3ddr ram

The principle of caching is that when the CPU needs to read a piece of data, it first looks up from the cache and immediately reads it and sends it to the CPU for processing;If not found, it reads data from the memory at a relatively slow speed and sends it to the CPU for processing. At the same time, it transfers the data block of the data to the cache, this allows you to read the entire block of data from the cache without calling the memory.This reading mechanism makes the CPU read cache hit

Bib is fully called binary image builder. bib files are used in the final makeimage stage of the wince compilation process. The function of bib files is to instruct the system to build a binary image. All the bibfiles will be merged into the ce.bibfile. Then, the packaging tool romimage.exe will decide which files will be included in the wince image according to the description in the bib file. The bib file also determines the memory allocation of the wince device, for example, which memory the

product of EEPROM. Its biggest feature is that it must be erased by block (the size of each block is not fixed, and products of different manufacturers have different specifications ), the EEPROM can only erase one byte at a time ). Currently, "Flash Memory" is widely used on the motherboard of a PC to save BIOS programs and facilitate program upgrade. Another major application area of Ram is used as a replacement for hard disks. It has the advantage

reserved = System memory +hbase memory.You can refer to the following table to determine the memory that should be retained: memory per machine memory required by the system the memory required by HBase 4GB 1GB 1GB 8GB 2GB 1GB 16GB 2GB 2GB 24GB 4GB 4GB 48GB 6GB 8GB 64GB 8GB 8GB 72GB 8GB 8G

0ElseEcho $ userFiUPtime = '/usr/bin/uptime | awk {print $3 "" $4 "" $5 }'Echo $ UPtimeHostnameRun the following script:Chmod + 755/opt/mrtg. wwwModify/etc/mrtg. cfg and add the www project to the end of the file.Target [www]: '/opt/mrtg. www'MaxBytes [www]: 500Options [www]: nopercent, growrightYLegend [www]: Online UsersShortLegend [www]: %LegendI [www]: Connect:LegendO [www]: Online:Title [www]: WWW ConnectPageTop [www]: Regenerate the index page:Indexmaker/etc/mrtg. cfg>/var/www/mrtg/index.

output is the way to achieve (for the selection of components to do reference)3) Whether the system needs the operation interface (involving the software layer operating system selection)In fact, for small embedded products, the definition of requirements is very critical, because the requirements are clear, you can avoid the subsequent development process, such as random memory (RAM) capacity is insufficient or the selected CPU speed does not meet t

is a two-dimensional array [don't tangle, in order to make it easier for me to convert it to JSON], where type has only two values of 1 and 2,Now you need to move the type=1 element into the $new array, type=2 to the $old array. Is there any way besides using the loop? Attach JSON: [{"id": "Ten", "Type": "1", "CPU": "Intel Xeon e3-1241v3", "Cores": "4", "Ram": "+", "hard_drive": "1TB SATA", "Port_speed": " 100Mbps "," Transfer ":" 20TB "," IPMI_KVM ":

Bootloader and Linux kernel. If you have a clear understanding of the bootloader Execution Process and the Linux Startup Process, it will help you to clarify the work required in the development process and thus accelerate the development process of the embedded system. This is exactly what we will study in this article.2. bootloader2.1 concepts and functions of bootloaderBootloader is the boot loader of an embedded system. It is the first program that runs after the system is powered on. It ac

In any Microsoft Windows CE-based device, Rom stores the entire operating system (OS), as well as the applications that come with the OS design. If a module is not compressed, the OS executes the ROM-based modules in place. if the OS compresses a ROM-based module, it decompresses the module and pages it into RAM. the OS loads all read/write data into RAM. the OEM controls the option to enable compression in

unknown ~ . = .;_ U_boot_1__start = .; // Save the address value recorded in the current address counter to _ u_boot_cmd_start. In the second stage of the Code, this segment is used to save the uboot command. With this symbol, you can find this segment //Location. U_boot_cmd: {* (. u_boot_cmd)} Put the u_boot_cmd segments of all input files here. * Is a wildcard, indicating each file_ U_boot_1__end = .; . = Align (4 );_ Bss_start =.; // record the loading address of the BSS segment. BSS :{*(. B

