- Attention
- Please note that this driver is supported only on DM R5(WKUP R5) as part SBL examples. It is not supported on MCU-R5.
The DDR driver provides API to configure the DDR module.
Features Supported
- Ability to enable/disable DDR support in your application
- Ability to specify the DDR config generated using the "DDR SUBSYSTEM REGISTER CONFIGURATION" tool
- Ability to enable/disable inline ECC (1b and 2b) in the application
- Add regions for enabling inline ECC
SysConfig Features
- Note
- It is strongly recommend to use SysConfig where it is available instead of using direct SW API calls. This will help simplify the SW application and also catch common mistakes early in the development cycle.
- Ability to specify the DDR config generated using the "DDR SUBSYSTEM REGISTER CONFIGURATION" tool
- Enables DDR, EMIF module clock when DDR module is selected
- Toggle inline ECC functionality
- Add regions for which inline ECC needs to be enabled
Features not Supported
NA
Creating your own DDR config file
Step 1: Generate a DDR config file for your EVM
- Goto https://dev.ti.com/sysconfig
- Select "Software Product" as "DDR SUBSYSTEM REGISTER CONFIGURATION"
- Select "Device" of interest, AM62AX in this case.
DDR SUBSYSTEM REGISTER CONFIGURATION Tool
- Configure the DDR parameters using the tool
- Save the generated
board_ddrReginit.h in your project workspace or work area
Configure and save the generated file
Step 2: Add the generated DDR config file to your project
Add DDR via SysConfig
- Specify the path to the generated
board_ddrReginit.h file including the filename in the sysconfig text box as shown above
- Make sure to use forward slash "/" in the file path so that this will work with linux as well as windows build
- Make sure that path to this is file set in your application include path, as needed.
- Save the sysconfig project and build your application
Creating your own LPDDR config file
Step 1: Generate a LPDDR config file for your EVM
- Goto https://dev.ti.com/sysconfig
- Select "Software Product" as "DDR SUBSYSTEM REGISTER CONFIGURATION"
- Select "Device" of interest, AM62AX in this case.
DDR SUBSYSTEM REGISTER CONFIGURATION Tool
- Configure the LPDDR parameters using the tool
- Save the generated
board_ddrReginit.h in your project workspace or work area. Rename the file as "board_lpddrReginit.h".
Configure and save the generated file
Step 2: Add the generated LPDDR config file to your project
Add DDR via SysConfig
- Specify the path to the generated
board_lpddrReginit.h file including the filename in the sysconfig text box as shown above
- Make sure to use forward slash "/" in the file path so that this will work with linux as well as windows build
- Make sure that path to this is file set in your application include path, as needed.
- Save the sysconfig project and build your application
Enabling DDR inline ECC
Step 1: Enable inline ECC in the SBL sysconfig
Enable inline ECC via SysConfig
- Add regions for which inline ECC needs to be enabled
- Save the sysconfig project and build your application
Step 2: Generate linux appimage and u-boot.img
- If SBL is booting linux, 1/9th of DDR has to be reserved in the device tree for storing ECC values
- For u-boot flow,
- Reduce the "DDR memory" to 8/9th of whole DDR size in u-boot device tree by modifying the device tree board file (arch/arm/dts/k3-am62a7-sk.dts)
- Rebuild a53 spl and u-boot.img with this change. Instructions to build A53 uboot can be found in the SDK Linux documentation at Foundational Components » U-Boot » User’s Guide » General Information » Build U-Boot
- Generate the linux.appimage using the updated A53 SPL
- Refer Linux Appimage Generator Tool for more details
- Flash the linux.appimage and u-boot.img
- For Falcon mode (fast bootmode),
- Reduce the "DDR memory" to 8/9th of whole DDR size in linux device tree by modifying the device tree board file (arch/arm64/boot/dts/ti/k3-am62a7-sk.dts)
- Rebuild the linux devicetree blob (dtb). For more information, refer the Linux SDK docs, section Foundational Components > Kernel > Users Guide
- Generate the linux.appimage using the updated dtb file
- Refer Linux Appimage Generator Tool for more details
- Flash the linux.appimage
Important Usage Guidelines
- Ideally DDR should be enabled in the bootloader application and the SDK bootloader by default enables DDR by default.
Usage Overview
Include the below file to access the APIs
#include <stdio.h>
#include "drivers/ddr/v0/soc/am64x_am243x/board_ddrReginit.h"
{
.clk2Freq = DDRSS_PLL_FREQUENCY_2,
.ddrssCtlReg = DDRSS_ctlReg,
.ddrssPhyIndepReg = DDRSS_phyIndepReg,
.ddrssPhyReg = DDRSS_phyReg,
.ddrssCtlRegNum = DDRSS_ctlRegNum,
.ddrssPhyIndepRegNum = DDRSS_phyIndepRegNum,
.ddrssPhyRegNum = DDRSS_phyRegNum,
.ddrssCtlRegCount = DDRSS_CTL_REG_INIT_COUNT,
.ddrssPhyIndepRegCount = DDRSS_PHY_INDEP_REG_INIT_COUNT,
.ddrssPhyRegCount = DDRSS_PHY_REG_INIT_COUNT,
.fshcount = DDRSS_PLL_FHS_CNT,
.enableEccFlag = 0,
.eccRegion = NULL,
};
Initialize DDR
Example Usage
NA
API
APIs for DDR
1.8.20