Method for fast programming NAND flash and device thereof

Abstract

The invention relates to a memory programming method and a device thereof, in particular to a programming method for NAND flash and a device thereof. The invention adopts a manner in which a sub-disc copies a master-disc; namely, the programs on the master disc are directly transplanted to a sub-disc to realize fast programming of NAND flash; in particular, each programmed sub-disc can be used as a master disc; when NAND flash is programmed in large quantity, the adoption of multiple programming devices of the invention can increase the productivity in a geometric progression.

Description

technical field [0001] The invention belongs to a memory programming method and device, in particular to a NAND flash programming method and device. technical background [0002] NANDflash is more and more widely used in embedded systems, because NANDflas has the advantages of high capacity, high stability and fast read and write, so in the ARM9 era, NANDflash has become the mainstream medium, but because the embedded design has been involved The two major operating systems, linux and WINCE, make the whole file become huge, so when programming the file into NANDflash, it encounters a programming bottleneck. In the past, the programming of NANDflash is the first step of programming the bootloader with JTAG, so that the minimum system loads the bootloader and initializes each communication port (such as serial port, network card, etc.), and then downloads the linux kernel from the serial port to establish a file system, and then It is realized by downloading the linux applica...

AI Technical Summary

Problems solved by technology

As JTAG and serial port are serial input, they are also affected by the speed of their own related chips (the speed of MAX232 chip is much slower than that of NAND read and write), although the bootloader+linux kernel file is only 1 / 1 of the application content. 8. However, the total programming time is 8 times that of the application program, which makes the entire programming time of Nandflash extremely long; and before the bootloader is programmed, the serial port and the network port cannot communicate with the host computer. On the premise of not programming the linux kernel, although the network port can communicate with the host, the boot file of the entire system does not exist in the specified location due to the failure of the file system arrangement, resulting in the inability to start linux.

If you use multiple serial ports to communicate with the computer, it is a good choice on the surface, but a computer only has 2 serial ports. If you expand one serial port into multiple serial ports, it may cause errors in the feedback signal from the lower computer to the upper computer (possibly One lower computer is ready, but there is another one that has not been written, and the feedback to the upper computer is programmed), so this method will not work

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