TMS320DM8168: UBOOT DDR3 Configurations

Faiz Ahmed77

Part Number: TMS320DM8168

Dear Sir/Mam,

We are using TMS320DM1868 IC interfaced to 4 Nos of DDR3-SDRAM each of size 256MB, All the DDR3 are interfaced to EMIF0 and EMIF1 is left open, The total of memory physically interfaces is 1GB, But in Uboot prints it was showing 2GB,

Uboot was modified as:

in file include/config/ti8168_evm.h

#define CONFIG_NR_DRAM_BANKS was set to 2

#define PHYS_DRAM_1 is set to 0x80000000

#define PHYS_DRAM_1_SIZE is set to 0x40000000

#define PHYS_DRAM_2 is set to 0xc0000000

#define PHYS_DRAM_2_SIZE is set to 0x00000000

in file arch/arm/include/asm/arch-ti81xx/ddr_defs_ti816x.h

#define USE_EMIF1 is set to 0

When booted with the above configured, modified U-BOOT it shows 1GB as DDR RAM SIZE.

In view of above , Do we have to modify the LISA registers too as shown in wiki link of EZSDK.

or are the carried out changes sufficient ?

Regards

Faiz Ahmed.

over 6 years ago

0 Pavel Botev over 6 years ago

TI__Guru**** 170625 points

Hi Faiz,

The 2GB value is hardcoded. Without memory size detection in place this has been left to max for now. This has been fixed will below u-boot patch:

Check also below e2e post:

Regards,
Pavel

0 Faiz Ahmed77 over 6 years ago in reply to Pavel Botev

Prodigy 80 points

Dear Pavel,

Thanks for quick reply,

In our custom board, 1GB RAM is connected to EMIF0 and EMIF1 is not used (left open).

Kindly let me know where I should change the uboot RAM setting in source code.

Do I have to change:

CONFIG_NR_DRAM_BANKS

PHYS_DRAM_1

PHY_DRAM_1_SIZE

PHY_DRAM_2

PHY_DRAM_2_SIZE

what value should i write in

DMM_LISA_MAP__0/1/2/3

USE_EMIF1 should be set to 0 ?

Regards

Faiz Ahmed

0 Pavel Botev over 6 years ago in reply to Faiz Ahmed77

TI__Guru**** 170625 points

Hi Faiz,

For using EMIF0 only, we have good info in below pointers:

Regards,
Pavel

0 Faiz Ahmed77 over 6 years ago in reply to Pavel Botev

Prodigy 80 points

Dear Pavel,

Thanks for the above pointers, we are looking into it and modifying u-boot and testing,

I have attached two logs of kernel panics,Kindly provide me feedback for the reason for such a panic, It occurs randomly when system runs for more than 1 day.

Is it related to memory mapping in U-BOOT or other kernel and driver issues ?

Regards

Faiz Ahmed

2845.kernelPanic_16Sept2019_2.txt kernelPanicAfteerUboot_20Sep2019.txt

0 Pavel Botev over 5 years ago in reply to Faiz Ahmed77

TI__Guru**** 170625 points

Faiz,

What I can suggest you is:

- try to run the same SW on DM816x TI EVM board and see if you will be able to reproduce this issue

- run DDR3 memory stress test, check below pointer for details:

Check also below pointers:

Regards,
Pavel

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TMS320DM8168: UBOOT DDR3 Configurations