get the transplanted uC/OS-II?In UCOS, OS _enter_critical () and OS _exit_critical () Enable IRQ interruption (). (6) Project-> edit configuration; click New, and add "Debug in Ram" and "Debug in flash" configuration targets in the name column, you can also remove release and debug from deployments. Then OK. (7) In the workspace drop-down list, select debug in Ram, right-click the project name maid, right

use MongoDB as a pure memory database (Redis style) Basic Ideas The use of MongoDB as a memory database (In-memory db), which is not allowing MongoDB to save data to disk, has aroused more and more people's interest. This usage is very practical for the following applications: write-intensive cache embedded systems that precede a slow RDBMS system require a lightweight database and a unit test that data in the library can easily be purged without the need for a persistent data-compliant PCI sy

January 2013 Switch-case the difference between Java and C # (author-Ram Day more wonderful posts) Some of the attributes of a string (author-finger-bombs more wonderful posts) Common methods for strings (author-finger bombs more wonderful posts) Value types and reference types (author-finger bombs more wonderful posts) Dictionary simple application-traditional characters conversion (author-finger bombs more wonderful posts) Powerful Indexer (author-s

This method is extremely useful for the following applications: Write-intensive high-speed cache placed before a slow RDBMS System Embedded System PCI compatible systems without persistent data Unit testing, which requires a lightweight database and can easily clear data in the database) If all this can be achieved, it is really elegant: We can skillfully use the MongoDB query/retrieval function without involving disk operations. You may also know that in 99% cases, disk I/O, especially random I

Bib file parsing for winceBib is called binary image Builder, bib files are used in the final makeimage phase of the wince compilation process, and the purpose of the bib file is to instruct the build system how to build a binary image. All bib files are merged into a ce.bib file, and the package tool Romimage.exe determines which files are eventually included in the wince image based on the descriptions in the bib file, and the bib file also determines the allocation of wince device memory, suc

recommended for O m vpn, which can be Site To Site or dialing. If a large number of O M personnel work in a fixed office location, they can use the Site to Site mode to establish a persistent connection encrypted channel from the O M office location to the public cloud, the CIDR block of the security management group on the public cloud is equivalent to an extension of the local O M network. If the O M personnel are few and often move to the office, you can use the dial-up VPN mode. When t

IntroductionOPS colleagues often encounter these four questions: How does Nova count OpenStack computing resources? Why FREE_RAM_MB, FREE_DISK_GB will be negative? Even if FREE_RAM_MB, FREE_DISK_GB is negative, why is the virtual machine still able to create success? The use of random scheduling due to insufficient resources will cause the virtual machine to fail, while the specified host can be created successfully? This article will start with the above four questions

The implementation under multi Bin's wince 5.0 and smdk2440 was about to be released earlier, but I saw that king_sundi had posted a post, so I hesitated to send it. Relatively speaking, my summary is more practical. Basically, it will be successful by following this step. I have tried it for some of my friends and they will be able to solve this problem at first. Summary of xip implementation. Step 1: Modify the config. bib file. The size of the kernel subset xipkernel is adjusted according to

Linux Driver Development III (the memory of hardware knowledge that must be understood) This article focuses on the basic knowledge of memory, the network on the Ram,rom,flash, etc. have a very detailed introduction, Lao Xie will these knowledge points summarized and annotated as follows. This process of finishing is also a process of deepening memory.1. What is MemoryIn the structure of the computer, there is a very important part, is the memory.

Basic ideas The use of MongoDB as a memory database (In-memory db), which is not allowing MongoDB to save data to disk, has aroused more and more people's interest. This usage is very useful for the following applications: Write-intensive caching before a slow RDBMS system Embedded system PCI compatible systems without persistent data Unit tests that require a lightweight database and that data in the library can be easily cleared away (testing) If all this could be done, i