设备树在嵌入式硬件描述中的应用

Device
tree
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"这篇文档是关于在嵌入式系统中使用Device Tree的介绍，摘自2008年Linux Symposium的会议论文集，由多个来自Linux社区和公司的专家参与组织和审阅。主要内容由Grant Likely和Josh Boyer撰写，探讨了在32位和64位PowerPC支持合并的过程中，如何通过Device Tree来标准化固件接口。" 在嵌入式系统中，Device Tree是一种关键的技术，用于在操作系统和硬件之间提供一种抽象层，描述系统的硬件结构。它以一种结构化的数据格式存储在固件中，通常是一个二进制blob，被内核加载并解析，以便在启动时配置和初始化硬件。Device Tree的主要优点在于其可移植性和灵活性，使得内核能够适应各种不同的硬件平台，而无需硬编码具体的硬件细节。 Device Tree的组成部分主要包括节点（nodes）和属性（properties）。节点代表设备、总线、中断控制器等硬件组件，它们通过树状结构相互连接。属性则包含关于硬件的具体信息，如地址空间、中断号、设备类型等。这样的设计使得驱动程序可以动态地根据Device Tree中的信息来识别和配置硬件，减少了对特定硬件的依赖。 在32位和64位PowerPC的支持合并过程中，引入Device Tree作为固件接口的标准化方法，是因为它能够有效地解决不同架构间的差异问题，同时提供了向后兼容性和扩展性。通过Device Tree，固件可以为不同架构的内核提供一致的描述，简化了内核的开发和维护工作。 文档可能涵盖了以下主题： 1. Device Tree的基本概念和结构。 2. 如何编写和编译Device Tree源文件（DTS）。 3. Device Tree在内核启动过程中的作用，包括解析和绑定到驱动程序的过程。 4. PowerPC架构中Device Tree的实现和与固件的交互。 5. 设备驱动程序如何利用Device Tree信息来初始化和操作硬件。 6. 实际案例分析，展示如何使用Device Tree描述和控制嵌入式硬件组件。 7. 设计和实现Device Tree的最佳实践。 通过阅读这篇文档，读者将能够深入理解Device Tree的工作原理，以及如何在实际项目中应用这一技术来提高嵌入式系统的灵活性和可维护性。对于从事嵌入式Linux开发的工程师来说，掌握Device Tree的知识是必不可少的，因为它已经成为现代嵌入式系统设计的标准部分。

写作How to describe a person.pptx

2021-10-07 上传
写作How to describe a person.pptx

Give me an IELTS answer in English. The question was to describe a traffic jam in 300 words.

2023-02-06 上传
在我的城市，交通堵塞是很常见的现象。特别是在上下班高峰期，道路上总是塞满了汽车，以至于几乎无法移动。 通常情况下，交通堵塞的原因是道路太窄，无法容纳大量车辆。另外，城市拥有众多的公交车、出租车和私家车...

Describe the approach to addressing HTML elements using getElementById.

2023-05-24 上传
In JavaScript, the `getElementById` method is used to obtain a reference to an HTML element using its `id` attribute value. The method searches the entire document for the specified element and ...

Describe the approach to addressing HTML elements using name attributes.

2023-05-24 上传
To address HTML elements using name attributes, you can use the getElementByName() method in JavaScript. This method takes the value of the name attribute as an argument and returns an array of all ...

What is the block tag in Javadoc to describe the method return value?

2023-02-07 上传
* @param a the first integer to add * @param b the second integer to add * @return the result of adding a and b */ public int add(int a, int b) { return a + b; } ``` 在这个示例中，`@return` 标记...

