CN113312273A - NAND FLASH-based serial number and MAC address storage method - Google Patents
NAND FLASH-based serial number and MAC address storage method Download PDFInfo
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- CN113312273A CN113312273A CN202010118402.7A CN202010118402A CN113312273A CN 113312273 A CN113312273 A CN 113312273A CN 202010118402 A CN202010118402 A CN 202010118402A CN 113312273 A CN113312273 A CN 113312273A
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- serial number
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
- G06F12/0246—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory in block erasable memory, e.g. flash memory
Abstract
The invention provides a NAND FLASH-based serial number and MAC address storage method, which comprises the following steps: s1, storing the sequence number and MAC address area in the last partition reserved portion of NAND FLASH; s2, marking a bad block when the erasing sequence number and the MAC address area meet the bad block, and finding the next good block position to store data; s3, setting the sequence number and MAC address area as invisible MTD management layer; s4, the serial number and MAC address area must be read and written through a designated interface. The method of the invention overcomes the problems in the prior art, and can not increase additional circuits and chips and occupy the limited EFUSE space.
Description
Technical Field
The invention relates to the technical field of storage, in particular to a serial number and MAC address storage method based on NAND FLASH.
Background
With the continuous development of science and technology, particularly NAND FLASH technology is developed. In the prior art, in order to better manage operations such as upgrading of each device program and user authentication, a product manufacturer needs to verify the legal identity of a product and writes a serial number and a MAC address into a designated partition of an EEPROM, an EFUSE or a FLASH. Dividing FLASH into a plurality of partitions, which basically comprise a bootstrap partition, a kernel partition, a file system partition, a serial number partition, a MAC address partition and the like.
The defects in the prior art are as follows:
1. the EEPROM requires additional circuits and chips, which additionally increases the product cost.
2. EFUSE can only be written once, cannot be modified, and has limited space.
3. The sequence number and MAC address partitions need to be rewritten when erasing FLASH completely.
4. There is no protection and verification mechanism for data reading and writing.
Common terms in the prior art include:
an EEPROM: electrically Erasable Programmable ROM.
EFUSE: similar to EEPROM, belongs to one-time programmable memories.
NAND FLASH: a nonvolatile memory in which power-off data is not lost.
BLOCK (BLOCK): NAND FLASH units of erase operations, typically 128KB in size, contain 64 pages of 2 KB.
And (3) bad block: this indicates that an erase/write disabled region is present at NAND FLASH.
MTD: memory Technology Device, i.e. Memory Technology Device, provides a unified interface for NOR FLASH and NAND FLASH devices in MTD layer in Linux kernel. The MTD isolates the file system from the underlying FLASH memory.
Sequence Number (SN): abbreviation for Serial Number. The serial number is an identifier of a group of numbers and character combinations, generally contains information such as a product model number, a version number, a manufacturer, a date, a serial number and the like, and has uniqueness.
MAC address: the Medium/Media Access Control address is translated into a Media Access Control address, also called a hardware address physical address. With a hexadecimal number, a total of six bytes of identifier indicate a site location on the network. Has global uniqueness.
Disclosure of Invention
In order to solve the above problems, the present invention is directed to: the simple method overcomes the problems in the prior art, does not need to add extra circuits and chips, and does not occupy the limited EFUSE space.
Specifically, the invention provides a NAND FLASH-based serial number and MAC address storage method, which comprises the following steps:
s1, storing the sequence number and MAC address area in the last partition reserved portion of NAND FLASH;
s2, marking a bad block when the erasing sequence number and the MAC address area meet the bad block, and finding the next good block position to store data;
s3, setting the sequence number and MAC address area as invisible MTD management layer;
s4, the serial number and MAC address area must be read and written through a designated interface.
In step S3, the setting of the sequence number and the MAC address area as invisible to the MTD management layer is implemented by subtracting the size of the reserved portion from the FLASH memory space obtained on the MTD management layer.
The step S2 further includes:
s2.1, starting the MAC address corresponding to the Nth block, and respectively storing the MAC address length and the MAC address data according to the MAC size;
s2.2, when erasing and writing are carried out on the Z-th block, and the Z-th block is found to be a bad block, marking the Z-th block as a bad block;
and S2.3, continuing to store from the Z +1 th block, and respectively storing the length of the serial number and the serial number data according to the size of the serial number.
Thus, the present application has the advantages that: by the method:
1. the modification is convenient, and the safety is compatible.
2. When the FLASH is completely erased, the sequence number and the MAC address storage area are not influenced.
3. Convenient operation and high production efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic flow diagram of the process of the present invention.
FIG. 2 is a schematic block diagram of the method of the present invention.
Detailed Description
In order that the technical contents and advantages of the present invention can be more clearly understood, the present invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention relates to a NAND FLASH-based serial number and MAC address storage method, which comprises the following steps:
s1, storing the sequence number and MAC address area in the last partition reserved portion of NAND FLASH;
s2, marking a bad block when the erasing sequence number and the MAC address area meet the bad block, and finding the next good block position to store data;
s3, setting the sequence number and MAC address area as invisible MTD management layer;
s4, the serial number and MAC address area must be read and written through a designated interface.
