linux kernel driver tutorial

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

; MTD=get_mtd_device_nm (name); if(Is_err (MTD))return(int) MTD;#ifLinux_version_code >= kernel_version (3,3,0)ret= Mtd_read (MTD, from, Len, Rdlen, buf);#elseret= Mtd->read (MTD, from, Len, Rdlen, buf);#endif if(Rdlen! =len) PRINTK ("Warning:ra_mtd_read_nm:rdlen isn't equal to len\n"); Put_mtd_device (MTD); returnret;} Export_symbol (RA_MTD_WRITE_NM); Export_symbol (RA_MTD_READ_NM); Export_symbol (Procregdir); Module_author ("Steven Liu "); Module_description ("Ralink Apsoc Flash Map"); M

Registers and memoryWhat is the difference between registers and memory?The main difference between registers and RAM is that the register operation has side effects (side effect or marginal effects):Reading an address can cause the content to change, such as the interrupt status register for many devices is automatically zeroed out as soon as it is read.Memory and IOIn the X86 processor has the concept of IO space, IO space is relative memory space, they are independent of each other's address

Linux Driver Tutorials : Http://pan.baidu.com/s/1c0hljUSWrite a simple application call driver--header file? Print header File–include ? The header file needed to invoke the file in the app– #include The environment is maintained as a 32-bit value and grows to a 64-bit value in the 64 compilation environment.– #include Tao, socket, character, block properties– #i

the folder that corresponds to the/usr/src/kernels of your Linux hostOBJ-M:=HELLO.O target file Dependent hello.oStart writing code:/*hello_module.c*/#include#include#includeModule_license ("Dual BSD/GPL");Static intHello_init (void) {PRINTK (Kern_emerg"Hello, Linux driver!\n"); return 0; }Static voidHello_exit (void) {PRINTK (Kern_emerg"Hello Diver Exit!\n"); }

MT7620Modify Trunk/build_dir/target-mipsel_24kec+dsp_uclibc-0.9.33.2/linux-ramips_mt7620a/mt7620/rt2880/os/linux/rt_ linux.c:1201 LineWill:　　Posfsinfo->fsuid = Current_fsuid ();Posfsinfo->fsgid = Current_fsgid ();Modified to:Posfsinfo->fsuid = * (int *) current_fsuid ();Posfsinfo->fsgid = * (int *) current_fsgid ();mt7610e7610E drive to be modified in 2 locations1. Modify Trunk/build_dir/target-mipsel_24kec

using third-party sources, useyum listThe command cannot find the driver related to Nvidia, and then add the rpmfusion source, such: Use againyum listSearch for the Nvidia driver and obtain the following results: Finally, useyum install akmod-nvidiaInstall it. Here we will talk about akmod. As mentioned above, for the kernel module, the

Embedded Linux Driver Development tutorial (kernel driver, watchdog technology, touch screen, video capture system)Suitable for people: advancedNumber of lessons: 109 hoursUsing the technology: embedded LinuxProjects involved: Driver