pci ramdisk

Due to the use of the RAMDisk file system, the IP tool version is too old to configure can, you need to self-compile IP, see reference 21.vivado Configuration PS2. The device tree adds Can0, and the General Development Board has provided this configuration[Email protected] {compatible = "xlnx,zynq-can-1.0"; status = "Okay"; clocks = 3.kernel configuration, generally well-equipped, see reference 14. Testing#ifconfig-acan0 Link encap:unspec HWaddrxx-xx

Sometimes you want to do something after startup, such as creating directories on sdcard and modifying/Data Access Permissions, which can be put in init. how can I do this in RC? recently, due to the need of my work, I have made some research in this area for your reference. The following example shows how to implement a function: After the Android system is started, modify the/data access permission to 770. 4 steps in total: 1. Decompress ramdisk. IM

[From Baidu encyclopedia] Memory Virtual Disk (ramdisk) refers to the use of software technology to split the physical memory, part of the memory is converted into a hard disk through virtual technology to greatly improve the speed of reading computer data and protect the hard disk. [Technical advantages] 1. for computer systems, the read speed of the memory is about 20 times that of the hard disk. Using the memory virtual hard disk can quickly and ef

Ramdisk root file system + initramfs started the ramdisk root file experiment these days. Test environment: Ubuntu 12.04 first I think it is better to create the root file system, because one of the configuration kernels is related to the ramdisk size you have created. Here I directly use the original root file system. 1. create a

If you are free these days, simply sort out the PCI items. For PCI, the "PCI things" of fudan_abc hero is the best. Here we will make some preparations based on some work notes and take a look at the general framework for memo. 0, Background 1. PCI driver structure 2. PCI dr

1,kernel configuration, setting RAMDisk size[[Emailprotected]~]#cat/etc/grub.conf#grub.confgeneratedby anaconda##Notethatyoudonothavetorerungrub aftermakingchangestothisfile#notice:youhavea /bootpartition.thismeansthat# allkernelandinitrdpathsarerelativeto/boot/, eg.#root (hd0,0) # kernel/vmlinuz-versionroroot=/dev/vda6# initrd/initrd-[generic-]version.img#boot=/dev/vdadefault =0timeout=5splashimage= (hd0,0)/grub/splash.xpm.gzhiddenmenutitlecentos (2.

}/.. /.. /out # modules install pathramdisk_dir = ramdiskinstall_mod_path =$ {out_dir}/tmp/$ {ramdisk_dir} # echo "make kernel? (Y, n )"; read make_kernelecho "*****************************" Echo "* Make kernel * "Echo" ****************************** "If [" $ make_kernel" X = "N" X]; thenecho "*** skip ***" elsemake-j4make uimage-j4cp ARCH/ARM/boot/uimage $ {out_dir} fiecho "*********** * ***************** "Echo" * install modules * "Echo "*********** * ****************** "CD $ {out_dir} [-e" t

First download the android source code and compile it. There are a lot of online materials. You can refer to this:Http://www.bkjia.com/kf/201202/118141.htmlFollow the steps above to compile the android kernel successfully. If no accident occurs, three files will be generated in the out/target/product/generic Directory, which are ramdisk. img, sytem. img, userdata. img. What are the purposes of these three files? Next, let's analyze it.First, run the f

Reference to the original network: http://blog.csdn.net/zhouxinfengone/article/details/7738698 Http://hi.baidu.com/deep_pro/blog/item/220df2dddac6e3d28d1029dd.html In the essential Linux.device drivers saw such a remarkDuring the development of embedded systems, INITRD and INITRAMFS can sometimes be used as the actual root file system on embedded devices. To see such a sentence is very confusing to me, because it seems I understand that to do this can improve a bit of embedded Linux startup sp

As described in "How to Improve the Performance of vmware5", by setting the virtual memory file to shut down VMWare, VMWare can truly run in physical memory. I installed the client Windows XP in VMware, by setting off the virtual memory of Windows XP, all programs can run in the physical memory, which greatly improves the speed. However, during the test, it is found that the access speed of the Virtual Machine hard disk gradually becomes a bottleneck and the speed cannot be further improved. Wha

People with Firefox may Envy Chrome's speed, but they're not willing to discard Firefox. The acceleration of Firefox may be extended by a series of methods, such as with Fasterfox. But the use of virtual memory disk Ramdisk, will be part of the memory of virtual hard disk space, for the Firefox cache use, would greatly reduce the disk read and write, speed up Firefox. We all know that disk read and write speed is certainly much slower than the speed o

Tags: Mpc8313erdb not fresh pkg package, put the file in RAMDisk Generated Rootfs.ext2.gz.uboot by the Ltib compiler it can be used directly uboot. Let's say we've written the appropriate external file to move the RAMDisk in. You can create a pkg package. Then configure the compilation (,. ，）。 Of course, such a method is more troublesome. Then there is a simpler way, do not need to create a new pkg will

1. ramdisk. the imgfile gzip is compressed, so use the gunzip command to decompress it. but gunzip extension .gz can be decompressed normally, otherwise it will be ignored. (source file type) ramdisk. img: gzip compressed data, from Unix 2. after the name is removed, the suffix .gz is automatically removed and renamed as ramdisk. img. The file type is

Ubuntu has its own ramdisk function and does not need to install any software. By default, UBUNTU uses half of the memory as ramdisk space. (The mount point is/dev/SHM and the file type is tmpfs) /Dev/SHM is not entirely ramdisk. If it uses more than half of the computer's Ram, it will start to eat swap. In addition, the unused parts are automatically released f

The PCI-X interface is an updated version of the connected PCI Bus (peripheral components Interconnect), still using traditional bus technology, but there are more wiring pins, at the same time, all connected devices share all available bandwidths, as described above. 1 What is the PCI-X and the original PCI interface

1. The bus is composed of an electrical interface and a programming interface. Kernel functions used to access peripherals of Peripheral Component Interconnect (PCI, peripheral device interconnection,Because PCI bus is widely used on desktops and peripherals on larger computers today, and bus is the best supported bus in the kernel, ISA bus is basicallyIt is a "bare metal" type bus.2. Three main objectives

A related technology and research In 1997, PCI SIG developed the first PCI hot-Plug specification, which defines the platforms, boards, and software elements necessary to support hot-swappable. PCI SIG introduces the standard hot-swappable controller specification (SHPC spec), which clearly provides hot-swappable standard usage patterns and stringent register gr

Ramdisk is an old technology that virtualizes a block of memory into a hard disk. The feature is that the speed is so fast that everything is lost after the restart. The main purpose of using it is to store various temporary files of my own. For example, if I download something from the Internet, I may first go down to the memory disk and take a look at it, there is no need to write it to the hard disk. Of course, netizens also have various usag

Now the memory is cheap, many users have configured more than 8GB memory, this time RamDisk use is very useful, there are a lot of this kind of software, more useful RamDisk software I recommend is Primo RamDisk, specific Baidu know.After using RAMDisk, you can move the various temporary files to the virtual disk, the

1. modify an existing File SystemSet the file system compressed file to ramdisk.gz.1. Extract# Cd ramdisk.gz directory# Gunzip ramdisk.gzAfter decompression, obtain the file system image file ramdisk, which overwrites the original compressed file.2. Image File MountingThe image file must be mounted to view the directories and details in the file system.# Mkdir/mnt/loop/*/mnt/loop is the directory to which the file system is mounted.# Mount-o loop