CN107122279A

CN107122279A - A kind of method by U Boot fast debugging DDR memory grains

Info

Publication number: CN107122279A
Application number: CN201710427214.0A
Authority: CN
Inventors: 卞西晗; 张连聘; 张雁鹏
Original assignee: Jinan Inspur Hi Tech Investment and Development Co Ltd
Current assignee: Jinan Inspur Hi Tech Investment and Development Co Ltd
Priority date: 2017-06-08
Filing date: 2017-06-08
Publication date: 2017-09-01

Abstract

The present invention discloses a kind of method by U Boot fast debugging DDR memory grains, is related to the correlative technology field of internal memory debugging；DDR initialization section codes in U BOOT are modified, the DDR in U BOOT is set to obtain SPD information part, the SPD arrays write are covered to the save location for being substituted into SPD data in the EEPROM read by I2C pointed by spd pointers, without carrying out programming to EEPROM every time, to accelerate debugging speed.

Description

A kind of method by U-Boot fast debugging DDR memory grains

Technical field

The present invention discloses a kind of method by U-Boot fast debugging DDR memory grains, is related to the correlation of internal memory debugging Technical field.

Background technology

DDR is Double Data Rate synchronous DRAM.Strictly speaking DDR should be DDR SDRAM, and people's custom claims It is the memory of synchronous dynamic random-access for DDR.DDR internal memories are developed on the basis of sdram memory, still edge SDRAM production systems are used, therefore for internal memory manufacturer, only the equipment for manufacturing common SDRAM need to slightly be improved, you can real The production of existing DDR internal memories, can effectively reduce cost.

U-Boot, full name Universal Boot Loader, are the open source code projects based on GPL clauses, under being GPL Most complete one general Boot Loader of resource language；Carry out what DDR internal memory pasters particle was debugged by U-Boot at present Method is mainly debugged again by writing parameter and being calculated, and this method needs to be counted by contrasting data handbook Calculate, easily there is error and slow, it is impossible to intuitively debugged, in the SPD data for needing to meet JEDEC standard without Method directly carries out parameter adjustment by JEDEC.

The present invention provides a kind of method by U-Boot fast debugging DDR memory grains, and DDR in U-BOOT is initialized Partial code is improved, and when obtaining SPD information, the SPD arrays write using commissioning staff are replaced program and sought by I2C The EEPROM looked in board obtains SPD information, the method that SPD information is read by I2C is replaced with into SPD arrays, it is therefore an objective to be Raising debugging speed in the debugging U-BOOT that can realize quicklook meets JEDEC standard there is provided intuitively parameter adjustment SPD data.

The content of the invention

The present invention is effectively raised new for providing a kind of method by U-Boot fast debugging DDR memory grains The difficulty of board initial stage of development DDR internal memory pasters particle debugging, accelerates debugging speed.

Concrete scheme proposed by the present invention is：

A kind of method by U-Boot fast debugging DDR memory grains：

DDR initialization sections code in U-BOOT is modified, the DDR in U-BOOT is obtained SPD information part, The SPD arrays write are covered to the preservation position for being substituted into SPD data in the EEPROM read by I2C pointed by spd pointers Put, without carrying out programming to EEPROM every time, to accelerate debugging speed.

The SPD data used in SPD arrays is the SPD data for meeting JEDEC standard, if not meet JEDEC marks Accurate SPD data then writes SPD data again according to standard, and changes overlay length as needed.

The function of reading the SPD data in EEPROM in U-BOOT by I2C is deleted, and adds delay udelay to meet Timing requirements during driving.

In the U-BOOT DDR initialization U-BOOT /driver/ddr/main.c in get_spd positions.

The SPD arrays write are covered by memcpy and are substituted into being read by I2C pointed by spd pointers The save location of SPD data.

Usefulness of the present invention is：

The present invention provides a kind of method by U-Boot fast debugging DDR memory grains：

DDR initialization sections code in U-BOOT is modified, the DDR in U-BOOT is obtained SPD information part, The SPD arrays write are covered to the preservation position for being substituted into SPD data in the EEPROM read by I2C pointed by spd pointers Put；The SPD data according to JEDEC standard editor, and number can directly be used by carrying out DDR initialization debugging by the inventive method According to being array formats, without transcoding, significantly simplify debugging flow, allow commissioning staff directly adjust SPD numerical value without Programming work is carried out to EEPROM every time, debugging speed is accelerated.

Brief description of the drawings

Fig. 1 the inventive method schematic flow sheets.

Embodiment

With reference to accompanying drawing, the present invention will be further described.

Using the inventive method, U-BOOT /driver/ddr/main.c in get_spd positions, ret is forced 0 is set to, SPD data is saved into array in the form of 16 system arrays, the SPD arrays as write,

The array is covered into the preservation position by the I2C SPD datas read pointed by spd pointers by memcpy again Put, with reference to following example code：

In above method application, in order to tackle timing requirements, it can delete in U-BOOT by I2C readings EEPROM The function of SPD data, and add delay udelay to meet timing requirements during driving；

Meanwhile, the SPD data used in array is the SPD data for meeting JEDEC standard, if not meet JEDEC standard SPD data can then write SPD data again according to relevant criterion, and change overlay length as needed.

It directly can be write to initialize with DDR using SPD data using the inventive method and be debugged, being capable of simple, intuitive Adjustment data, while the inventive method is without using the SPD data in the EEPROM obtained by I2C, the nothing in debugging process Programming EEPROM repeatedly is needed, debug time and cost is significantly saved.

Claims

1. a kind of method by U-Boot fast debugging DDR memory grains, it is characterized in that

DDR initialization sections code in U-BOOT is modified, the DDR in U-BOOT is obtained SPD information part, will compile The SPD arrays covering write is substituted into the save location of SPD data in the EEPROM read by I2C pointed by spd pointers, with Just without carrying out programming to EEPROM every time, debugging speed is accelerated.

2. according to the method described in claim 1, it is characterized in that the SPD data used in SPD arrays is to meet JEDEC The SPD data of standard, if not the SPD data for meeting JEDEC standard then writes SPD data again according to standard, and as needed Change overlay length.

3. method according to claim 1 or 2, it is characterized in that deleting in U-BOOT by the SPD in I2C readings EEPROM The function of data, and add delay udelay to meet timing requirements during driving.

4. method according to claim 3, it is characterized in that in the U-BOOT DDR initialization U-BOOT /driver/ Get_spd positions in ddr/main.c.

5. method according to claim 4, it is characterized in that the SPD arrays write are substituted into by memcpy coverings The save location by the I2C SPD datas read pointed by spd pointers.