x230 drivers

With the release of Linux2.6, the drivers for each device are rewritten to varying degrees due to the new changes made by the 2.6 kernel. For the convenience of Linux enthusiasts, I put my own share out of this worthless file. This article lists the vast majority of changes in the 2.6 kernel with previous versions, but unfortunately the use of individual functions is not listed in detail due to limited time and effort. 1. Use the new entranceMust incl

); Read-copy-update Read-copy-update (RCU) is also an advanced mutex mechanism. Rarely used in drivers Http://www.rdrop.com/users/paulmck/rclock/intro/rclock_intro.html Optimized for situations where reads are frequent and rarely written The protected resource should be accessed through a pointer When the data structure needs to be modified, the write thread replicates first,

Sina Weibo @ song Baohua Barry at @ micro disk share Prentice. Hall Press "essential. Linux. device. Drivers" Chinese version of the high definition electronic version "Baohua _essence linuxlinuxequipment driver development" http://t.cn/zYjS7sh Contents Chapter 1 Introduction 11.1 Evolution 11.2 GNU Copyleft 21.3 kernel.org 21.4 email list and Forum 31.5 Linux Release 31.6 view source code 41.7 compile the kernel 71.8 loaded modules 81.9 installation

Write a Linux driver1. Build Linux driver skeletonLinux kernel requires load and unload drivers when using driversLoad driver: Set up device file, allocate memory address space, etc. module_init function processing driver initializationUninstall drive: Delete device files, free memory address space, etc. module_exit function processing exitA C program file containing the two macros of these two functions can also be seen as a Linux-powered skeleton2.

1. Add the Hello directory under the drives directory, containing hello.c kconfig MakefileHELLO.C content:#include #include Module_license ("Dual BSD/GPL"); static int hello_init (void){PRINTK (Kern_alert "Hello, world\n");return 0;}static void Hello_exit (void){ PRINTK (Kern_alert "Goodbye, cruel world\n");} Module_init (Hello_init);Module_exit (Hello_exit); Kconfig content:Config HELLOTriState "Hello Driver added by Dong"Default nHelpTest for adding driver to Menuconfig. Makefile content:obj-$

A quick search in the Web reveals that the number of the books that are related to Windows Device drivers can be counted with the fingers of one hand. even worse, most of the books are either too old (published before or around Windows 2000) and/or not easilyReadable. Another problem is that the Windows Driver Model (WDM) is becoming more complex as time passes, so the newer books are relatively more complex to read than the older ones. Based on all o

1. Overview I have read Linux Device Drivers 3 (photocopy) (ldd3 for short) and I have forgotten about it. So I want to take a note of what I have read before, and focus on the comments and understanding of the Code. I am also a beginner in Linux kernel, so I will introduce every detail in the learning-driven process step by step. It is hoped that these blogs will help others, like me, find new entry in the Linux driver and kernel learning field while

This example is for Android up-Reading Exploration (vol. 1): The Demo sample program included with the HAL and Driver Development book. are now pasted out for inspection.Terminal operations, commands that may be used:Insmond Word_count.kolsmod | grep Word_count to see if the driver was successfully installed Rmmod WORD_COUNTDMESG | grep word_cout | Tail-n 2 View log information with Linux driver output Cat/var/log/syslong | grep Word_count | Tail-n 2modinfo Word_count.ko View driver informationD

; Init_list_head (list); List_head (list); List_add (struct list_head *new, struct list_head *head); List_add_tail (struct list_head *new, struct list_head *head); List_del (struct list_head *entry); List_del_init (struct list_head *entry); List_move (struct list_head *entry, struct list_head *head); List_move_tail (struct list_head *entry, struct list_head *head); List_empty (struct list_head *head); List_splice (struct list_

Skb_release_data function has 0xc4 so large, and oops occurs at 0x74 place. So let's take a look at where the Skb_release_data starts:#grep Skb_release_data./system.mapC0282AF4 T Skb_release_dataSo we know that when the system error occurs, the program pointer is c0282af4+0x74=c0282b68(2) Then use GDB to view the GDB./vmlinux (executed under the Linux directory) and enter debug mode.gdb$ b *0xc0282b68Breakpoint 1 at 0xc0282b68:file NET/CORE/SKBUFF.C, line312This is to tell us in which file, in

will have to also." ”3, see example Drive, Linux kernel driver, generally have a relatively simple example code, specifically, see the first step of the TXT document. With this simple example code, we further clarify how the drive works.4, good, ready to work to complete, here should formally start. Write it yourself? No, or secretly lazy, online to find ready-made, there is just your chip driver, really lucky, direct use, of course, often can not be used directly, to debug under the next line.

