zephyr boards

routers Iii. design of hardware PCB diagramObjective: To reveal all the experience of PCB design through specific project cases, so that you can quickly become an excellent Hardware Engineer1) high-speed CPU board PCB design experience and essence;2) General PCB design highlights and highlights3) The essence of Motorola's PowerPC series PCB design4) The essence of Intel's PC motherboard PCB design5) Experience in PCB design for PC boards, industrial

: rpxlite (mpc8xx ),Smdk2410 (ARM920T ),Sc520_cdp (x86) and other directories CPU platform depends on storing CPU-related directory filesFor example: mpc8xx, ppc4xx,Arm720t, ARM920T, XScale, i386, and other directories The lib_ppc platform depends on files that are common to the PowerPC architecture,It is mainly used to implement functions common to the PowerPC platform. The lib_arm platform depends on files that are common to the ARM architecture,It is mainly used to implement general functions

Recently, some sites were found to be vulnerable to UBB Cross-site scripting attacks. Cross-site scripting attacks are rarely a significant impact on the server, but for a site, this vulnerability is too unworthy! Small, play point what dongdong come out, then change the homepage; Heavy theft of the user's cookies, even more will be g off the viewer's hard drive. A site is turned into a malicious website, who dares to come? If the station's webmaster more "blind" some, not a mess? 　　 A small p

advantage of this design concept is that it can help users Reduce network costs from the ports of each module. The disadvantage is that the port efficiency of network data is relatively low, all data exchanges depend on the data processing board capability of the core board. As the number of boards increases, the performance of the entire switch decreases, that is, the number of ports in the chassis is inversely proportional to the performance. In ad

of the circuit board. It defines the operating status of the circuit board or the position in the system, if the hardware note is set incorrectly, the circuit board may not work properly. 3) The circuit plate type is not suitable.After the hardware is updated, the circuit board with the same name may have multiple models. In general, the functions of the new model board are compatible with those of the old model board, but the functions of the old model board are not necessarily compatible with

to normal and the status is READE. 2) the circuit of the User Board port is damaged.After switching and plugging the user board, the corresponding port is still not recovered. You may suspect that the fault is caused. Adjust the two user boards. If the fault occurs with the Board, the corresponding port on the user board is damaged, and the switch user board is back to normal on the backend day. 3) User Board base or backboard faultAfter judging whet

Reduce network costs from the ports of each module. The disadvantage is that the port efficiency of network data is relatively low, all data exchanges depend on the data processing board capability of the core board. As the number of boards increases, the performance of the entire switch decreases, that is, the number of ports in the chassis is inversely proportional to the performance. In addition, the latest distributed switching architecture can b

The bucket that holds water is made up of many wooden boards, and the amount of water is determined by these boards. If one of the wooden boards is short, the amount of water in the barrel is limited by the short board. This short board has become a "limiting factor" (or "short board effect") for this bucket to hold water "). To increase the volume of water in th

anything. ponyprog200 and progisp may need to be set to make it better, for example, ponyprog uses the direct Io method faster than the API method, while progisp can customize its port pins. If it is different, set it to the same as the schematic. otherwise, it cannot be used.3. serial Port-based ISP download line ., because we are still using 51 to make some boards, when we first look at this circuit, we feel that because the reset is pulled on by d

The experiment environment needs to be changed to the Linux 2.6 kernel, but the Linux kernel installed on the arm2410s Development Board in the lab is 2.4, so you have to re-burn all the development boards to the kernel! As the kernel image and root file system change, you need to modify the flash partition, that is, modify the VIVI source code smdk. in the c file, mtd_partition_t default_mtd_partitions [], re-compile Vivi, and then burn Vivi to the D

C51 is almost the same. Next, let's look at the old tree'sArticleBeijing's college students have nothing to do with the development and look for the resistance, capacitance, transistor, chip, and connectors in the old tree's article, find out how the motherboard, Nic, sound card, and video card are drawn on your computer and find the feeling that these boards are a masterpiece of experts. Create a small product, follow the ideas in the old tree Ar

Apply global changes with masters Creating a dashboard is used to reuse resources and quickly apply them to wireframe. This section describes how to create, organize, edit, and use a dashboard.Video: Download MP4 format Masters Overview The dashboard is a set of widgets that can be reused in your files. It is usually used in headers, footers, navigation (navigation) and page templates.The greatness of the motherboard is that you can keep the motherboard in the same place on multip

performance is met, components must be neatly arranged and beautifully arranged to facilitate testing. The mechanical size of the Board and the position of the socket must also be carefully considered.The transmission delay time on the grounding and interconnectivity in high-speed systems is also the first factor to be considered during system design. The transmission time on the signal line has a great impact on the overall system speed, especially for the High-Speed ECL circuit, although the

Some time ago, I debugged the mcp2515 driver in Linux. The driver basically passed the debugging. Some problems occurred when I debugged several other boards in the past two days. 1. When Linux is started, probe mcp2515 sometimes fails, sometimes succeeds, and some boards can always be successful. When the probe fails, the message "mcp251x didn't enter in conf mode after reset" is displayed ". Debugging an

This article introduces in detail the concept of boot loader, which is based on the OS boot loader in the embedded system, The main tasks of software design and the structure framework. 1. Introduction Running GNU/Linux systems on dedicated embedded boards has become increasingly popular. An embedded Linux system can be divided into four levels from the software perspective: 1. boot the loader. Includes the Boot Code (optional) in the firmware and t

) project case: medium and low-end routersIii. design of hardware PCB diagramObjective: To reveal all the experience of PCB design through specific project cases, so that you can quickly become an excellent Hardware Engineer1) high-speed CPU board PCB design experience and essence;2) General PCB design highlights and highlights3) The essence of Motorola's PowerPC series PCB design4) The essence of Intel's PC motherboard PCB design5) Experience in PCB design for PC

All said look at the source before the first look at the readme, Prudential no I bully ah, before the new code to get the original confused can be good quality of the Readme, in order to achieve God clear eyes. A readme thousands of line of English explanation, translation is time-consuming and laborious, so I translate the pre-Readme part of the chapter, first throw a brick.====================================================## (C) Copyright 2000-2013# Wolfgang Denk, DENX software Engineering,

Question: 1372-Log Jumping the start position and length of n boards. Overlapping boards can jump to each other to obtain the maximum number of rings. Train of Thought: first sort by the starting position, and then judge whether he and the previous one can jump to each other with one more board each time. If yes, they can add more boards. Code: # Include #

would be a bit difficult if it was born from hardware.Q: Is the minimum system board good at Layer 2 or Layer 4?Answer: Only at91 can use two-layer boards, and the other can have at least four layers. The ground and power supply of 44b0 can also be well processed by Two-layer boards;Four-layer plates and 33 euro resistance:The selection of four layers is not only a problem of power supply and ground, the h

Socket 478 Intel recently plans to enable all Pentium 4 series processors to adopt the new socket478 package. This is due to the 0.13 micron process, and the Pentium 4 processor based on the Northwood core must use the socket478 package. By the fourth quarter of this year, the frequency of the series of processors will exceed 2 GHz. Under pressure from motherboard manufacturers, Intel is preparing to increase the output of the Willamette core socket478 processor. The reason is that the Northwo