DDR3L is not working at above 800 MT/s with T1040

[gouravjain]

Hi guys,

My custom board which is based on T1040RDB, has DDR3L module MT4KTF25664HZ-1G6E1. This DDR is wroking properly at clock 400  MHz (800 MT/s data rate) while giving error once the clock goes above 400 MHz. ideally DDR should work upto 1600 MT/s.

DDR at 400 MHz:

U-Boot 2014.07 (May 16 2016 - 10:14:12)

CPU0:  T1040E, Version: 1.1, (0x85280011)

Core:  e5500, Version: 2.1, (0x80241021)

Clock Configuration:

       CPU0:1400 MHz, CPU1:1400 MHz, CPU2:1400 MHz, CPU3:1400 MHz,

       CCB:600  MHz,

       DDR:400  MHz (800 MT/s data rate) (Asynchronous), IFC:150  MHz

       QE:300  MHz

       FMAN1: 600 MHz

       QMAN:  300 MHz

       PME:   300 MHz

L1:    D-cache 32 KiB enabled

       I-cache 32 KiB enabled

Reset Configuration Word (RCW):

       00000000: 0c0c000e 0e000000 00000000 00000000

       00000010: 69000000 80000002 ec027000 21000000

       00000020: 00000000 00000000 00000000 00032000

       00000030: 00000000 00025a8f 00000000 00000000

Board: T1040-GCR

I2C:   ready

SPI:   ready

DRAM:  Initializing....using SPD

Detected UDIMM 4KTF25664HZ-1G6E1

GGG-Found timing match: n_ranks 1, data rate 833, rank_gb 0

        clk_adjust 4, wrlvl_start 6, wrlvl_ctrl_2 0x6060607, wrlvl_ctrl_3 0x8080807

2 GiB (DDR3, 64-bit, CL=6, ECC off)

Flash: 256 MiB

L2:    256 KiB enabled

Corenet Platform Cache: 256 KiB enabled

Using SERDES1 Protocol: 105 (0x69)

NAND:  0 MiB

MMC:   FSL_SDHC: 0

*** Warning - bad CRC, using default environment

DDR at above 400 MHz:

U-Boot 2014.07 (May 16 2016 - 10:14:12)

CPU0:  T1040E, Version: 1.1, (0x85280011)

Core:  e5500, Version: 2.1, (0x80241021)

Clock Configuration:

       CPU0:1400 MHz, CPU1:1400 MHz, CPU2:1400 MHz, CPU3:1400 MHz,

       CCB:600  MHz,

       DDR:533.333 MHz (1066.667 MT/s data rate) (Asynchronous), IFC:150  MHz

       QE:300  MHz

       FMAN1: 600 MHz

       QMAN:  300 MHz

       PME:   300 MHz

L1:    D-cache 32 KiB enabled

       I-cache 32 KiB enabled

Reset Configuration Word (RCW):

       00000000: 0c10000e 0e000000 00000000 00000000

       00000010: 69000000 80000002 ec027000 21000000

       00000020: 00000000 00000000 00000000 00032000

       00000030: 00000000 00025a8f 00000000 00000000

Board: T1040-GCR

I2C:   ready

SPI:   ready

DRAM:  Initializing....using SPD

Detected UDIMM 4KTF25664HZ-1G6E1

GCR-Found timing match: n_ranks 1, data rate 1350, rank_gb 0

        clk_adjust 4, wrlvl_start 7, wrlvl_ctrl_2 0x708080a, wrlvl_ctrl_3 0xa0b0c09

Waiting for D_INIT timeout. Memory may not work. (its stucking here).

pls  let me know where i need to debug??

--

Gourav

[Bulat]

I guess that you used setup of the t104xrdb board. If so, this could create a problem due to different DIMM types. T1040RDB uses regular DIMM size, while you use SODIMM. Try to insert following changes into t104xrdb\ddr.h file.

Original:

...

     {1,  833,  4, 4, 6, 0x06060607, 0x08080807}  

     {1,  833,  0, 4, 6, 0x06060607, 0x08080807}, 

     {1,  1350, 4, 4,7, 0x0708080A, 0x0A0B0C09}, 

     {1,  1350, 0, 4,7, 0x0708080A, 0x0A0B0C09},

     {1,  1666, 4, 4,7, 0x0808090B, 0x0C0D0E0A},  

     {1,  1666, 0, 4,7, 0x0808090B, 0x0C0D0E0A},

...

New:

...

     {1,  833,  4, 4,6, 0x06060607, 0x07080800},   

     {1,  833,  0, 4,6, 0x06060607, 0x07080800},  

     {1,  1350, 4, 4,7, 0x07070708, 0x08080800},    ]

     {1,  1350, 0, 4,7, 0x07070708, 0x08080800},  

     {1,  1666, 4, 4,7, 0x07080809, 0x090A0A00},   

     {1,  1666, 0, 4,7, 0x07080809, 0x090A0A00},

...

Regards,

Bulat

[gouravjain]

Hi Bulat,

It worked !!!! thanks alot for your help. But i could not get this value any where even i tried DDR validation tool also and it gave me some other values ..can you pls tell me from where you got it ???

regards,

Gourav

[Bulat]

Good news!.

Those values are result of my calculations/estimations based on existing ones, taking into account difference in sizes/topologies between UDIMM/SODIMM.

I believe the validation tool can provide better results because it directly tests different values.

Regards,

Bulat