WO2018040924A1

WO2018040924A1 - Write method and write system utilized in nand flash production

Info

Publication number: WO2018040924A1
Application number: PCT/CN2017/097818
Authority: WO
Inventors: 吴旋
Original assignee: 福建联迪商用设备有限公司
Priority date: 2016-08-31
Filing date: 2017-08-17
Publication date: 2018-03-08
Also published as: CN106339246A

Abstract

The invention relates to the field of personal computers (PC), and specifically, to a write method and a write system utilized in a NAND flash production stage. The write method comprises the following steps: S1: a PC terminal data write program transmits, to a NAND flash of the terminal, a terminal write program; S2: the terminal write program detects bad block locations in the NAND flash, and transmits, to the PC terminal write program, the bad block locations; S3: the PC terminal write program computes, according to the received bad block locations and a preconfigured first partition table, an actual used size of each of partitions, so as to generate a second partition table of the partitions, wherein the first partition table includes an actual required size of each of the partitions; and S4: the PC terminal write program writes, to the NAND flash of the terminal, and according to the second partition table, an image file of each of the partitions. The embodiments ensure production quality and increase a utilization rate of storage space, keeping costs in control.

Description

A programming method for NANDFLASH production stage and its burning system

Technical field

[0001] The present invention relates to the field of PCs, and in particular, to a method for programming a NANDFLASH production stage and a programming system thereof.

Background technique

[0002] Because NANDFLASH has the advantages of large capacity, low cost, and fast rewriting speed, it has been gradually used in embedded devices such as payment terminals, car navigation, industrial control devices, and set-top boxes, replacing the status of original N ORFLASH and other storage devices. .

[0003] Most embedded devices need to divide FLASH into different areas to achieve different functions. Common partitions include Uboot partition, Linux kernel partition, LOGO partition, system configuration partition, and so on. In the production phase, most partitions need to be written to different images in advance, and after writing, they need to be written according to the partition table. The partition table describes the distribution of each area on the FLASH, including the starting address, size, and so on.

[0004] At present, in the production of burn-in, a fixed partition table is used, and the actual size of each partition is specified. For NANDFLASH, there is a problem with this approach. The process of the NANDFLASH chip determines that there are a certain number of bad blocks; for each NANDFLASH, the number and distribution of bad blocks are different. In this way, if a fixed partition table is used, there is a problem that the effective area becomes smaller because there are too many bad blocks in the area where a partition is located, and the complete image cannot be burned; thus, some terminals cannot be used normally. If these partitions reserve more areas, there will be wasted areas, which will reduce the utilization of FLASH space, and even lead to the forced use of larger capacity FLASH, resulting in increased costs.

[0005] Chinese Patent Application No. CN201210157878.7 discloses a bad block management method for flash storage, which divides a memory space into a first area and a second area, and maps bad blocks in the first area to the first A normal block in the two regions, and the BBT recording such a mapping relationship is stored in the block of the second region. The method saves the mapping relationship by using multiple bad block tables to avoid the loss of the mapping relationship due to the block damage of the bad block table. However, there is a problem with the bad block management method of the patent, since the bad block table and the data are stored in the block of the second area, if the flag bit is used to distinguish whether the block stores the bad block table or the data, After each access to the NAND flash device, it is necessary to traverse the entire second region to find the bad block table, thereby reducing the access efficiency. If the specific space is divided in the second region to save the bad block table, the number of traversed blocks can be reduced. , but the blocks in a specific space can only be used to save bad block tables, can not be used to store data, and waste storage space.

technical problem

[0006] The technical problem to be solved by the present invention is: Providing a programming method for a NANDFLASH production stage and a programming system thereof, solving a bad block generated by a NANDFLASH in a production stage, causing a bad block concentration in a certain partition, an effective area The problem of not being able to burn into a full image, and the need to reserve more areas in the partition, result in low space utilization and rising costs.

