code位于:drivers\base\Driver.c ,向bus中注册一个device_driver 1/**2* driver_register - register driver with bus3* @drv: driver to register4*5* We pass off most of the work to the bus_add_driver() call,6* since most of the things we have to do deal with the bus7* structures.8...
本章以ARM平台为例,结合kernel source code,从初始化以及cluster切换两个角度,介绍ARM big·Little driver的核心功能。 4.1 初始化 和ARM big·Little driver有关的初始化过程主要分为三个部分: 1)CPU core的枚举和初始化,具体可参考“Linux CPU core的电源管理(5)_cpu control及cpu hotplug”中有关possible CPU...
linux PCI driver code coolboy linux软件工程师 从事linux 驱动开源 来自专栏 · PCIe 1 人赞同了该文章 位于drivers/pci目录,PCI大部分代码都位于此,主要提供功能有:PCI控制器驱动,设备枚举,资源分配,PCI sysfs; 高级特性 热插拔,AER,DPC,EDR,PME等以及供PCI设备驱动调用PCI通用接口实现。 drivers/pci$ tree ...
在linux设备驱动device和device_driver,其中struct device结构会包含一个struct class指针(这从侧面说明了class是device的集合,甚至,class可以是device的driver)。当某个class driver向内核注册了一个class后,需要使用该class的device,通过把自身的class指针指向该class即可,剩下的事情,就由内核在注册device时处理了。 在d...
当前采用的WIFI是360随身WIFI,这款随身WIFI所用的网卡芯片是 Ralink(雷凌科技) 的解决方案(在上篇文章里也有详细介绍),芯片型号为 MT7601。 如果在PC计算机上使用这款随身WIFI那自然是简单,官网下载个驱动安装插上就能使用。 如果是在嵌入式平台,自动的平台上使用,官网就没有现成的驱动下载了,这种情况下就需要针对...
The full source code for this driver is less than 100 lines, but it is enough to illustrate how the linkage between a device node and driver code works, how the device class is created, allowing a device manager to create device nodes automatically when the driver is loaded, and how the...
File "/usr/lib/python2.7/site-packages/cloudinit/sources/DataSourceAzure.py", line 1316, in _get_metadata_from_imds except json.decoder.JSONDecodeError: AttributeError: 'module' object has no attribute 'JSONDecodeError' 原因:发生这种情况是因为 VM 标记具有非 ascii 字符,cloud-init 的版本早于 ...
Do not reuse and modify the existing NVIDIA Jetson AGX Orin Developer Kit code without first selecting and using your own board name. If you do not use your own board name, it will not be obvious to Jetson AGX Orin users whether the modified source code supports the...
shell$ diff <linux-source-tree>/arch/arm64/configs/xilinx_zynqmp_defconfig : +CONFIG_U_DMA_BUF=mInstallInstallation with the insmodLoad the u-dma-buf kernel driver using insmod. The size of a DMA buffer should be provided as an argument as follows. The device driver is created, and ...
Second, most driver code need not actually call access_ok. The memory-access routines described later take care of that for you. Nonetheless, we demonstrate its use so that you can see how it is done. The scull source exploits the bitfields in the ioctl number to check the arguments ...