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Original question:

Linux/AM3352: DDR configuration in Processor SDK

Linux/AM3352: am3358 DDR3 K4B2G1646F Error Power On

df df
Prodigy 10 points
Part Number: AM3352

Tool/software: Linux

Hi Sir,

My customer built a custom am3358 board and designed in Samsung K4B2G1646F-BMK0 DDR3-DRAM.

I'm following the procedure as processors.wiki.ti.com/.../AM335x_DDR_PHY_register_configuration_for_DDR3_using_Software_Leveling

I have completed the DDR3 software leveling and got the OPTIMUM numbers, and have tested DDR3 by "AM335x DDR3 Tests"  Function.

My DDR3 Config

#define CMD_PHY_CTRL_SLAVE_RATIO            (0x80)
#define CMD_PHY_INVERT_CLKOUT                 (0x00)

#define DATA_PHY_RD_DQS_SLAVE_RATIO        0x39
#define DATA_PHY_FIFO_WE_SLAVE_RATIO       0x98 //RD DQS GATE
#define DATA_PHY_WR_DQS_SLAVE_RATIO        0x35
#define DATA_PHY_WR_DATA_SLAVE_RATIO       0x74 //WRITED ATA

#define DDR_IOCTRL_VALUE                               (0x18B)

#define ALLOPP_DDR3_READ_LATENCY               0x000007 //RD_Latency = (CL + 2) - 1

#define ALLOPP_DDR3_SDRAM_TIMING1            0x0AAAD4DB
#define ALLOPP_DDR3_SDRAM_TIMING2            0x26437FDA
#define ALLOPP_DDR3_SDRAM_TIMING3            0x501F83FF

#define ALLOPP_DDR3_SDRAM_CONFIG             0x61C052B2
#define ALLOPP_DDR3_REF_CTRL                      0x00000C30

#define ALLOPP_DDR3_ZQ_CONFIG                    0x50074BE4

But, when I set DDR3 Params to u-boot, then  burn am335x nor flash, I figure out some problems.

1) when powered on,  DDR3 init error,

U-Boot 2016.05 (Dec 24 2018 - 17:51:36 +0800)

initcall: 080155f0
U-Boot code: 08000000 -> 0807D6E8 BSS: -> 080CD51C
initcall: 080153ec
initcall: 08015634
Watchdog enabled
initcall: 08015450
initcall: 08015650
I2C: ready
initcall: 0801561c
DRAM: initcall: 08001834
initcall: 08015450
initcall: 08015450
initcall: 08015450
initcall: 08015890
Monitor len: 000CD51C
Ram size: 00000000
Ram top: 80000000
initcall: 08015414
initcall: 08015598
TLB table from 7fff0000 to 7fff4000
initcall: 080157d4
initcall: 0801554c
Reserving 821k for U-Boot at: 7ff22000
initcall: 0801551c
Reserving 16512k for malloc() at: 7ef02000
initcall: 08015770

2) when reset, DDR3 init success

U-Boot 2016.05 (Dec 24 2018 - 17:51:36 +0800)

initcall: 080155f0
U-Boot code: 08000000 -> 0807D6E8 BSS: -> 080CD51C
initcall: 080153ec
initcall: 08015634
Watchdog enabled
initcall: 08015450
initcall: 08015650
I2C: ready
initcall: 0801561c
DRAM: initcall: 08001834
initcall: 08015450
initcall: 08015450
initcall: 08015450
initcall: 08015890
Monitor len: 000CD51C
Ram size: 10000000
Ram top: 90000000
initcall: 08015414
initcall: 08015598
TLB table from 8fff0000 to 8fff4000
initcall: 080157d4
initcall: 0801554c
Reserving 821k for U-Boot at: 8ff22000
initcall: 0801551c
Reserving 16512k for malloc() at: 8ef02000
initcall: 08015770
Reserving 80 Bytes for Board Info at: 8ef01fb0
initcall: 0801542c
initcall: 080154e8
Reserving 216 Bytes for Global Data at: 8ef01ed8
initcall: 0801547c
initcall: 080157c4
initcall: 0801590c
initcall: 08015868
initcall: 080157e0

RAM Configuration:
Bank #0: 80000000 256 MiB

DRAM: 256 MiB
initcall: 08015460
New Stack Pointer is: 8ef01eb0
initcall: 08015450
initcall: 0801572c
initcall: 080156c0
Relocation Offset is: 87f22000
Relocating to 8ff22000, new gd at 8ef01ed8, sp at 8ef01eb0
initcall: 8ff37b44
initcall: 8ff37984
initcall: 08015b2c (relocated to 8ff37b2c)
dram_bank_mmu_setup: bank: 0

Please give me some ideas.

Regards,

David

  • 0
    TI__Genius 9065 points
    David,

    Due to the US holidays, on this particular E2E thread, our response may get delayed until the week of Jan 2, 2019.

    Warmest Wishes for Happy Holidays and a Happy New Year!

    best regards,
    David Zhou
  • 0 in reply to dzhou
    TI__Genius 9510 points
    You can determine the function called that is setting the DRAM size by correlating the initcall: 08015890 address with the address found in the generated u-boot.sym file. You then will need to understand the condition for why on reset the value is correct vs POR.