Problem solution

Technical solution

[0007] In order to solve the above technical problem, the technical solution adopted by the present invention is: Providing a method for NANDFLA

The method of programming in the SH production stage includes the following steps:

[0008] SI: the PC-side burning program sends the terminal burning program to the NANDFLASH of the terminal;

[0009] S2: the terminal burning program detects a bad block distribution in the NANDFLASH, and sends the bad block distribution to

PC end burning program;

[0010] S3: the PC-side burning program according to the received bad block distribution and the preset first partition table, the first partition table describes the size of the area that each partition actually needs to use; Area size

, thereby generating a second partition table for this partition;

[0011] S4: The PC-side burning program sequentially writes a mirror of each partition in the NANDFLASH of the terminal according to the second partition table. Burning program The burning program is programmed.

Advantageous effects of the invention

Beneficial effect

[0012] The beneficial effects of the present invention are as follows: According to the invention, the partition table is preset in the PC-side burning program according to the image to be burned into the NANDFLASH, and the bad block distribution in the NANDFLASH is detected by the terminal executing the burning program sent by the PC. Then, according to the distribution of bad blocks, the space occupied by the bad blocks in the area is added in each area in the preset partition table, and a new partition table is set to guide the subsequent image burning process and system operation of each partition; Avoid some terminal terminals brought by fixed partition table can not be used or NANDFLASH space The problem of decreasing usage rate not only ensures the quality of production, but also improves the utilization of storage space, and controls the cost.

DRAWINGS

1 is a flow chart showing the steps of a method for programming a NANDFLASH production stage according to an embodiment of the present invention;

2 is a block diagram showing a module for a programming method of a NANDFLASH production stage according to an embodiment of the present invention.

detailed description

[0015] The most critical idea of the present invention is: according to the distribution of bad blocks, the space occupied by the bad blocks of the area is added in each area in the preset partition table, and a new partition table is set to guide the mirroring of the subsequent partitions. Into the process and system operation.

Referring to FIG. 1 and FIG. 2, the present invention provides a method for programming a NANDFLASH production stage, which includes the following steps:

[0017] SI: the PC-side burning program sends the terminal burning program to the NANDFLASH of the terminal;

[0018] S2: the terminal burning program detects a bad block distribution in the NANDFLASH, and sends the bad block distribution to a PC end burning program;

[0019] S3: the PC-side burning program according to the received bad block distribution and the preset first partition table, the first partition table describes the size of the area that each partition actually needs to use; Area size

, thereby generating a second partition table for this partition;

[0020] S4: The PC-side burning program sequentially writes a mirror of each partition in the NANDFLASH of the terminal according to the second partition table. Burning program

[0021] In the above-mentioned programming method for the NANDFLASH production stage, the partition table is preset in the PC-side burning program according to the image to be burned into the NANDFLASH, and the burning program program sent by the PC is detected by the terminal to detect the NANDFLASH. Bad block distribution, according to the distribution of bad blocks, the space occupied by the bad blocks in the area is added to each area in the preset partition table, and a new partition table is set to guide the subsequent image burning process and system operation of each partition; This way, some terminals that are brought by the fixed partition table are not used or NANDF is avoided. The problem of reduced LASH space utilization not only ensures the quality of production, but also improves the utilization of storage space and controls the cost.

[0022] Further, in the step S1, the PC-side burning program runs under the Linux operating system.

[0023] Linux is an operating system that releases source code. In addition to Kernel free, many of its system programs are free software and are available for free from the Internet.

[0024] Further, in the step S4, the PC-side burning program adds the second partition table to the Uboot environment variable partition to generate a partition mirror and writes the NANDFLASH of the terminal.

[0025] Uboot is the abbreviation of Universal Boot Loader. It is a source code project that complies with the GPL. Its source directory and compiled form are similar to the Linux kernel. Many Uboot source code is simplified according to the corresponding Linu X kernel source. Formed, Uboot is a small program executed before the operating system runs. It initializes the hardware device and establishes an appropriate hardware and software environment to prepare for the final call of the operating system kernel.

[0026] Further, in the step S1, the PC end connects the terminal through the USB, and sends the terminal burning program to the NANDFLASH of the terminal.

[0027] The USB connection mode has the characteristics of being hot-swappable, portable, standard, and capable of connecting multiple devices.

