Develop Linux device drivers pptx

... 2003/2004. Porting device drivers to the 2.6 kernel. This is a very valuable resource for porting drivers to the new 2.6 Linux kernel and also for learning about Linux device drivers. B. Zoller. ... software. 2. Take any device that doesn’t work on Linux, but has a very similar chipset to another device which does have a proven device driver for Linux. Try to modify th...

Ngày tải lên: 03/07/2014, 16:21

... implementations. For example, the video-for -linux set of drivers is split into a generic module that exports symbols used by lower- level device drivers for specific hardware. According to your ... new device, it will be able to avoid probing those ports that are already in use by other drivers. ISA probing is in fact a risky task, and several drivers distributed with the offic...

Ngày tải lên: 24/12/2013, 01:17

... /proc is heavily used in the Linux system. Many utilities on a modern Linux distribution, such as ps, top, and uptime, get their information from /proc. Some device drivers also export information ... } exit(0); } setconsole uses the special ioctl command TIOCLINUX, which implements Linux- specific functions. To use TIOCLINUX, you pass it an argument that is a pointer to a...

Ngày tải lên: 24/12/2013, 01:17

... historical reasons: when Unix developers faced the problem of controlling I/O operations, they decided that files and devices were different. At the time, the only devices with ioctl implementations ... implementing device control this way is that the user can control the device just by writing data, without needing to use (or sometimes write) programs built just for configuring the...

Ngày tải lên: 24/12/2013, 01:17

... gettime: 846157215.942465 xtime: 846157215.941188 jiffies: 1308095 Delaying Execution Device drivers often need to delay the execution of a particular piece of code for a period of time ... according to the value of HZ, which is an architecture-dependent value defined in < ;linux/ param.h>. Current Linux versions define HZ to be 100 for most platforms, but some platforms...

Ngày tải lên: 24/12/2013, 01:17

... Mapping a device means associating a range of user-space addresses to device memory. Whenever the program reads or writes in the assigned address range, it is actually accessing the device. In ... multiple of the page size. These limits are not a big constraint for drivers, because the program accessing the device is device dependent anyway. It needs to know how to make sense of...

Ngày tải lên: 21/01/2014, 07:20

... 1 :An Introduction to Device Drivers As the popularity of the Linux system continues to grow, the interest in writing Linux device drivers steadily increases. Most of Linux is independent ... independent of the devices attached to the SCSI cable. Other classes of device drivers have been added to the kernel in recent times, including USB drivers, FireWire drivers, an...

Ngày tải lên: 24/12/2013, 01:17

... of setting up the devices. for (i=0; i < scull_nr_devs; i++) { scull_devices[i].quantum = scull_quantum; scull_devices[i].qset = scull_qset; sema_init(&scull_devices[i].sem, 1); ... Allocation of Major Numbers Some major device numbers are statically assigned to the most common devices. A list of those devices can be found in Documentation/devices.txt within the kernel s...

Ngày tải lên: 24/12/2013, 01:17

... cache. Device drivers normally do not exhibit the sort of memory behavior that justifies using a lookaside cache, but there can be exceptions; the USB and ISDN drivers in Linux 2.4 use caches. Linux ... GFP_KERNEL and GFP_ATOMIC, although those two cover most of the needs of device drivers. All the flags are defined in < ;linux/ mm.h>: individual flags are prefixed with...

Ngày tải lên: 24/12/2013, 01:17

... ports are: #include < ;linux/ ioport.h> can be either hardwired in the device or assigned by system firmware at boot time. The former is true, for example, of ISA devices, whose addresses ... addresses are either burned in device logic circuits, statically assigned in local device memory, or set by means of physical jumpers. The latter is true of PCI devices, whose addresses...

Ngày tải lên: 24/12/2013, 01:17