The reserved portion is larger than the sum of the sequence number and the MAC address size.
The reserved part is 2M space, i.e. 8 blocks.
In step S3, the setting of the sequence number and the MAC address area as invisible to the MTD management layer is implemented by subtracting the size of the reserved portion from the FLASH memory space obtained on the MTD management layer.
And the application program and the burning tool read and write the serial number and the MAC address area through a specified interface.
When the FLASH is completely erased, the sequence number and the MAC address storage area are not influenced.
The step S2 further includes:
s2.1, starting the MAC address corresponding to the Nth block, and respectively storing the MAC address length and the MAC address data according to the MAC size;
s2.2, when erasing and writing are carried out on the Z-th block, and the Z-th block is found to be a bad block, marking the Z-th block as a bad block;
and S2.3, continuing to store from the Z +1 th block, and respectively storing the length of the serial number and the serial number data according to the size of the serial number.
The invention may be further explained by the last partition of space at NAND FLASH storing the sequence number and MAC address. Since NAND FLASH process characteristics cannot guarantee that all storage areas are good blocks, 2M space (8 blocks) is reserved for the sequence number and MAC address storage areas, and when the sequence number and MAC address areas are erased and written, bad blocks are marked and the next good block position is found to store data.
As shown in fig. 2, the FLASH memory space obtained on the MTD management layer is reduced by 2MB, that is, the memory area for the serial number and the MAC address is not visible, and the application program and the burning tool must read and write the area through the designated interface.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An NAND FLASH-based serial number and MAC address storage method, characterized by comprising the following steps:
s1, storing the sequence number and MAC address area in the last partition reserved portion of NAND FLASH;
s2, marking a bad block when the erasing sequence number and the MAC address area meet the bad block, and finding the next good block position to store data;
s3, setting the sequence number and MAC address area as invisible MTD management layer;
s4, the serial number and MAC address area must be read and written through a designated interface.
2. The NAND FLASH-based sequence number and MAC address storage method according to claim 1, wherein the reserved portion is larger than the sum of the sequence number and the MAC address size.
3. NAND FLASH-based sequence number and MAC address storage method according to claim 2, wherein the reserved portion is 2M space, i.e. 8 blocks.
4. The NAND FLASH-based serial number and MAC address storage method according to claim 1, wherein the step S3, the setting of the serial number and MAC address area as invisible to the MTD management layer is implemented by subtracting the size of the reserved portion from the FLASH memory space obtained on the MTD management layer.
5. The NAND FLASH-based serial number and MAC address storage method according to claim 1, wherein the application and burning tool reads and writes the serial number and MAC address area through a designated interface.
6. The NAND FLASH-based serial number and MAC address storage method according to claim 1, wherein FLASH is erased fully without affecting serial number and MAC address storage areas.
7. The NAND FLASH-based serial number and MAC address storage method according to claim 1, wherein the step S2 further comprises:
s2.1, starting the MAC address corresponding to the Nth block, and respectively storing the MAC address length and the MAC address data according to the MAC size;
s2.2, when erasing and writing are carried out on the Z-th block, and the Z-th block is found to be a bad block, marking the Z-th block as a bad block;
and S2.3, continuing to store from the Z +1 th block, and respectively storing the length of the serial number and the serial number data according to the size of the serial number.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010118402.7A CN113312273A (en) | 2020-02-26 | 2020-02-26 | NAND FLASH-based serial number and MAC address storage method |
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| CN202010118402.7A CN113312273A (en) | 2020-02-26 | 2020-02-26 | NAND FLASH-based serial number and MAC address storage method |
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| CN104094214A (en) * | 2012-01-31 | 2014-10-08 | 京瓷办公信息系统株式会社 | Mounting method in electronic device |
| CN106126113A (en) * | 2016-06-14 | 2016-11-16 | 烽火通信科技股份有限公司 | A kind of method of home gateway service data classification storage management |
| CN106445398A (en) * | 2015-08-04 | 2017-02-22 | 深圳市中兴微电子技术有限公司 | Novel memory-based embedded file system and realization method thereof |
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2020
- 2020-02-26 CN CN202010118402.7A patent/CN113312273A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104094214A (en) * | 2012-01-31 | 2014-10-08 | 京瓷办公信息系统株式会社 | Mounting method in electronic device |
| CN106445398A (en) * | 2015-08-04 | 2017-02-22 | 深圳市中兴微电子技术有限公司 | Novel memory-based embedded file system and realization method thereof |
| CN106126113A (en) * | 2016-06-14 | 2016-11-16 | 烽火通信科技股份有限公司 | A kind of method of home gateway service data classification storage management |
Non-Patent Citations (1)
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| 黄健著: "《嵌入式Linux系统 开发原理与实战,》", 北京理工大学出版社 * |
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