Assembling the following assembly program first by hand and then verify your result using the assembler. Write a report describe the assembling process. Your report file should include the symbol table and the machine code in binary for the assembly code and other related information to describe the assembling process. 01 ; 02 ; Program to multiply an integer by the constant 6. 03； Before execution, an integer must be stored in NUMBER . 04； 05 . ORIG x3050 06 LD Rl,SIX LD R2 , NUMBER 08 AND R3,R3,#0 ; Clear R3. It will 09 ; contain the product . 0A ; The inner loop 0B； 0C AGAIN ADD R3,R3,R2 0D ADD R1,R1,#-1 ; R1 keeps track of 0E BRp AGAIN ; the iterations 0F ； 10 HALT 11. ; 12 NUMBER . BLKW 1 13 SIX . FILL x0006 14； 15 . END

2023-05-23 上传
首先，我们需要对代码进行手动汇编，以了解汇编过程。在手动汇编过程中，我们需要创建一个符号表来跟踪每个标签和地址之间的关系。符号表如下所示： | 符号 | 地址 | |------|------| | SIX | x3060 | ...

describe the difference between parallelism and concurrency in embedded system

2023-05-22 上传
In summary, parallelism refers to the simultaneous execution of multiple tasks, while concurrency refers to the ability of multiple tasks to make progress at the same time. Both concepts are important...

Please write a simply code in python, the requirement is as followed: 1. use the list type describe rod A, B and C 2. to The Tower of Hanoi is a mathematical game or puzzle. It consists of three rods, and a number of disks of different sizes which can slide onto any rod. The puzzle starts with the disks in a neat stack in ascending order of size on one rod, the smallest at the top, thus making a conical shape. The following figure shows the initial state of the Tower of Hanoi with 5 disks.The objective of the puzzle is to move the entire stack to another rod, obeying the following simple rules: 1. Only one disk can be moved at a time. 2. Each move consists of taking the upper disk from one of the stacks and placing it on top of another stack i.e. a disk can only be moved if it is the uppermost disk on a stack. 3. No disk may be placed on top of a smaller disk. Assume that initially all the disks are placed on rod A. Write a non-recursive Python function to print out the steps to move all the disks from rod A to rod C via rod B (Hint: a recursive algorithm can be converted into a non-recursive algorithm using stack). The header of the function is: def HanoiTower(n) Here n represents the number of disks.

2023-02-06 上传
print(f'Move disk from rod {from_rod} to rod {to_rod}') else: stack.append((n-1, aux_rod, from_rod, to_rod)) stack.append((1, from_rod, aux_rod, to_rod)) stack.append((n-1, to_rod, aux_rod, from_...

Maximum Subarray Problem (16 points) Maximum Subarray Problem means to find the subarray indexed from i to j which maximize the sum of Ai ~Aj . You should notice that there may be negative ones but not all in the input array A[1..n]. (1) Give an algorithm to calculate the maximum subarray in O(n2 ) time, using Brute-Force or Divide and Conquer strategy as you like. (2) How to solve the problem in O(n) time using Dynamic Programming strategy? Give and describe the recursive equation used in the optimal substructure of the DP algorithm. (3) Given the following input array as following, used the algorithm in step (2) to calculate the maximum subarray. 8 -5 -4 10 -1 7 -3 12 -20 18

2023-06-13 上传
1. Brute-Force or Divide and Conquer strategy: Brute-Force: 对于每一个子数组，计算其和，然后比较得出最大子数组。时间复杂度为O(n^2)。 Divide and Conquer: 将数组分成左右两部分，最大子数组要么在左边，...

You could also create code to simulate the Monty Hall problem. Create a function named random_door, which uses numpy.random.choice to sample 1 door randomly from a list of integer door indices (1-3 in this case). Use this function to randomly select the door the car is behind and the contestant’s initial choice of doors. Create a function monty_choice, which chooses the door Monty opens, conditional on the contestant’s choice of doors and the door with the car. For the case where the contestant has selected the door with the car, select the door to open by simulating the flip of a fair coin using the np.random.binomial function with n = 1. Create a function win_car, which determines if the contestant wins the car, conditional on the strategy selected, {switch, noswitch}, the door the contestant selected, the door with the car, and the door Monty opened. Create a function named simulation that allows you to run the simulation n = 1000 times, with a switch or noswitch strategy. Execute your simulation for each possible strategy. For the two strategies, plot side by side bar charts showing the numbers of successes and failures for each strategy. Describe the strategy a contestant should adopt for this game. How much will the chosen strategy change the probability of winning a car? Is this result consistent with the conditional probability of this problem?

2023-06-09 上传
This code defines three functions: `random_door` to randomly select a door for the car or the contestant, `monty_choice` to choose the door Monty opens based on the contestant's choice and the ...
my_mooncity
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