Q&a about Linux

Sorry, personal logical thinking is not very good, the following try to use the image analogy to explain, popular but not necessarily accurate. The exact description or the document is to be flipped.

Q1: What is the purpose of the cross compiler?
A1: Just as people who speak two different languages need to have a translator to communicate, the cross compiler is the equivalent of translation. Well, it's not exactly like that. The final result of the compiler is still to be used by the package chip partners, so whether it is running on win or on ARM, Linux is a binary file. But these binaries are not generic, because we have different architectures. Like all compressed files, different formats are handled by different decoders. With this, you can write a C program under the win system, and then cross-compile it into the required binaries and then download it to the embedded hardware for execution.

Q2: How to learn embedded systems?
A2: Read a lot of information and experience summary, learning Embedded systems and computer software design, because the learning object is powerful, the beginning of the school can not be like learning other technologies, everywhere. In all things ask the end, learn to be more suitable for research-oriented, academic applications, if it is to develop products suitable for the market needs, the competent post work should pay more attention to how to use the existing technology, common functions to achieve system integration, in the process of system iteration targeted to a certain aspect in-depth study in order to obtain continuous improvement. Do not expect to be able to make perfect system at once, rapid prototyping, focus on iteration to adapt to the trend of the times.

What is q3:fastboot used for?
A3: Using USB OTG to connect computer host and embedded hardware, on the computer side by opening the CMD console, input the relevant instructions to achieve the download of Uboot, kernel and file system (Burn/brush/write). Before downloading, put the files that need to be downloaded into the folder where the FastBoot is located.

What is Q4:EMMC?
A4: A high-speed, low-power memory for mobile portable devices. E is embedded, born for embedded! Detailed description see Baidu or Samsung product description, remember eMMC storage unit is block (block), 1 block=512 byte. Note the claim type when formatting: MMC.

Q&a about Linux