It is widely used for connection between PC and peripheral, and is also suitable for connection between PC and terminal.

[0028] Further, in step S3, the PC-side burning program adds a bad block in the area in each area in the first partition table according to the received bad block distribution and the preset first partition table. The size of the occupied area, calculate the size of the area actually occupied by each partition, and generate a second partition table.

[0029] According to the distribution of bad blocks in the NANDFLASH, the space occupied by the bad blocks is added in the corresponding area of the preset partition table, and the mirroring of each partition can be ensured while ensuring the space utilization of each area is maximized and the cost is saved. Complete burn write to NANDFLASH.

[0030] Further, in the step S4, the mirror of each partition is sequentially written in the NANDFLASH of the terminal, and the terminal is started, and the operating system sequentially loads the corresponding mirror operation according to the second partition table.

[0031] According to the partition table resetted by the NANDFLASH bad block distribution, after the image is written in the NANDFLASH, the terminal is started, and the operating system can successfully load the corresponding image operation, indicating that the image is completely written.

[0032] A programming system for a NANDFLASH production stage, comprising: [0033] sending module: used to send a burning program of the PC end to the NANDFLASH of the terminal;

[0034] detecting module: configured to detect a bad block distribution in the NANDFLASH, and send to the PC end;

[0035] a partition table generation module: configured to calculate, according to the received bad block distribution and the preset first partition table, the size of the area actually occupied by each partition according to the PC-side burning program, thereby generating a Second partition table

[0036] The programming module is configured to sequentially write a mirror of each partition in the NANDFLASH of the terminal according to the second partition table.

[0037] Further, the programming system for the NANDFLASH production stage further includes a PC-side programming program running module, configured to run the PC-side programming program under the Linux operating system.

[0038] Further, the programming system for the NANDFLASH production stage further includes a mirror generation module, configured to generate a partition mirror by adding a second partition table to the Uboot environment variable partition.

[0039] Further, the programming system for the NANDFLASH production stage further includes a mirroring running module, configured to sequentially load the corresponding mirroring operation according to the second partition table in the operating system.

Embodiment 1

[0041] Please refer to FIG. 1, a programming method for the NANDFLASH production stage, including the following steps: [0042] SI: The PC end connects to the terminal through the USB, and the PC end burning program sends the terminal burning program to the NAN of the terminal.

In DFLASH, the PC-side burning program runs under the Linux operating system;

[0043] S2: the terminal burning program detects a bad block distribution in the NANDFLASH, and sends the bad block distribution to

PC end burning program;

[0044] S3: the PC-side burning program adds the size of the area occupied by the bad block in the area in each area in the first partition table according to the received bad block distribution and the preset first partition table, and calculates The size of the area actually occupied by each partition, thereby generating a second partition table;

[0045] S4: The PC-side burning program divides the second partition table into a Uboot environment variable partition, generates a partition mirror, and writes the NANDFLASH of the terminal; sequentially writes a mirror of each partition in the NANDFLASH of the terminal, and then starts The terminal, the operating system sequentially loads the corresponding mirror operation according to the second partition table.

[0046] Referring to FIG. 2, a programming system for a NANDFLASH production stage includes:

[0047] sending module: used to send a burning program of the PC end to the NANDFLASH of the terminal;

[0048] detecting module: configured to detect a bad block distribution in the NANDFLASH, and send to the PC end; [0049] a partition table generating module: configured to calculate, according to the received bad block distribution and the preset first partition table, the size of the area actually occupied by each partition according to the PC-side burning program, thereby generating a Two partition table.

[0050] In summary, the method for programming a NANDFLASH production stage provided by the present invention pre-sets a partition table in a PC-side burning program according to a mirror that needs to be burned into the NANDFLASH, and performs a PC-side transmission through the terminal. The burning program detects the distribution of bad blocks in NANDFLASH, and then adds the space occupied by the bad blocks in the area in the preset partition table according to the distribution of bad blocks, and sets a new partition table for guiding subsequent partition mirrors. The burning process and the system operation; this way avoids the problem that some terminals caused by the fixed partition table cannot be used or the NANDFLASH space utilization rate is reduced, which not only ensures the production quality, but also improves the utilization of the storage space and controls the cost.