code under default and clean starts with the TAB key.Third, compile the Globalvar modulePut the previous globalvar.c file and the makefile file in the same folder, I was placed in the Globalvar folder I created, go to the Globalvar folder, open the terminal, and then log in root permissions, enter the make command compile module. Four, write the test program of the Globalvar module, name it test_globalvar.c, the source code is as follows: #include Compile the test file in the terminal input Di

this driver"10. When the driver installation succeeds, you can see that the output of the debug message "Hello from Pnpdriver", the output statement you can find in the DriverEntry function of your source code.11. To end the debugging, remember to click "Debug"-"End debugging".12. The next time you continue debugging without restarting the virtual machine, you can use the built-in pipeline directly. Hit a breakpoint below to try.13. Commissioning situation:Problem Collection1. There are no VISU

, depending on the break flags to determine whether the send is completed or accepted.static irqreturn_t dm9000_interrupt (int irq, void *dev_id){if (Int_status ISR_PRS)-accepts data interrupts.Dm9000_rx (Dev);if (Int_status isr_pts)Dm9000_tx_done (dev, db);}static void Dm9000_tx_done (struct net_device *dev, board_info_t * db){Netif_wake_queue (Dev); --wake-up waiting queue}2.5 Data AcceptanceFor data acceptance, the data is actually read from the media buffer and then submitted to the upper

atomic variable, assigned a value of 1*/ Static intXxx_open (structInode *inode,structFile *Filp) { ... if(!atomic_dec_and_test (xxx_available))/*A test value of 0 returns true otherwise false*/{atomic_inc (xxx_available); return-Ebusy;/*has been opened*/ } ... return 0;/*Success*/ } Static intXxx_release (structInode *inode,structFile *Filp) {Atomic_inc (xxx_available);/*releasing the device*/ return 0; }Spin lockspinlock_t lock; /* Definition */Spin_lock_init (

Import SysImport OSImport ShutilImport timeOs.system (' pip install Selenium ')File_name= "IEDriverServer.exe"#获取路径Python_path=os.path.dirname (sys.executable)system_path=os.environ[' windir ']+ ' \\system32 '#安装IEDriverServerdesc_py_path=python_path+ "\" +file_namedesc_sys_path=system_path+ "\" +file_nameShutil.copyfile (File_name,desc_py_path)Shutil.copyfile (File_name,desc_sys_path)Print ("Selenium plugin and driver already installed!!!" ")Install selenium plug-ins and

int Dma_map_device (struct device *dev,struct scatterlist *sg, int nents,enum dma_data_directiondirection); There can be a relatively simple way to pre-allocate buffers in a Linux system, which is to synchronize the "mem=" parameter to reserve memory. For example, for a system with a memory of 64MB, passing the MEM=62MB command-line argument to it allowsThe top 2MB memory is reserved for use as IO memory, this 2MB memory can be statically mapped, can also execute Ioremap ().As wi

1. Write Linux device driver, require engineers have a certain hardware foundation, know how SRAM, Flash, SDRAM, disk read and write,The interface of UART, I²c, USB and other devices, polling, interrupt, DMA principle, PCI bus working mode and CPU memory management MMU.2. Have a good C language Foundation, can flexibly use the structure, pointers, function pointers and memory dynamic application and release.3. Have a certain Linux kernel base, at least understand the interface between the driver

w764-bit flagship installation problem we must all have heard of it, and for Windows7 after the long-term use of various problems, you may not get the greatest degree of understanding, and due to the WINDOWS7 installation process defects, Making Windows7-driven problems appear in the process of gradual use. 1, the first thing to understand is what the Windows7 drive, these drivers are including graphics cards, sound cards, network cards, inclu

Small series has been introduced before, many of the computer's patch information, as well as services are automatically updated to download and install the system, which can help users save a lot of time, but also will make the system will never stand "imperfect" realm, but for some computers, Downloading some unnecessary program drivers will be a burden on the computer, become a CPU "do not poop" culprit, or cause the driver and computer incompatibi