A preliminary understanding of ARM_7075

ARM is the CPU, SDRAM is the memory, and NAND Flash and NOR Flash are the hard disk. Take Samsung 2440 as an example. NAND Flash is cheap and has a large capacity, so the bootleader can be placed in the first 4Kbytes of NAND Flash, and then ARM copies the code from the last 4Kbytes to the inside of 2440 for execution. These codes are to copy the operating system burned in NAND Flash to SDRAM for running. ARM Difficulty 1: Few register configurations, complex address space. ARM Difficulty 2: Naked running is the same as MCU, but the operating system is more difficult to run on ARM9. Linux, wince, uclinux, ucosii, Vxworks and other OS can be run. Bootleader is the top layer, which is similar to the computer's bios. After the bootleader completes the address mapping and hardware initialization, it will pass the power to the OS. If there is no OS, it is naked running. Launch the application on os . Just like a computer, bootleader includes vivi, uboot, etc. Uboot is commonly used, ads1.2 is used for compilation, and axd is used for debugging. The development environment of wince and linux is different, ucosii can also be started and written with ads1.2.

I listened quietly, unable to give this confused man a satisfactory answer. We walked out of the coffee shop, and when crossing the road, the man saw an opportunity and quickly ran to the other side of the traffic, waved to me and said, "Hurry up." I smiled helplessly.

Do simple things simply, do complex things simply, do simple things repeatedly, etc. These are all ways to ensure that your words will be effective.

When you first fall in love, you will be trapped by love. Women are emotional, and their behavior is often influenced by their feelings, especially girls who are just beginning to fall in love. Once they fall into the quagmire of emotions, they are often unable to extricate themselves. Therefore, when a girl faces the person she loves or is passionate about, the way she expresses her emotions can often make the other person clearly feel the strong and unrestrained love and passion.

Perhaps because he hadn't received a reply, he finally couldn't help but come to me, holding a thick stack of white paper, and said, "This time you don't have to use the excuse of not replying because you don't have manuscript paper."

Don't go shopping with men just because you want free porters

卼師垞http://blog.sina.com.cn/u/1769670432

Happiness is sitting in front of the computer at night wearing floral pajamas and writing articles, while my father is reading the newspaper in the living room with a cup of brewed Biluochun tea in front of him.

Frustration in love is also a kind of frustration, which can temper one's will and strengthen oneself.

Don't just please others

Everyone likes to hear "I love you". Although it is only three short words, it is very powerful. Love fills people with courage and hope.

Drastically reduces memory. This means that all those all-nighters in college are much less effective than you think.

Our expressions, postures, tones, and words when we quarrel are all seen and remembered by our children.