[0051] Linux is an open source operating system. In addition to Kernel free, many of its system programs are free software and are available for free from the Internet.

[0052] Uboot is the abbreviation of Universal Boot Loader. It is a source code project that complies with the GPL. Its source directory and compiled form are similar to the Linux kernel. Many Uboot source code is simplified according to the corresponding Linu X kernel source. Formed, Uboot is a small program executed before the operating system runs. It initializes the hardware device and establishes an appropriate hardware and software environment to prepare for the final call of the operating system kernel.

[0053] The USB connection mode has the characteristics of being hot-swappable, portable, standard, and capable of connecting multiple devices.

[0054] According to the distribution of bad blocks in the NANDFLASH, the space occupied by the bad blocks is added in the corresponding area of the preset partition table, and the mirroring of each partition can be ensured in the same space to ensure the space utilization of each area and the cost saving. Complete burn write to NANDFLASH.

[0055] According to the partition table resetted by the NANDFLASH bad block distribution, after the image is written in the NANDFLASH, the terminal is started, and the operating system can successfully load the corresponding image operation, indicating that the image is completely written.

[0056]

Claims

Claim

[Claim 1] A method for programming a NANDFLASH production stage, comprising the steps of:

SI: the PC-side burning program sends the terminal burning program to the NANDFLASH of the terminal; S2: the terminal burning program detects the bad block distribution in the NANDFLASH, and sends the bad block distribution to the PC-side burning program;

S3: The PC-side burning program according to the received bad block distribution and the preset first partition table, the first partition table describes the size of the area actually needed for each partition; and calculates the size of the area actually occupied by each partition, Thereby generating a second partition table for this partition;

S4: The PC-side burning program sequentially burns the image of each partition in the NANDFLASH of the terminal according to the second partition table.

[Claim 2] The programming method for the NANDFLASH production stage according to claim 1, wherein the PC-side burning program in the step S1 is run under the Linux operating system.

[Claim 3] The method for programming a NANDFLASH production stage according to claim 1, wherein in the step S4, the PC-side burning program divides the second partition table by adding a Uboot environment variable partition to generate a partition. Mirror, and write to the terminal's NANDFLASH.

[Claim 4] The programming method for the NANDFLASH production stage according to claim 1, wherein in the step S1, the PC end is connected to the NANDFLASH of the terminal burning program SJ terminal through the USB connection terminal.

[Claim 5] The method for programming a NANDFLASH production stage according to claim 1, wherein the PC-side burning program in the step S3 is based on the received bad block distribution and the preset first partition. The table adds the size of the area occupied by the bad block in the area in the first partition table, and calculates the size of the area actually occupied by each partition, thereby generating a second partition table.

[Claim 6] The method for programming a NANDFLASH production stage according to claim 1, wherein in the step S4, the mirror of each partition is sequentially written in the NANDFLASH of the terminal, and the terminal is started. The operating system loads the corresponding image run in turn according to the second partition table.

[Claim 7] A programming system for a NANDFLASH production stage, comprising: Transmitting module: used for transmitting the terminal burning program to the NANDFLASH of the terminal; detecting module: for detecting the bad block distribution in the NANDFLASH and transmitting to the PC end; the partition table generating module: for using the PC-based burning program according to the program Receiving the bad block distribution and the preset first partition table, calculating the size of the area actually occupied by each partition, thereby generating a second partition table for the partition;

The programming module is configured to sequentially write a mirror of each partition in the NANDFLASH of the terminal according to the second partition table.

The programming system for a NANDFLASH production stage according to claim 7, further comprising a PC-side programming program running module for operating the PC-side programming program under a Linux operating system.

The programming system for a NANDFLASH production stage according to claim 7, further comprising: a mirror generation module, configured to generate a partition mirror by adding a second partition table to the Uboot environment variable partition.

The programming system for the NANDFLASH production stage of claim 7, further comprising a mirroring running module for sequentially loading the corresponding mirroring operation in the operating system according to the second partitioning table.