/dev directory can be passed class_create () and then Device_create (). But in trackingKernel platform re

U-boot device tree form get Bootargs 1. Procedure Call procedure Do_bootm Bootm_start (CMDTP, Flag, ARGC, argv) bootm_load_os (Images.os, load_end, 1) BOOT_FN = Boot_ Os[images.os.os]; BOOT_FN (0, argc, argv, images); Do_bootm_linux boot_prep_linux create_fdt (bootm_headers_t *images) Ftd_chosen

See Dr. Zhao Jiong's "Linux 0.11 source code comment" has been two or three weeks, starting from today, some personal summary and sentiment sub-standard inscribed out, chat for memory for later review.In the/linux/boot/bootsect.s of linux0.11 source code, there is a label definition Root_dev! Root_dev:0x000-same type of floppy as boot.! 0x301-first partition on First drive etcRoot_dev = 0x306Here, Root_dev is the device number of the system-specified

/*====================================================================== A Globalmem Driver As an example of char device drivers There are two same globalmems in this driver This example was to introduce the function of File->private_data The initial developer of the original code is Baohua Song ======================================================================*/ #include #include #include #include #include #include #include #include #include #in

Original blog member Wosiyin reflect, using WIN2008, right-click through my Computer to access Device Manager prompt: Because you run Device Manager on a remote computer, Device Manager runs in read-only mode. To uninstall a device or change device properties or drivers, you

Notes for compiling Linux network drivers 3.1 interrupt sharing In Linux, several devices run to share the same interrupt. If you need to share, specify the sharing method when applying. Definition of system-provided request_irq () call: Int request_irq (unsigned int IRQ,Void (* Handler) (int irq, void * dev_id, struct pt_regs * regs ),Unsigned long flags,Const char * devname,Void * dev_id ); If the sharing is interrupted, flags sets the sa_shirq attribute so that other devices can apply for t

Device number:1, self-allocation of the initiativeMajor = Register_chrdev (0, "First_drv", first_sdv_fops);//RegisterWhen you register your device with the device number 0, the kernel will voluntarily assign a master device number to return.2. Manual designationFind the main device